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4:1 HDMI/DVI Switch with Equalization AD8191
FEATURES
Four inputs, one output HDMITM/DVI links Four TMDS channels per link Supports 250 Mbps to 1.65 Gbps data rates Supports 25 MHz to 165 MHz pixel clocks Equalized inputs for operation with long HDMI cables (20 meters at 1080p) Fully buffered unidirectional inputs/outputs Globally switchable, 50 on-chip terminations Pre-emphasized outputs Low added jitter Single-supply operation (3.3 V) Four auxiliary channels per link Bidirectional unbuffered inputs/outputs Flexible supply operation (3.3 V to 5 V) HDCP standard compatible Allows switching of DDC bus and two additional signals Multiple channel bundling modes 1x (4:1) HDMI/DVI link switch (default) 2x (8:1) TMDS channel and auxiliary signal switch 1x (16:1) TMDS channel and auxiliary signal switch Output disable feature Reduced power dissipation Removable output termination Allows building of larger arrays Two AD8191s support HDMI/DVI dual-link Standards compatible: HDMI receiver, DVI, HDCP Serial (I2C(R) slave) and parallel control interface 100-lead, 14 mm x 14 mm LQFP, Pb-free package
FUNCTIONAL BLOCK DIAGRAM
PP_CH[1:0] PP_OTO PP_OCL PP_EQ PP_EN PP_PRE[1:0]
RESET
PARALLEL SERIAL I2C_SDA I2C_SCL I2C_ADDR[2:0] VTTI
2
2
AD8191
CONTROL LOGIC AVCC DVCC AMUXVCC AVEE DVEE VTTO
3
CONFIG INTERFACE
+ IP_A[3:0] IN_A[3:0] - + IP_B[3:0] IN_B[3:0] - + IP_C[3:0] IN_C[3:0] - + IP_D[3:0] IN_D[3:0] -
4 4 4 4 4 4 4 4 4 4
SWITCH CORE EQ
PE
+ OP[3:0] - ON[3:0]
HIGH SPEED VTTI AUX_A[3:0] AUX_B[3:0] AUX_C[3:0] AUX_D[3:0]
BUFFERED
4 4 4 4
SWITCH CORE LOW SPEED UNBUFFERED
4
AUX_COM[3:0]
BIDIRECTIONAL
Figure 1.
TYPICAL APPLICATION
MEDIA CENTER HDTV SET HDMI RECEIVER SET-TOP BOX DVD PLAYER
01:18
GAME CONSOLE
Multiple input displays Projectors A/V receivers Set-top boxes Advanced television (HDTV) sets
Figure 2. Typical HDTV Application
GENERAL DESCRIPTION
The AD8191 is a HDMI/DVI switch featuring equalized TMDS inputs and pre-emphasized TMDS outputs, ideal for systems with long cable runs. Outputs can be set to a high impedance state to reduce the power dissipation and/or allow the construction of larger arrays using the wire-OR technique. Flexible channel bundling modes (for both the TMDS channels and the auxiliary signals) allow the AD8191 to be configured as a 4:1 single HDMI/DVI link switch, a dual 8:1 switch, or a single 16:1 switch.
The AD8191 is provided in a 100-lead LQFP, Pb-free, surface mount package specified to operate over the -40C to +85C temperature range.
PRODUCT HIGHLIGHTS
1. 2. 3. Supports data rates up to 1.65 Gbps, enabling 1080p HDMI formats and UXGA (1600 x 1200) DVI resolutions. Input cable equalizer enables use of long cables at the input (more than 20 meters of 24 AWG cable at 1080p). Auxiliary switch routes a DDC bus and two additional signals for a single-chip, HDMI 1.2a receive-compliant solution.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2006 Analog Devices, Inc. All rights reserved.
06123-002
APPLICATIONS
AD8191
06123-001
AD8191 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 Typical Application........................................................................... 1 General Description ......................................................................... 1 Product Highlights ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 Maximum Power Dissipation ..................................................... 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 9 Theory of Operation ...................................................................... 13 Introduction ................................................................................ 13 Input Channels............................................................................ 13 Output Channels ........................................................................ 13 High Speed (TMDS) Switching Modes ................................... 14 Auxiliary Switch.......................................................................... 14 Auxiliary (Low Speed) Switching Modes ................................ 15 Serial Control Interface.................................................................. 16 Reset ............................................................................................. 16 Write Procedure.......................................................................... 16 Read Procedure........................................................................... 17 Parallel Control Interface .............................................................. 18 Serial Interface Configuration Registers ..................................... 19 High Speed Device Modes Register......................................... 19 Auxiliary Device Modes Register............................................. 20 Receiver Settings Register ......................................................... 22 Input Termination Pulse Register 1 and Register 2 ............... 22 Receive Equalizer Register 1 and Register 2 ........................... 22 Transmitter Settings Register.................................................... 22 Parallel Interface Configuration Registers .................................. 23 High Speed Device Modes Register......................................... 23 Auxiliary Device Modes Register............................................. 23 Receiver Settings Register ......................................................... 24 Input Termination Pulse Register 1 and Register 2 ............... 24 Receive Equalizer Register 1 and Register 2 ........................... 24 Transmitter Settings Register.................................................... 24 Application Notes ........................................................................... 25 Pinout........................................................................................... 25 Cable Lengths and Equalization............................................... 25 PCB Layout Guidelines.............................................................. 26 Outline Dimensions ....................................................................... 30 Ordering Guide .......................................................................... 30
REVISION HISTORY
10/06--Revision 0: Initial Version
Rev. 0 | Page 2 of 32
AD8191 SPECIFICATIONS
TA = 27C, AVCC = 3.3 V, VTTI = 3.3 V, VTTO = 3.3 V, DVCC = 3.3 V, AMUXVCC = 5 V, AVEE = 0 V, DVEE = 0 V, differential input swing = 1000 mV, TMDS outputs terminated with external 50 resistors to 3.3 V, unless otherwise noted. Table 1.
Parameter DYNAMIC PERFORMANCE Maximum Data Rate (DR) per Channel Bit Error Rate (BER) Added Deterministic Jitter Added Random Jitter Differential Intrapair Skew Differential Interpair Skew 1 EQUALIZATION PERFORMANCE Receiver (Highest Setting) 2 Transmitter (Highest Setting) 3 INPUT CHARACTERISTICS Input Voltage Swing Input Common-Mode Voltage (VICM) OUTPUT CHARACTERISTICS High Voltage Level Low Voltage Level Rise/Fall Time (20% to 80%) INPUT TERMINATION Resistance AUXILIARY CHANNELS On Resistance, RAUX On Capacitance, CAUX Input/Output Voltage Range POWER SUPPLY AVCC QUIESCENT CURRENT AVCC Conditions/Comments NRZ PRBS 223 - 1 DR 1.65 Gbps, PRBS 223 - 1 At output At output Boost frequency = 825 MHz Boost frequency = 825 MHz Differential 150 AVCC - 800 AVCC - 10 AVCC - 600 75 Min 1.65 10-9 40 2 1 40 12 6 1200 AVCC AVCC + 10 AVCC - 400 200 ps (p-p) ps (rms) ps ps dB dB mV mV mV mV ps pF V V mA mA mA mA mA mA mA mA mW mW mW ms ms ns Typ Max Unit Gbps
Single-ended high speed channel Single-ended high speed channel
135 50 100 8
Single-ended
DC bias = 2.5 V, ac voltage = 3.5 V, f = 100 kHz DVEE Operating range Outputs disabled Outputs enabled, no pre-emphasis Outputs enabled, maximum pre-emphasis Input termination on 4 Output termination on, no pre-emphasis Output termination on, maximum pre-emphasis 3 30 48 88 5 35 72 3.2
AMUXVCC 3.3 40 60 100 40 40 80 7 0.01 271 574 910 3.6 44 64 110 54 46 90 8 0.1 361 671 1050 200 1.5
VTTI VTTO
DVCC AMUXVCC POWER DISSIPATION Outputs disabled Outputs enabled, no pre-emphasis Outputs enabled, maximum pre-emphasis TIMING CHARACTERISTICS Switching/Update Delay RESET Pulse Width High speed switching register: HS_CH All other configuration registers
115 384 704
50
Rev. 0 | Page 3 of 32
AD8191
Parameter SERIAL CONTROL INTERFACE 5 Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output Low Voltage, VOL PARALLEL CONTROL INTERFACE Input High Voltage, VIH Input Low Voltage, VIL
1 2
Conditions/Comments
Min 2
Typ
Max
Unit V V V V V V
0.8 2.4 0.4 2 0.8
Differential interpair skew is measured between the TMDS pairs of a single link. AD8191 output meets the transmitter eye diagram as defined in the DVI Standard Revision 1.0 and the HDMI Standard Revision 1.2a. 3 Cable output meets the receiver eye diagram mask as defined in the DVI Standard Revision 1.0 and the HDMI Standard Revision 1.2a. 4 Typical value assumes only the selected HDMI/DVI link is active with nominal signal swings and that the unselected HDMI/DVI links are deactivated. Minimum and maximum limits are measured at the respective extremes of input termination resistance and input voltage swing. 5 The AD8191 is an I2C slave and its serial control interface is based on the 3.3 V I2C bus specification.
Rev. 0 | Page 4 of 32
AD8191 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter AVCC to AVEE DVCC to DVEE DVEE to AVEE VTTI VTTO AMUXVCC Internal Power Dissipation High Speed Input Voltage High Speed Differential Input Voltage Low Speed Input Voltage I2C and Parallel Logic Input Voltage Storage Temperature Range Operating Temperature Range Junction Temperature Rating 3.7 V 3.7 V 0.3 V AVCC + 0.6 V AVCC + 0.6 V 5.5 V 2.2 W AVCC - 1.4 V < VIN < AVCC + 0.6 V 2.0 V DVEE - 0.3 V < VIN < AMUXVCC + 0.6 V DVEE - 0.3 V < VIN < DVCC + 0.6 V -65C to +125C -40C to +85C 150C
THERMAL RESISTANCE
JA is specified for the worst-case conditions: a device soldered in a 4-layer JEDEC circuit board for surface-mount packages. JC is specified for no airflow. Table 3. Thermal Resistance
Package Type 100-Lead LQFP JA 56 JC 19 Unit C/W
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the AD8191 is limited by the associated rise in junction temperature. The maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150C. Temporarily exceeding this limit may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. Exceeding a junction temperature of 175C for an extended period can result in device failure. To ensure proper operation, it is necessary to observe the maximum power rating as determined by the coefficients in Table 3.
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
Rev. 0 | Page 5 of 32
AD8191 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AUX_COM0 AUX_COM1 AUX_COM2 AUX_COM3 AMUXVCC PP_OTO AUX_A0 AUX_A1 AUX_A2 AUX_A3 AUX_B0 AUX_B1 AUX_B2 AUX_B3 AUX_C0 AUX_C1 AUX_C2 AUX_C3 AUX_D0 AUX_D1 AUX_D2 AUX_D3
78
PP_EQ
77
100
99
95
89
88
87
84
93
92
82
97
96
91
90
86
85
81
80
98
94
83
79
76
PP_EN
DVEE
AVCC IN_B0 IP_B0 AVEE IN_B1 IP_B1 VTTI IN_B2 IP_B2 AVEE IN_B3 IP_B3 AVCC IN_A0 IP_A0 AVEE IN_A1 IP_A1 VTTI IN_A2 IP_A2 AVCC IN_A3 IP_A3 AVEE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 PIN 1 INDICATOR
75 74 73 72 71 70 69 68 67 66
AVCC IP_C3 IN_C3 AVEE IP_C2 IN_C2 VTTI IP_C1 IN_C1 AVEE IP_C0 IN_C0 AVCC IP_D3 IN_D3 AVEE IP_D2 IN_D2 VTTI IP_D1 IN_D1 AVCC IP_D0 IN_D0 AVEE
AD8191
TOP VIEW (Not to Scale)
65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
27
31
37
38
39
42
48
49
26
33
34
44
29
30
35
36
40
41
45
46
28
32
VTTO
VTTO
OP0
OP1
OP2
DVEE
ON0
OP3
43
47
PP_PRE0
PP_PRE1
PP_OCL
PP_CH0
RESET
DVCC
DVCC
ON3
ON1
ON2
DVCC
I2C_SCL
PP_CH1
I2C_ADDR0
I2C_ADDR1
I2C_ADDR2
I2C_SDA
50
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1, 13, 22, 54, 63, 75 2 3 4, 10, 16, 25, 51, 60, 66, 72 5 6 7, 19, 57, 69 8 9 11 12 14 15 Mnemonic AVCC IN_B0 IP_B0 AVEE IN_B1 IP_B1 VTTI IN_B2 IP_B2 IN_B3 IP_B3 IN_A0 IP_A0 Type 1 Power HS I HS I Power HS I HS I Power HS I HS I HS I HS I HS I HS I Description Positive Analog Supply. 3.3 V nominal. High Speed Input Complement. High Speed Input. Negative Analog Supply. 0 V nominal. High Speed Input Complement. High Speed Input. Input Termination Supply. Nominally connected to AVCC. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input.
Rev. 0 | Page 6 of 32
06123-003
AD8191
Pin No. 17 18 20 21 23 24 26 27 28 29, 95 30 31 32, 38, 47 33 34 35, 41 36 37 39 40 42 43 44 45 46 48 49 50 52 53 55 56 58 59 61 62 64 65 67 68 70 71 73 74 76 77 78 Mnemonic IN_A1 IP_A1 IN_A2 IP_A2 IN_A3 IP_A3 I2C_ADDR0 I2C_ADDR1 I2C_ADDR2 DVEE PP_CH0 PP_CH1 DVCC ON0 OP0 VTTO ON1 OP1 ON2 OP2 ON3 OP3 RESET PP_PRE0 PP_PRE1 PP_OCL I2C_SCL I2C_SDA IN_D0 IP_D0 IN_D1 IP_D1 IN_D2 IP_D2 IN_D3 IP_D3 IN_C0 IP_C0 IN_C1 IP_C1 IN_C2 IP_C2 IN_C3 IP_C3 PP_EN PP_EQ AUX_D3 Type 1 HS I HS I HS I HS I HS I HS I Control Control Control Power Control Control Power HS O HS O Power HS O HS O HS O HS O HS O HS O Control Control Control Control Control Control HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I HS I Control Control LS I/O Description High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. I2C Address 1st LSB. I2C Address 2nd LSB. I2C Address 3rd LSB. Negative Digital and Auxiliary Multiplexer Power Supply. 0 V nominal. Quad Switching Mode High Speed Source Selection Parallel Interface LSB. Quad Switching Mode High Speed Source Selection Parallel Interface MSB. Positive Digital Power Supply. 3.3 V nominal. High Speed Output Complement. High Speed Output. Output Termination Supply. Nominally connected to AVCC. High Speed Output Complement. High Speed Output. High Speed Output Complement. High Speed Output. High Speed Output Complement. High Speed Output. Configuration Registers Reset. Normally pulled up to AVCC. High Speed Pre-Emphasis Selection Parallel Interface LSB. High Speed Pre-Emphasis Selection Parallel Interface MSB. High Speed Output Current Level Parallel Interface. I2C Clock. I2C Data. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Input Complement. High Speed Input. High Speed Output Enable Parallel Interface. High Speed Equalization Selection Parallel Interface. Low Speed Input/Output.
Rev. 0 | Page 7 of 32
AD8191
Pin No. 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 96 97 98 99 100
1
Mnemonic AUX_D2 AUX_D1 AUX_D0 AMUXVCC AUX_C3 AUX_C2 AUX_C1 AUX_C0 AUX_COM3 AUX_COM2 AUX_COM1 AUX_COM0 AUX_B3 AUX_B2 AUX_B1 AUX_B0 AUX_A3 AUX_A2 AUX_A1 AUX_A0 PP_OTO
Type 1 LS I/O LS I/O LS I/O Power LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O LS I/O Control
Description Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Positive Auxiliary Multiplexer Supply. 5V typical. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Common Input/Output. Low Speed Common Input/Output. Low Speed Common Input/Output. Low Speed Common Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. Low Speed Input/Output. High Speed Output Termination Selection Parallel Interface.
HS = high speed, LS = low speed, I = input, O = output.
Rev. 0 | Page 8 of 32
AD8191 TYPICAL PERFORMANCE CHARACTERISTICS
TA = 27C, AVCC = 3.3 V, VTTI = 3.3 V, VTTO = 3.3 V, DVCC = 3.3 V, AMUXVCC = 5 V, AVEE = 0 V, DVEE = 0 V, differential input swing = 1000 mV, TMDS outputs terminated with external 50 resistors to 3.3 V, pattern = PRBS 27 - 1, data rate = 1.65 Gbps, unless otherwise noted.
HDMI CABLE DIGITAL PATTERN GENERATOR
EVALUATION BOARD
AD8191
SERIAL DATA ANALYZER
SMA COAX CABLE
06123-035
REFERENCE EYE DIAGRAM AT TP1
TP1
TP2
TP3
Figure 4. Test Circuit Diagram for RX Eye Diagram
250mV/DIV
06123-036
250mV/DIV
0.125UI/DIV AT 1.65Gbps
0.125UI/DIV AT 1.65Gbps
Figure 5. RX Eye Diagram at TP2 (Cable = 2 meters, 30 AWG)
Figure 7. RX Eye Diagram at TP3, EQ = 6 dB (Cable = 2 meters, 30 AWG)
250mV/DIV
06123-037
250mV/DIV
0.125UI/DIV AT 1.65Gbps
0.125UI/DIV AT 1.65Gbps
Figure 6. RX Eye Diagram at TP2 (Cable = 20 meters, 24 AWG)
Figure 8. RX Eye Diagram at TP3, EQ = 12 dB (Cable = 20 meters, 24 AWG)
Rev. 0 | Page 9 of 32
06123-039
06123-038
AD8191
TA = 27C, AVCC = 3.3 V, VTTI = 3.3 V, VTTO = 3.3 V, DVCC = 3.3 V, AMUXVCC = 5 V, AVEE = 0 V, DVEE = 0 V, differential input swing = 1000 mV, TMDS outputs terminated with external 50 resistors to 3.3 V, pattern = PRBS 27 - 1, data rate = 1.65 Gbps, unless otherwise noted.
HDMI CABLE DIGITAL PATTERN GENERATOR
EVALUATION BOARD
AD8191
SERIAL DATA ANALYZER
SMA COAX CABLE
06123-040
REFERENCE EYE DIAGRAM AT TP1
TP1
TP2
TP3
Figure 9. Test Circuit Diagram for TX Eye Diagrams
250mV/DIV
06123-041
250mV/DIV
0.125UI/DIV AT 1.65Gbps
0.125UI/DIV AT 1.65Gbps
Figure 10. TX Eye Diagram at TP2, PE = 2 dB
Figure 12. TX Eye Diagram at TP3, PE = 2 dB (Cable = 2 meters, 30 AWG)
250mV/DIV
06123-042
250mV/DIV
0.125UI/DIV AT 1.65Gbps
0.125UI/DIV AT 1.65Gbps
Figure 11. TX Eye Diagram at TP2, PE = 6 dB
Figure 13. TX Diagram at TP3, PE = 6 dB (Cable = 10 meters, 28 AWG)
Rev. 0 | Page 10 of 32
06123-044
06123-043
AD8191
TA = 27C, AVCC = 3.3 V, VTTI = 3.3 V, VTTO = 3.3 V, DVCC = 3.3 V, AMUXVCC = 5 V, AVEE = 0 V, DVEE = 0 V, differential input swing = 1000 mV, TMDS outputs terminated with external 50 resistors to 3.3 V, pattern = PRBS 27 - 1, data rate = 1.65 Gbps, unless otherwise noted.
0.6 2m CABLE = 30AWG 5m TO 10m CABLES = 28AWG 15m TO 30m CABLES = 24AWG 0.6 2m CABLE = 30AWG 5m TO 10m CABLES = 28AWG 15m TO 20m CABLES = 24AWG
0.5 DETERMINISTIC JITTER (UI)
0.5
0.4 1080p, EQ = 12dB 1.65Gbps, EQ = 12dB
DETERMINISTIC JITTER (UI)
720p, EQ = 12dB
0.4 1080p, PE OFF 0.3 720p, PE OFF 1080p, MAX PE
0.3
0.2
0.2 720p, MAX PE 0.1 480p, PE OFF 480p, MAX PE
0.1
480p, EQ = 12dB
0
5
10
15
20
25
30
35
06123-014
0
5
10
15
20
25
HDMI CABLE LENGTH (m)
HDMI CABLE LENGTH (m)
Figure 14. Jitter vs. Input Cable Length (See Figure 4 for Test Setup)
60
Figure 17. Jitter vs. Output Cable Length (See Figure 9 for Test Setup)
1200
50
1000
30 480p 20 480i DJ (p-p) 10 RJ (rms) 0 1080i/720p 1080p
EYE HEIGHT (mV)
40
800
JITTER (ps)
1.65Gbps
600
400
200
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
DATA RATE (Gbps)
DATA RATE (Gbps)
Figure 15. Jitter vs. Data Rate
70 60 50 800 700 600
Figure 18. Eye Height vs. Data Rate
EYE HEIGHT (mV)
JITTER (ps)
500 400 300 200 100 0 3.0
40 30 20 10 RJ (rms) 3.1 3.2 3.3 3.4 3.5 3.6
06123-016
DJ (p-p)
3.1
3.2
3.3
3.4
3.5
3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Figure 16. Jitter vs. Supply Voltage
Figure 19. Eye Height vs. Supply Voltage
Rev. 0 | Page 11 of 32
06123-019
0 3.0
06123-018
06123-015
0
06123-017
0
0
AD8191
TA = 27C, AVCC = 3.3 V, VTTI = 3.3 V, VTTO = 3.3 V, DVCC = 3.3 V, AMUXVCC = 5 V, AVEE = 0 V, DVEE = 0 V, differential input swing = 1000 mV, TMDS outputs terminated with external 50 resistors to 3.3 V, pattern = PRBS 27 - 1, data rate = 1.65 Gbps, unless otherwise noted.
30 50 45 25 40 35 JITTER (ps) 30 25 20 15 10 RJ (rms) 0 5
06123-020
20
JITTER (ps)
15
DJ (p-p)
10
DJ (p-p)
5
RJ (rms) 2.7 2.9 3.1 3.3 3.5 3.7
06123-023
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 2.5
DIFFERENTIAL INPUT SWING (mV)
INPUT COMMON-MODE VOLTAGE (V)
Figure 20. Jitter vs. Differential Input Swing
50 120 115 DIFFERENTIAL INPUT TERMINATION RESISTANCE () 40 110 105 100 95 90 85 RJ (rms)
06123-021
Figure 23. Jitter vs. Input Common-Mode Voltage
JITTER (ps)
30
20
DJ (p-p)
10
-40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
Figure 21. Jitter vs. Temperature
160 140
Figure 24. Differential Input Termination Resistance vs. Temperature
RISE/FALL TIME 20% TO 80% (ps)
FALL TIME 120 RISE TIME 100 80 60 40 20 0 -40
-20
0
20
40
60
80
100
TEMPERATURE (C)
Figure 22. Rise and Fall Time vs. Temperature
Rev. 0 | Page 12 of 32
06123-022
06123-024
0 -60
80 -40
AD8191 THEORY OF OPERATION
INTRODUCTION
The primary function of the AD8191 is to switch one of four (HDMI or DVI) single-link sources to one output. Each HDMI/DVI link consists of four differential, high speed channels and four auxiliary single-ended, low speed control signals. The high speed channels include a data-word clock and three transition minimized differential signaling (TMDS) data channels running at 10x the data-word clock frequency for data rates up to 1.65 Gbps. The four low speed control signals are 5 V tolerant bidirectional lines that can carry configuration signals, HDCP encryption, and other information, depending upon the specific application. All four high speed TMDS channels in a given link are identical; that is, the pixel clock can be run on any of the four TMDS channels. Transmit and receive channel compensation is provided for the high speed channels where the user can (manually) select among a number of fixed settings. The AD8191 switching logic has three modes: quad mode (a quad 4:1 switch), dual mode (a dual 8:1 switch) and single mode (one 16:1 switch). The AD8191 has two control interfaces. Users have the option of controlling the part through either the parallel control interface or the I2C serial control interface. The AD8191 has eight user-programmable I2C slave addresses to allow multiple AD8191s to be controlled by a single I2C bus. A RESET pin is provided to restore the control registers of the AD8191 to default values. In all cases, serial programming values override any prior parallel programming values and any use of the serial control interface disables the parallel control interface until the AD8191 is reset. When using the serial control interface, all three switching modes (quad, dual, and single) are accessible and the high speed channel switching mode is controlled independently of the auxiliary signal switching mode. When using the parallel control interface, only the quad switching mode is accessible, and the same channel select bus (PP_CH[1:0]) simultaneously switches both the high speed channels and the auxiliary signals. terminations are enabled and cannot be switched when programming the AD8191 through the parallel control interface.
VTTI 50 50
IP_xx IN_xx
CABLE EQ
AVEE
Figure 25. High Speed Input Simplified Schematic
The input equalizer can be manually configured to provide two different levels of high frequency boost: 6 dB or 12 dB. The user can individually control the equalization level of the eight high speed input channels by selectively programming the associated RX_EQ bits in the receive equalizer register through the serial control interface. Alternately, the user can globally control the equalization level of all eight high speed input channels by setting the PP_EQ pin of the parallel control interface. No specific cable length is suggested for a particular equalization setting because cable performance varies widely between manufacturers; however, in general, the equalization of the AD8191 can be set to 12 dB without degrading the signal integrity, even for short input cables. At the 12 dB setting, the AD8191 can equalize more than 20 meters of 24 AWG cable at 1.65 Gbps.
OUTPUT CHANNELS
Each high speed output differential pair is terminated to the 3.3 V VTTO power supply through a 50 on-chip resistor (Figure 26). This termination is user-selectable; it can be turned on or off by programming the TX_PTO bit of the transmitter settings register through the serial control interface, or by setting the PP_OTO pin of the parallel control interface. The output termination resistors of the AD8191 back-terminate the output TMDS transmission lines. These back-terminations act to absorb reflections from impedance discontinuities on the output traces, improving the signal integrity of the output traces and adding flexibility to how the output traces can be routed. For example, interlayer vias can be used to route the AD8191 TMDS outputs on multiple layers of the PCB without severely degrading the quality of the output signal. The AD8191 output has a disable feature that places the outputs in a tristate mode. This mode is enabled by programming the HS_EN bit of the high speed device modes register through the serial control interface or by setting the PP_EN pin of the parallel control interface. Larger wire-OR'ed arrays can be constructed using the AD8191 in this mode.
INPUT CHANNELS
Each high speed input differential pair terminates to the 3.3 V VTTI power supply through a pair of single-ended 50 onchip resistors, as shown in Figure 25. The input terminations can be optionally disconnected for approximately 100 ms following a source switch. The user can program which of the 16 high speed input channels employs this feature by selectively programming the associated RX_PT bits in the input termination pulse register through the serial control interface. Additionally, all the input terminations can be disconnected by programming the RX_TO bit in the receiver settings register. By default, the input termination is enabled. The input
Rev. 0 | Page 13 of 32
06123-004
AD8191
VTTO 50 50
OPx
ONx
register in accordance with the switch mapping listed in Table 8. When using the parallel control interface, the user selects which TMDS link is routed to the output by setting the PP_CH bus of the parallel control interface in accordance with the switch mapping listed in Table 26.
DISABLE
Dual Switching Mode
06123-005
IOUT
AVEE
Figure 26. High Speed Output Simplified Schematic
The output pre-emphasis can be manually configured to provide one of four different levels of high frequency boost. The specific boost level is selected by programming the TX_PE bits of the transmitter settings register through the serial control interface, or by setting the PP_PE bus of the parallel control interface. No specific cable length is suggested for a particular pre-emphasis setting because cable performance varies widely between manufacturers.
Figure 27. Auxiliary Channel Simplified Schematic, AUX_A0 to AUX_COM0 Routing Example
HIGH SPEED (TMDS) SWITCHING MODES
The AD8191 has three high speed switching modes: quad, dual, and single. These are selected by programming the HS_SM bits of the high speed device modes register through the serial control interface.
Quad Switching Mode
This is the default mode. In quad mode, the AD8191 behaves like a 4:1 HDMI/DVI link multiplexer routing groups of four TMDS input channels to the four-channel output. This mode is accessible through both the serial and the parallel control interfaces. When using the serial control interface, the user selects which TMDS link is routed to the output by programming the HS_CH bits of the high speed device modes
When turning off the AD8191, care needs to be taken with the AMUXVCC supply to ensure that the auxiliary multiplexer pins remain in a high impedance state. A scenario that illustrates this requirement is one where the auxiliary multiplexer is used to switch the display data channel (DDC) bus. In some applications, additional devices can be connected to the DDC bus (such as an EEPROM with EDID information) upstream of the AD8191. Extended display identification data (EDID) is a VESA standard-defined data format for conveying display configuration information to sources to optimize display use. EDID devices may need to be available via the DDC bus, regardless of the state of the AD8191 and any downstream circuit. For this configuration, the auxiliary inputs of the powered down AD8191 need to be in a high impedance state to avoid pulling down on the DDC lines and preventing these other devices from using the bus. When the AD8191 is powered from a simple resistor network, as shown in Figure 28, it uses the 5 V supply that is required from any HDMI/DVI source to guarantee high impedance of
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06123-006
The AD8191 requires output termination resistors when the high speed outputs are enabled. Termination can be internal and/or external. The internal terminations of the AD8191 are enabled by programming the TX_PTO bit of the transmitter settings register or by setting the PP_OTO pin of the parallel control interface. The internal terminations of the AD8191 default to the setting indicated by PP_OTO upon reset. External terminations can be provided either by on-board resistors or by the input termination resistors of an HDMI/DVI receiver. If both the internal terminations are enabled and external terminations are present, set the output current level to 20 mA by programming the TX_OCL bit of the transmitter settings register through the serial control interface or by setting the PP_OCL pin of the parallel control interface. The output current level defaults to the level indicated by PP_OCL upon reset. If only external terminations are provided (if the internal terminations are disabled), set the output current level to 10 mA by programming the TX_OCL bit of the transmitter settings register or by setting the PP_OCL pin of the parallel control interface. The high speed outputs must be disabled if there are no output termination resistors present in the system.
In this mode, the AD8191 behaves as a locked dual [8:1] TMDS channel switch. The two 8:1 switches share the channel select input and, therefore, switch together. The user selects which two out of the eight possible input groups are routed to output by programming the HS_CH bits of the high speed device modes register in accordance with the switch mapping listed in Table 9. This mode is only accessible through the serial control interface.
Single Switching Mode
In this mode, the AD8191 behaves as a single 16:1 TMDS channel multiplexer; one of the 16 input channels is routed to all of the outputs. The user selects which input channel is routed to the outputs by programming the HS_CH bits in the high speed device modes register in accordance with the switch mapping listed in Table 10. This mode is only accessible through the serial control interface.
AUXILIARY SWITCH
The auxiliary (low speed) lines have no amplification. They are routed using a passive switch that is bandwidth compatible with standard speed I2C. The schematic equivalent for this passive connection is shown in Figure 27.
AUX_A0 1/2CAUX RAUX AUX_COM0 1/2CAUX
AD8191
the auxiliary multiplexer pins. The AMUXVCC supply does not draw any static current; therefore, it is recommended that the resistor network tap the 5 V supplies as close to the connectors as possible to avoid any additional voltage drop. This precaution does not need to be taken if the DDC peripheral circuitry is connected to the bus downstream of the AD8191.
PIN 18 HDMI CONNECTOR PIN 14 DVI CONNECTOR SOURCE A +5V 10k |<50mA PERIPHERAL CIRCUITRY PERIPHERAL CIRCUITRY |<50mA SOURCE B +5V 10k +5V INTERNAL (IF ANY) PIN 18 HDMI CONNECTOR PIN 14 DVI CONNECTOR 10M 10k +5V SOURCE C |<50mA AMUXVCC PERIPHERAL CIRCUITRY PERIPHERAL CIRCUITRY |<50mA
06123-007
Quad Switching Mode
This is the default mode. In quad mode, the AD8191 behaves like a 4:1 auxiliary link multiplexer, routing groups of four auxiliary input signals to the four-signal output. The user can select which group of inputs is routed to the output by programming the AUX_CH bits of the auxiliary device modes register through the serial control interface in accordance with the switch mapping listed in Table 13. Alternately, the user can select which group of inputs is routed to the output by setting the PP_CH bus of the parallel control interface in accordance with the switch mapping listed in Table 27.
Dual Switching Mode
In this mode, the AD8191 behaves as a locked dual [8:1] auxiliary signal switch. The two 8:1 switches share the channel select input and, therefore, switch together. The user selects which two out of the eight possible input groups are routed to the output by programming the AUX_CH bits of the auxiliary device modes register in accordance with the switch mapping listed in Table 14. This mode is only accessible through the serial control interface.
AD8191
10k
+5V SOURCE D
PIN 18 HDMI CONNECTOR PIN 14 DVI CONNECTOR
PIN 18 HDMI CONNECTOR PIN 14 DVI CONNECTOR
Figure 28. Suggested AMUXVCC Power Scheme
AUXILIARY (LOW SPEED) SWITCHING MODES
The AD8191 has three auxiliary switching modes: quad, dual, and single. These are selected by programming the AUX_SM bits of the auxiliary device modes register through the serial control interface. The auxiliary switching mode is independent of the high speed switching mode whenever the part is controlled through the serial control interface. When the part is controlled through the parallel control interface, however, only quad mode is accessible and the auxiliary switching mode cannot be independently controlled.
Single Switching Mode
In this mode the AD8191 behaves as a single 16:1 TMDS channel multiplexer; a single channel, out of a possible 16, is routed to all of the outputs. The user selects which input channel is routed to the outputs by programming the AUX_CH bits of the auxiliary device modes register in accordance with the switch mapping listed in Table 15. This mode is only accessible through the serial control interface.
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AD8191 SERIAL CONTROL INTERFACE
RESET
On initial power-up, or at any point in operation, the AD8191 register set can be restored to preprogrammed default values by pulling the RESET pin to low in accordance with the specifications in Table 1. During normal operation, however, the RESET pin must be pulled up to 3.3 V. Following a reset, the preprogrammed default values of the AD8191 register set correspond to the state of the parallel interface configuration registers, as listed in Table 24. The AD8191 can be controlled through the parallel control interface until the first serial control event occurs. As soon as any serial control event occurs, the serial programming values, corresponding to the state of the serial interface configuration registers (Table 5), override any prior parallel programming values, and the parallel control interface is disabled until the part is subsequently reset. 4. 5. 6. 7. Wait for the AD8191 to acknowledge the request. Send the register address (eight bits) to which data is to be written. This transfer should be MSB first. Wait for the AD8191 to acknowledge the request. Send the data (eight bits) to be written to the register whose address was set in Step 5. This transfer should be MSB first. Wait for the AD8191 to acknowledge the request. Perform one of the following: 9a. Send a stop condition (while holding the I2C_SCL line high, pull the I2C_SDA line high) and release control of the bus to end the transaction (shown in Figure 29). 9b. Send a repeated start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low) and continue with Step 2 in this procedure to perform another write. 9c. Send a repeated start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low) and continue with Step 2 of the read procedure (in the Read Procedure section) to perform a read from another address. 9d. Send a repeated start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low) and continue with Step 8 of the read procedure (in the Read Procedure section) to perform a read from the same address set in Step 5.
8. 9.
WRITE PROCEDURE
To write data to the AD8191 register set, an I2C master (such as a microcontroller) needs to send the appropriate control signals to the AD8191 slave device. The signals are controlled by the I2C master, unless otherwise specified. For a diagram of the procedure, see Figure 29. The steps for a write procedure are as follows: 1. 2. Send a start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low). Send the AD8191 part address (seven bits). The upper four bits of the AD8191 part address are the static value [1001] and the three LSBs are set by Input Pin I2C_ADDR2, Input Pin I2C_ADDR1, and Input Pin I2C_ADDR0 (LSB). This transfer should be MSB first. Send the write indicator bit (0).
I2C_SCL R/W GENERAL CASE I2C_SDA START FIXED PART ADDR ADDR ACK EXAMPLE I2C_SDA 1 2 3 4 5
3.
*
REGISTER ADDR ACK
DATA ACK
STOP
6
7
8
9
06123-008
*THE SWITCHING/UPDATE DELAY BEGINS AT THE FALLING EDGE OF THE LAST DATA BIT; FOR EXAMPLE, THE FALLING EDGE JUST BEFORE STEP 8.
Figure 29. I2C Write Diagram
Rev. 0 | Page 16 of 32
AD8191
I2C_SCL R/W GENERAL CASE I2C_SDA EXAMPLE I2C_SDA 1 2 3 4 5
2
R/W REGISTER ADDR SR ACK FIXED PART ADDR ADDR ACK DATA ACK STOP
START
FIXED PART ADDR
ADDR ACK
6
7
8
9 10 11
12
13
Figure 30. I C Read Diagram
READ PROCEDURE
To read data from the AD8191 register set, an I C master (such as a microcontroller) needs to send the appropriate control signals to the AD8191 slave device. The signals are controlled by the I2C master, unless otherwise specified. For a diagram of the procedure, see Figure 30. The steps for a read procedure are as follows: 1. 2. Send a start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low). Send the AD8191 part address (seven bits). The upper four bits of the AD8191 part address are the static value [1001] and the three LSBs are set by Input Pin I2C_ADDR2, Input Pin I2C_ADDR1, and Input Pin I2C_ADDR0 (LSB). This transfer should be MSB first. Send the write indicator bit (0). Wait for the AD8191 to acknowledge the request. Send the register address (eight bits) from which data is to be read. This transfer should be MSB first. Wait for the AD8191 to acknowledge the request. Send a repeated start condition (Sr) by holding the I2C_SCL line high and pulling the I2C_SDA line low. Resend the AD8191 part address (seven bits) from Step 2. The upper four bits of the AD8191 part address are the static value [1001] and the three LSBs are set by the Input Pin I2C_ADDR2, I2C_ADDR1 and Input Pin I2C_ADDR0 (LSB). This transfer should be MSB first.
2
9.
Send the read indicator bit (1).
10. Wait for the AD8191 to acknowledge the request. 11. The AD8191 serially transfers the data (eight bits) held in the register indicated by the address set in Step 5. This data is sent MSB first. 12. Acknowledge the data from the AD8191. 13. Perform one of the following: 13a. Send a stop condition (while holding the I2C_SCL line high, pull the SDA line high) and release control of the bus to end the transaction (shown in Figure 30). 13b. Send a repeated start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low) and continue with Step 2 of the write procedure (previous Write Procedure section) to perform a write. 13c. Send a repeated start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low) and continue with Step 2 of this procedure to perform a read from another address. 13d. Send a repeated start condition (while holding the I2C_SCL line high, pull the I2C_SDA line low) and continue with Step 8 of this procedure to perform a read from the same address.
3. 4. 5. 6. 7. 8.
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06123-009
AD8191 PARALLEL CONTROL INTERFACE
The AD8191 can be controlled through the parallel interface using the PP_EN, PP_CH[1:0], PP_EQ, PP_PRE[1:0], PP_OTO, and PP_OCL pins. Logic levels for the parallel interface pins are set in accordance with the specifications listed in Table 1. Setting these pins updates the parallel control interface registers, as listed in Table 24. Following a reset, the AD8191 can be controlled through the parallel control interface until the first serial control event occurs. As soon as any serial control event occurs, the serial programming values override any prior parallel programming values, and the parallel control interface is disabled until the part is subsequently reset. The default serial programming values correspond to the state of the serial interface configuration registers, as listed in Table 5.
Rev. 0 | Page 18 of 32
AD8191 SERIAL INTERFACE CONFIGURATION REGISTERS
The serial interface configuration registers can be read and written using the I2C serial control interface, Pin I2C_SDA, and Pin I2C_SCL. The least significant bits of the AD8191 I2C part address are set by tying the Pin I2C_ADDR2, Pin I2C_ADDR1, and Pin I2C_ADDR0 to 3.3 V (Logic 1) or 0 V (Logic 0). As soon as the serial control interface is used, the parallel control interface is disabled until the AD8191 is reset as described in the Serial Control Interface section. Table 5. Serial (I2C) Interface Register Map
Name
High Speed Device Modes
Bit 7
Bit 6
High speed switch enable HS_EN Auxiliary switch enable AUX_EN
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Addr.
0x00
Default
0x40
High speed switching mode select
High speed source select
Auxiliary Device Modes Receiver Settings
HS_SM[1] HS_SM[0] Auxiliary switching mode select AUX_SM[1] AUX_SM[0]
HS_CH[3]
HS_CH[2] HS_CH[1] HS_CH[0] Auxiliary switch source select
0x01
0x40
AUX_CH[3]
AUX_CH[2]
AUX_CH[1]
AUX_CH[0] High speed input termination select RX_TO
0x10
0x01
Input Termination Pulse 1 Input Termination Pulse 2 Receive Equalizer 1 Receive Equalizer 2 Transmitter Settings
RX_PT[7]
RX_PT[15] RX_EQ[7] RX_EQ[15]
Source A and Source B : input termination pulse-on-source switch select (disconnect termination for a short period of time) RX_PT[6] RX_PT[5] RX_PT[4] RX_PT[3] RX_PT[2] RX_PT[1] Source C and Source D: input termination pulse-on-source switch select (disconnect termination for a short period of time) RX_PT[14] RX_PT[13] RX_PT[12] RX_PT[11] RX_PT[10] RX_PT[9] Source A and Source B: input equalization level select RX_EQ[6] RX_EQ[5] RX_EQ[4] RX_EQ[3] RX_EQ[2] RX_EQ[1] Source C and Source D: input equalization level select RX_EQ[14] RX_EQ[13] RX_EQ[12] RX_EQ[11] RX_EQ[10] RX_EQ[9] High speed output High speed pre-emphasis level select output termination select TX_PE[1] TX_PE[0] TX_PTO
0x11 RX_PT [0] 0x12 RX_PT[8] 0x13 RX_EQ[0] 0x14 RX_EQ[8] High speed output current level select TX_OCL 0x20
0x00
0x00
0x00 0x00 0x03
HIGH SPEED DEVICE MODES REGISTER
HS_EN: High Speed (TMDS) Channels Enable Bit
Table 6. HS_EN Description
HS_EN 0 1 Description High speed channels off, low power/standby mode High speed channels on
HS_CH[3:0]: High Speed (TMDS) Switch Source Select Bus
Table 8. Quad Mode, 4x [4:1], High Speed Switch Mapping
HS_CH[3:0] XX00 XX01 XX10 XX11 O[3:0] A[3:0] B[3:0] C[3:0] D[3:0] Description High Speed Source A switched to output High Speed Source B switched to output High Speed Source C switched to output High Speed Source D switched to output
HS_SM[1:0]: High Speed (TMDS) Switching Mode Select Bus
Table 7. HS_SM Description
HS_SM[1:0] 00 01 10 11 Description Quad mode, 4x [4:1] Dual mode, 2x [8:1] Single mode, 1x [16:1] Illegal value; previous value of HS_SM[1:0] retained
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AD8191
Table 9. Dual Mode, 2x [8:1], High Speed Switch Mapping
HS_CH[3:0] X000 X001 X010 X011 X100 X101 X110 X111 O[3:2] A1 A3 B1 B3 C1 C3 D1 D3 O[1:0] A0 A2 B0 B2 C0 C2 D0 D2 Description The A0 and A1 high speed channels switched to output The A2 and A3 high speed channels switched to output The B0 and B1 high speed channels switched to output The B2 and B3 high speed channels switched to output The C0 and C1 high speed channels switched to output The C2 and C3 high speed channels switched to output The D0 and D1 high speed channels switched to output The D2 and D3 high speed channels switched to output
AUXILIARY DEVICE MODES REGISTER
AUX_EN: Auxiliary (Low Speed) Switch Enable Bit
Table 11. AUX_EN Description
AUX_EN 0 Description Auxiliary switch off, no low speed input/output to low speed common input/output connection Auxiliary switch on
1
AUX_SM[1:0]: Auxiliary (Low Speed) Switching Mode Select Bus
Table 12. AUX_SM[1:0] Description
AUX_SM[1:0] 00 01 10 11 Description Quad Mode, 4x [4:1] Dual Mode, 2x [8:1] Single Mode, 1x [6:1] Illegal value; previous value of AUX_SM[1:0] retained
Table 10. Single Mode, 1x [16:1], High Speed Switch Mapping
HS_CH[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 O[3:0] A0 A1 A2 A3 B0 B1 B2 B3 C0 C1 C2 C3 D0 D1 D2 D3 Description High Speed Channel A0 switched to output High Speed Channel A1 switched to output High Speed Channel A2 switched to output High Speed Channel A3 switched to output High Speed Channel B0 switched to output High Speed Channel B1 switched to output High Speed Channel B2 switched to output High Speed Channel B3 switched to output High Speed Channel C0 switched to output High Speed Channel C1 switched to output High Speed Channel C2 switched to output High Speed Channel C3 switched to output High Speed Channel D0 switched to output High Speed Channel D1 switched to output High Speed Channel D2 switched to output High Speed Channel D3 switched to output
AUX_CH[3:0]: Auxiliary (Low Speed) Switch Source Select Bus
Table 13. Quad Mode, 4x [4:1], Auxiliary Switch Mapping
AUX_CH[3:0] XX00 XX01 XX10 XX11 AUX_COM[3:0] AUX_A[3:0] AUX_B[3:0] AUX_C[3:0] AUX_D[3:0] Description Auxiliary Source A switched to output Auxiliary Source B switched to output Auxiliary Source C switched to output Auxiliary Source D switched to output
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AD8191
Table 14. Dual Mode, 2x [8:1], Auxiliary Switch Mapping
AUX_CH[3:0] X000 AUX_COM[3:2] AUX_C0 AUX_COM[1:0] AUX_A0 Description The A0 and C0 auxiliary channels switched to output The A1 and C1 auxiliary channels switched to output The A2 and C2 auxiliary channels switched to output The A3 and C3 auxiliary channels switched to output The B0 and D0 auxiliary channels switched to output The B1 and D1 auxiliary channels switched to output The B2 and D2 auxiliary channels switched to output The B3 and D3 auxiliary channels switched to output
Table 15. Single Mode, 1x [16:1], Auxiliary Switch Mapping
AUX_CH[3:0] 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 AUX_COM[3:0] AUX_A0 AUX_A1 AUX_A2 AUX_A3 AUX_B0 AUX_B1 AUX_B2 AUX_B3 AUX_C0 AUX_C1 AUX_C2 AUX_C3 AUX_D0 AUX_D1 AUX_D2 AUX_D3 Description Auxiliary Channel A0 switched to output Auxiliary Channel A1 switched to output Auxiliary Channel A2 switched to output Auxiliary Channel A3 switched to output Auxiliary Channel B0 switched to output Auxiliary Channel B1 switched to output Auxiliary Channel B2 switched to output Auxiliary Channel B3 switched to output Auxiliary Channel C0 switched to output Auxiliary Channel C1 switched to output Auxiliary Channel C2 switched to output Auxiliary Channel C3 switched to output Auxiliary Channel D0 switched to output Auxiliary Channel D1 switched to output Auxiliary Channel D2 switched to output Auxiliary Channel D3 switched to output
X001
AUX_C1
AUX_A1
X010
AUX_C2
AUX_A2
X011
AUX_C3
AUX_A3
X100
AUX_D0
AUX_B0
X101
AUX_D1
AUX_B1
X110
AUX_D2
AUX_B2
X111
AUX_D3
AUX_B3
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AD8191
RECEIVER SETTINGS REGISTER
RX_TO: High Speed (TMDS) Channels Input Termination On/Off Select Bit
Table 16. RX_TO Description
RX_TO 0 1 Description Input termination off Input termination on (can be pulsed on and off according to settings in the input termination pulse register)
RECEIVE EQUALIZER REGISTER 1 AND REGISTER 2
RX_EQ[X]: High Speed (TMDS) Input X Equalization Level Select Bit
Table 19. RX_EQ[X] Description
RX_EQ[X] 0 1 Description Low equalization (6 dB) High equalization (12 dB)
Table 20. RX_EQ[X] Mapping
RX_EQ[X] Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 Bit 9 Bit 10 Bit 11 Bit 12 Bit 13 Bit 14 Bit 15 Corresponding Input TMDS Channel B0 B1 B2 B3 A0 A1 A2 A3 C3 C2 C1 C0 D3 D2 D1 D0
INPUT TERMINATION PULSE REGISTER 1 AND REGISTER 2
RX_PT[X]: High Speed (TMDS) Input Channel X Pulse-On-Source Switch Select Bit
Table 17. RX_PT[X] Description
RX_PT[X] 0 1 Description Input termination for TMDS Channel X always connected when source is switched Input termination for TMDS Channel X disconnected for 100 ms when source switched
Table 18. RX_PT[X] Mapping
RX_PT[X] Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 Bit 9 Bit 10 Bit 11 Bit 12 Bit 13 Bit 14 Bit 15 Corresponding Input TMDS Channel B0 B1 B2 B3 A0 A1 A2 A3 C3 C2 C1 C0 D3 D2 D1 D0
TRANSMITTER SETTINGS REGISTER
TX_PE[1:0]: High Speed (TMDS) Output Pre-Emphasis Level Select Bus (For All TMDS Channels)
Table 21. TX_PE[1:0] Description
TX_PE[1:0] 00 01 10 11 Description No pre-emphasis (0 dB) Low pre-emphasis (2 dB) Medium pre-emphasis (4 dB) High pre-emphasis (6 dB)
TX_PTO: High Speed (TMDS) Output Termination On/Off Select Bit (For All Channels)
Table 22. TX_PTO Description
TX_PTO 0 1 Description Output termination off Output termination on
TX_OCL:High Speed (TMDS) Output Current Level Select Bit (For All Channels)
Table 23. TX_OCL Description
TX_OCL 0 1 Description Output current set to 10 mA Output current set to 20 mA
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AD8191 PARALLEL INTERFACE CONFIGURATION REGISTERS
The parallel interface configuration registers can be directly set using the PP_EN, PP_CH[1:0], PP_EQ, PP_PRE[1:0], PP_OTO, and PP_OCL pins. This interface is only accessible after the part is reset and before any registers are accessed using the serial control interface. The state of each pin is set by tying it to 3.3 V (Logic 1) or 0 V (Logic 0). Table 24. Parallel Interface Register Map
Name High Speed Device Modes Auxiliary Device Modes Receiver Settings Bit 7 Bit 6 High speed switch enable PP_EN Auxiliary switch enable 1 Bit 5 Bit 4 High speed switching mode select (quad) 0 0 Auxiliary switching mode select (quad) 0 0 Bit 3 Bit 2 Bit 1 Bit 0 High speed source select PP_CH[1] PP_CH[0] Auxiliary switch source select PP_CH[1]
0
0
Input Termination Pulse 1 Input Termination Pulse 2 Receive Equalizer 1 Receive Equalizer 2 Transmitter Settings
0
PP_CH[0] Input term. on/off select (termination always on) 1 Source A and Source B input termination pulse-on-source switch select (termination always on) 0 0 0 0 0 0 0 Source C and Source D input termination pulse-on-source switch select (termination always on) 0 0 0 0 0 0 0 Source A and Source B input equalization level select PP_EQ PP_EQ PP_EQ PP_EQ Source C and Source D input equalization level select PP_EQ PP_EQ PP_EQ PP_EQ PP_EQ Output pre-emphasis Output level select termination on/off select PP_PE[1] PP_PE[0] PP_OTO PP_EQ
0
0
0
PP_EQ PP_EQ
PP_EQ PP_EQ
PP_EQ PP_EQ Output current level select PP_OCL
HIGH SPEED DEVICE MODES REGISTER
The high speed (TMDS) switching mode is fixed to quad mode when using the parallel interface.
AUXILIARY DEVICE MODES REGISTER
The auxiliary (low speed) switch is always enabled and the auxiliary switching mode is fixed to quad mode when using the parallel interface.
PP_EN: High Speed (TMDS) Channels Enable Bit
Table 25. PP_EN Description
PP_EN 0 1 Description High speed channels off, low power/standby mode High speed channels on
PP_CH[1:0]: Auxiliary Switch Source Select Bus
Table 27. Quad Auxiliary Switch Mode Mapping
PP_CH[1:0] 00 01 10 11 AUX_COM[3:0] AUX_A[3:0] AUX_B[3:0]0 AUX_C[3:0] AUX_D[3:0] Description Auxiliary Source A switched to output Auxiliary Source B switched to output Auxiliary Source C switched to output Auxiliary Source D switched to output
PP_CH[1:0]: High Speed (TMDS) Switch Source Select Bus
Table 26. Quad High speed Switch Mode Mapping
PP_CH[1:0] 00 01 10 11 O[3:0] A[3:0] B[3:0] C[3:0] D[3:0] Description High Speed Source A switched to output High Speed Source B switched to output High Speed Source C switched to output High Speed Source D switched to output
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AD8191
RECEIVER SETTINGS REGISTER
High speed (TMDS) channels input termination is fixed to on when using the parallel interface.
TRANSMITTER SETTINGS REGISTER
PP_PE[1:0]: High Speed (TMDS) Output Pre-Emphasis Level Select Bus (For All TMDS Channels)
Table 29. PP_PE[1:0] Description
PP_PE[1:0] 00 01 10 11 Description No pre-emphasis (0 dB) Low pre-emphasis (2 dB) Medium pre-emphasis (4 dB) High pre-emphasis (6 dB)
INPUT TERMINATION PULSE REGISTER 1 AND REGISTER 2
High speed input (TMDS) channels pulse-on-source switching fixed to off when using the parallel interface.
RECEIVE EQUALIZER REGISTER 1 AND REGISTER 2
PP_EQ: High Speed (TMDS) Inputs Equalization Level Select Bit (For All TMDS Input Channels)
The input equalization cannot be set individually (per channel) when using the parallel interface; one equalization setting affects all input channels. Table 28. PP_EQ Description
PP_EQ 0 1 Description Low equalization (6 dB) High equalization (12 dB)
PP_OTO: High Speed (TMDS) Output Termination On/Off Select Bit (For All TMDS Channels)
Table 30. PP_OTO Description
PP_OTO 0 1 Description Output termination off Output termination on
PP_OCL: High Speed (TMDS) Output Current Level Select Bit (For All TMDS Channels)
Table 31. TX_OCL Description
PP_OCL 0 1 Description Output current set to 10 mA Output current set to 20 mA
Rev. 0 | Page 24 of 32
AD8191 APPLICATION INFORMATION
Figure 31. Layout of the TMDS Traces on the AD8191 Evaluation Board (Only Top Signal Routing Layer is Shown)
The AD8191 is an HDMI/DVI switch featuring equalized TMDS inputs and pre-emphasized TMDS outputs. It is intended for use as a 4:1 switch in systems with long cable runs on both the input and/or the output, and is fully HDMI 1.2a receive-compliant.
and output pre-emphasis of the AD8191 is that the AD8191 can compensate for the signal degradation of both input and output cables; it acts to reopen a closed input data eye and transmit a full-swing HDMI signal to an end receiver. The AD8191 also provides a distinct advantage in receive-type applications because it is a fully buffered HDMI/DVI switch. Although inverting the output pin order of the AD8191 on the PCB requires a designer to place vias in the high speed signal path, the AD8191 fully buffers and electrically decouples the outputs from the inputs. Consequently, the effects of the vias placed on the output signal lines are not seen at the input of the AD8191. The programmable output terminations also improve signal quality at the output of the AD8191. Therefore, the PCB designer has significantly improved flexibility in the placement and routing of the output signal path with the AD8191 over other solutions.
PINOUT
The AD8191 is designed for an HDMI/DVI receiver pinout at its input and a transmitter pinout at its output. This makes the AD8191 ideal for use in AVR-type applications where the designer routes both the inputs and the outputs directly to HDMI/DVI connectors. This type of layout is used on the AD8191 evaluation board, as shown in Figure 31. When the AD8191 is used in receiver type applications, it is necessary to change the ordering of the output pins on the PCB to match up with the on-board receiver. One advantage of the AD8191 in an AVR-type application is that all of the high speed signals can be routed on one side (the topside) of the board, as shown in Figure 31. In addition to 12 dB of input equalization, the AD8191 provides up to 6 dB of output pre-emphasis that boosts the output TMDS signals and allows the AD8191 to precompensate when driving long PCB traces or output cables. The net effect of the input equalization
CABLE LENGTHS AND EQUALIZATION
The AD8191 offers two levels of programmable equalization for the high speed inputs: 6 dB and 12 dB. The equalizer of the AD8191 is optimized for video data rates of 1.65 Gbps. It can equalize up to 20 meters of 24 AWG HDMI cable at data rates corresponding to the video format, 1080p.
Rev. 0 | Page 25 of 32
06123-031
AD8191
The length of cable that can be used in a typical HDMI/DVI application depends on a large number of factors, including: * Cable quality: the quality of the cable in terms of conductor wire gauge and shielding. Thicker conductors have lower signal degradation per unit length. Data rate: the data rate being sent over the cable. The signal degradation of HDMI cables increases with data rate. Edge rates: the edge rates of the source input. Slower input edges result in more significant data eye closure at the end of a cable. Receiver sensitivity: the sensitivity of the terminating receiver. concern with laying out the auxiliary lines is ensuring that they conform to the I2C bus standard and do not have excessive capacitive loading.
TMDS Signals
In the HDMI/DVI standard, four differential pairs carry the TMDS signals. In DVI, three of these pairs are dedicated to carrying RGB video and sync data. For HDMI, audio data is interleaved with the video data; the DVI standard does not incorporate audio information. The fourth high speed differential pair is used for the AV data-word clock, and runs at one-tenth the speed of the TMDS data channels. The four high speed channels of the AD8191 are identical. No concession was made to lower the bandwidth of the fourth channel for the pixel clock, so any channel can be used for any TMDS signal. The user chooses which signal is routed over which channel. Additionally, the TMDS channels are symmetrical; therefore, the p and n of a given differential pair are interchangeable, provided the inversion is consistent across all inputs and outputs of the AD8191. However, the routing between inputs and outputs through the AD8191 is fixed. For example, in quad mode, Output Channel 0 always switches between Input A0, Input B0, Input C0, Input D0, and so forth. The AD8191 buffers the TMDS signals and the input traces can be considered electrically independent of the output traces. In most applications, the quality of the signal on the input TMDS traces are more sensitive to the PCB layout. Regardless of the data being carried on a specific TMDS channel, or whether the TMDS line is at the input or the output of the AD8191, all four high speed signals should be routed on a PCB in accordance with the same RF layout guidelines.
* *
*
As such, specific cable types and lengths are not recommended for use with a particular equalizer setting. In nearly all applications, the AD8191 equalization level can be set to high, or 12 dB, for all input cable configurations at all data rates, without degrading the signal integrity.
PCB LAYOUT GUIDELINES
The AD8191 is used to switch two distinctly different types of signals, both of which are required for HDMI and DVI video. These signal groups require different treatment when laying out a PC board. The first group of signals carries the audiovisual (AV) data. HDMI/DVI video signals are differential, unidirectional, and high speed (up to 1.65 Gbps). The channels that carry the video data must be controlled impedance, terminated at the receiver, and capable of operating up to at least 1.65 Gbps. It is especially important to note that the differential traces that carry the TMDS signals should be designed with a controlled differential impedance of 100 . The AD8191 provides single-ended, 50 terminations on-chip for both its inputs and outputs, and both the input and output terminations can be enabled or disabled through the serial interface. Transmitter termination is not fully specified by the HDMI standard but its inclusion improves the overall system signal integrity. The audiovisual data carried on these high speed channels are encoded by a technique called transmission minimized differential signaling (TMDS) and in the case of HDMI, is also encrypted according to the high bandwidth digital copy protection (HDCP) standard. The second group of signals consists of low speed auxiliary control signals used for communication between a source and a sink. Depending upon the application, these signals can include the DDC bus (this is an I2C bus used to send EDID information and HDCP encryption keys between the source and the sink), the consumer electronics control (CEC) line, and the hot plug detect (HPD) line. These auxiliary signals are bidirectional, low speed, and transferred over a single-ended transmission line that does not need to have controlled impedance. The primary
Layout for the TMDS Signals
The TMDS differential pairs can either be microstrip traces, routed on the outer layer of a board, or stripline traces, routed on an internal layer of the board. If microstrip traces are used, there should be a continuous reference plane on the PCB layer directly below the traces. If stripline traces are used, they must be sandwiched between two continuous reference planes in the PCB stack-up. Additionally, the p and n of each differential pair must have a controlled differential impedance of 100 . The characteristic impedance of a differential pair is a function of several variables including the trace width, the distance separating the two traces, the spacing between the traces and the reference plane, and the dielectric constant of the PC board binder material. Interlayer vias introduce impedance discontinuities that can cause reflections and jitter on the signal path, therefore, it is preferable to route the TMDS lines exclusively on one layer of the board, particularly for the input traces. In some applications, such as using multiple AD8191s to construct large input arrays, the use of interlayer vias becomes unavoidable. In these situations, the input termination feature of the AD8191 improves system signal integrity by absorbing reflections. Take care to use vias minimally and to place vias symmetrically for each side of a given differential
Rev. 0 | Page 26 of 32
AD8191
pair. Furthermore, to prevent unwanted signal coupling and interference, route the TMDS signals away from other signals and noise sources on the PCB. Both traces of a given differential pair must be equal in length to minimize intrapair skew. Maintaining the physical symmetry of a differential pair is integral to ensuring its signal integrity; excessive intrapair skew can introduce jitter through duty cycle distortion (DCD). The p and n of a given differential pair should always be routed together to establish the required 100 differential impedance. Enough space should be left between the differential pairs of a given group so that the n of one pair does not couple to the p of another pair. For example, one technique is to make the interpair distance 4 to 10 times wider than the intrapair spacing. Any group of four TMDS channels (Input A, Input B, Input C, Input D, or the output) should have closely matched trace lengths to minimize interpair skew. Severe interpair skew can cause the data on the four different channels of a group to arrive out of alignment with one another. A good practice is to match the trace lengths for a given group of four channels to within 0.05 inches on FR4 material. The length of the TMDS traces should be minimized to reduce overall signal degradation. Commonly used PC board material, such as FR4, is lossy at high frequencies; therefore, long traces on the circuit board increase signal attenuation resulting in decreased signal swing and increased jitter through intersymbol interference (ISI).
TMDS Terminations
The AD8191 provides internal, 50 single-ended terminations for all of its high speed inputs and outputs. It is not necessary to include external termination resistors for the TMDS differential pairs on the PCB. The output termination resistors of the AD8191 back-terminate the output TMDS transmission lines. These back-terminations act to absorb reflections from impedance discontinuities on the output traces, improving the signal integrity of the output traces and adding flexibility to how the output traces can be routed. For example, interlayer vias can be used to route the AD8191 TMDS outputs on multiple layers of the PCB without severely degrading the quality of the output signal.
Auxiliary Control Signals
There are four single-ended control signals associated with each source or sink in an HDMI/DVI application. These are hot plug detect (HPD), consumer electronics control (CEC), and two display data channel (DDC) lines. The two signals on the DDC bus are SDA and SCL (serial data and serial clock, respectively). These four signals can be switched through the auxiliary bus of the AD8191 and do not need to be routed with the same strict considerations as the high speed TMDS signals. In general, it is sufficient to route each auxiliary signal as a single-ended trace. These signals are not sensitive to impedance discontinuities, do not require a reference plane, and can be routed on multiple layers of the PCB. However, it is best to follow strict layout practices whenever possible to prevent the PCB design from affecting the overall application. The specific routing of the HPD, CEC, and DDC lines depends upon the application in which the AD8191 is being used. For example, the maximum speed of signals present on the auxiliary lines is 100 kHz I2C data on the DDC lines; therefore, any layout that enables 100 kHz I2C to be passed over the DDC bus should suffice. The HDMI 1.2a specification, however, places a strict 50 pF limit on the amount of capacitance that can be measured on either SDA or SCL at the HDMI input connector. This 50 pF limit includes the HDMI connector, the PCB, and whatever capacitance is seen at the input of the AD8191, or an equivalent receiver. There is a similar limit of 100 pF of input capacitance for the CEC line. The parasitic capacitance of traces on a PCB increases with trace length. To help ensure that a design satisfies the HDMI specification, the length of the CEC and DDC lines on the PCB should be made as short as possible. Additionally, if there is a reference plane in the layer adjacent to the auxiliary traces in the PCB stack-up, relieving or clearing out this reference plane immediately under the auxiliary traces significantly decreases the amount of parasitic trace capacitance. An example of the board stackup is shown in Figure 32.
Controlling the Characteristic Impedance of a TMDS Differential Pair
The characteristic impedance of a differential pair depends on a number of variables including the trace width, the distance between the two traces, the height of the dielectric material between the trace and the reference plane below it, and the dielectric constant of the PCB binder material. To a lesser extent, the characteristic impedance also depends upon the trace thickness and the presence of solder mask. There are many combinations that can produce the correct characteristic impedance. It is generally required to work with the PC board fabricator to obtain a set of parameters to produce the desired results. One consideration is how to guarantee a differential pair with a differential impedance of 100 over the entire length of the trace. One technique to accomplish this is to change the width of the traces in a differential pair based on how closely one trace is coupled to the other. When the two traces of a differential pair are close and strongly coupled, they should have a width that produces a 100 differential impedance. When the traces split apart, to go into a connector, for example, and are no longer so strongly coupled, the width of the traces should be increased to yield a differential impedance of 100 in the new configuration.
Rev. 0 | Page 27 of 32
AD8191
3W W 3W
Power Supplies
The AD8191 has five separate power supplies referenced to two separate grounds. The supply/ground pairs are: * * * AVCC/AVEE VTTI/AVEE VTTO/AVEE DVCC/DVEE AMUXVCC/DVEE
SILKSCREEN LAYER 1: SIGNAL (MICROSTRIP) PCB DIELECTRIC LAYER 2: GND (REFERENCE PLANE) PCB DIELECTRIC LAYER 3: PWR (REFERENCE PLANE) PCB DIELECTRIC LAYER 4: SIGNAL (MICROSTRIP) SILKSCREEN
06123-010
* *
REFERENCE LAYER RELIEVED UNDERNEATH MICROSTRIP
Figure 32. Example Board Stackup
HPD is a dc signal presented by a sink to a source to indicate that the source EDID is available for reading. The placement of this signal is not critical, but it should be routed as directly as possible. When the AD8191 is powered up, one set of the auxiliary inputs is passively routed to the outputs. In this state, the AD8191 looks like a 100 resistor between the selected auxiliary inputs and the corresponding outputs as illustrated in Figure 27. The AD8191 does not buffer the auxiliary signals, therefore, the input traces, output traces, and the connection through the AD8191 all must be considered when designing a PCB to meet HDMI/DVI specifications. The unselected auxiliary inputs of the AD8191 are placed into a high impedance mode when the device is powered up. To ensure that all of the auxiliary inputs of the AD8191 are in a high impedance mode when the device is powered off, it is necessary to power the AMUXVCC supply as illustrated in Figure 28. In contrast to the auxiliary signals, the AD8191 buffers the TMDS signals, allowing a PCB designer to layout the TMDS inputs independently of the outputs.
The AVCC/AVEE (3.3 V) and DVCC/DVEE (3.3 V) supplies power the core of the AD8191. The VTTI/AVEE supply (3.3 V) powers the input termination (see Figure 25). Similarly, the VTTO/AVEE supply (3.3 V) powers the output termination (see Figure 26). The AMUXVCC/DVEE supply (3.3 V to 5 V) powers the auxiliary multiplexer core and determines the maximum allowed voltage on the auxiliary lines. For example, if the DDC bus is using 5 V I2C, then AMUXVCC should be connected to +5 V relative to DVEE. In a typical application, all pins labeled AVEE or DVEE should be connected directly to ground. All pins labeled AVCC, DVCC, VTTI, or VTTO should be connected to 3.3 V, and Pin AMUXVCC tied to 5 V. The supplies can also be powered individually, but care must be taken to ensure that each stage of the AD8191 is powered correctly.
Power Supply Bypassing
The AD8191 requires minimal supply bypassing. When powering the supplies individually, place a 0.01 F capacitor between each 3.3 V supply pin (AVCC, DVCC, VTTI, and VTTO) and ground to filter out supply noise. Generally, bypass capacitors should be placed near the power pins and should connect directly to the relevant supplies (without long intervening traces). For example, to improve the parasitic inductance of the power supply decoupling capacitors, minimize the trace length between capacitor landing pads and the vias as shown in Figure 33.
RECOMMENDED
EXTRA ADDED INDUCTANCE
NOT RECOMMENDED
Figure 33. Recommended Pad Outline for Bypass Capacitors
Rev. 0 | Page 28 of 32
06123-033
AD8191
In applications where the AD8191 is powered by a single 3.3 V supply, it is recommended to use two reference supply planes and bypass the 3.3 V reference plane to the ground reference plane with one 220 pF, one 1000 pF, two 0.01 F, and one 4.7 F capacitors. The capacitors should via down directly to the supply planes and be placed within a few centimeters of the AD8191. The AMUXVCC supply does not require additional bypassing. This bypassing scheme is illustrated in Figure 34.
AUXILIARY LINES TMDS TRACES DECOUPLING CAPACITORS
AD8191
Figure 34. Example Placement of Power Supply Decoupling Capacitors Around the AD8191
Rev. 0 | Page 29 of 32
06123-034
AD8191 OUTLINE DIMENSIONS
1.60 MAX 0.75 0.60 0.45
100 1 PIN 1
16.20 16.00 SQ 15.80
76 75
(PINS DOWN)
TOP VIEW
14.20 14.00 SQ 13.80
1.45 1.40 1.35
0.15 0.05
SEATING PLANE
0.20 0.09 7 3.5 0 0.08 COPLANARITY
25 26
51 50
VIEW A
0.50 BSC LEAD PITCH
VIEW A
ROTATED 90 CCW
0.27 0.22 0.17
051706-A
COMPLIANT TO JEDEC STANDARDS MS-026-BED
Figure 35. 100-Lead Low Profile Quad Flat Package [LQFP] (ST-100) Dimensions shown in millimeters
ORDERING GUIDE
Model AD8191ASTZ 1 AD8191ASTZ-RL1 AD8191-EVAL
1
Temperature Range -40C to +85C -40C to +85C
Package Description 100-Lead Low Profile Quad Flat Package [LQFP] 100-Lead Low Profile Quad Flat Package [LQFP], Reel Evaluation Kit
Package Option ST-100 ST-100
Ordering Quantity 1,000
Z = Pb-free part.
Rev. J | Page 30 of 32
AD8191 NOTES
Rev. 0 | Page 31 of 32
AD8191 NOTES
Purchase of licensed I2C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips.
(c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06123-0-10/06(0)
Rev. 0 | Page 32 of 32

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