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12-Channel Gamma Buffers with VCOM Buffer ADD8701
FEATURES Single-Supply Operation: 7 V to 16 V Dual-Supply Operation: 3.5 V to 8 V Supply Current: 13 mA Max Upper/Lower Buffers Swing to VDD/GND Continuous Output Current: 10 mA VCOM Peak Output Current: 250 mA Offset Voltage: 15 mV Max Slew Rate: 6 V/ s Fast Settling Time with Large C-Load APPLICATIONS TFT LCD Panels
FUNCTIONAL BLOCK DIAGRAM
VCOM OUT
GND
V12
V11
V10
V9
V8
26
32
31
30
26
28
27
25
24 GND
23 VDD
22 V6
21 V5
20 V4
19 V3
18 V2
17 V1
VDD VCOM IN IN12 IN11 IN10 IN9 IN8 IN7
1
2
3
4
5
6
7
8
The ADD8701 is a low cost, 12-channel buffer amplifier and VCOM driver that operates from a single supply. The part is designed for high resolution TFT LCD panels, and is built on an advanced, high voltage, CBCMOS process. The buffers have high slew rate, 10 mA continuous output current, and high capacitive load drive capability. The VCOM buffer has increased drive of 35 mA and can drive large capacitive loads. The ADD8701 offers wide supply range and offset voltages below 15 mV.
The ADD8701 is specified over the -40C to +85C temperature range and is available in a 32-lead lead frame chip scale package (LFCSP). All inputs and outputs incorporate internal ESD protection circuits.
GND
IN6
IN5
IN4
IN3
IN2
IN1
VDD
GENERAL DESCRIPTION
9
10
11
12
13
14
15
16
V7
VDD V12 TIMING AND CONTROL GAMMA REFERENCE VOLTAGES
PANEL TIMING CONTROLLER
SCAN DRIVER CONTROL
SOURCE DRIVER NO. 1 384
SOURCE DRIVER NO. 2 384
SOURCE DRIVER NO. 8 384
ADD8701
RESISTOR LADDER
RGB
SCAN DRIVERS 768
TFT COLOR PANEL 1024 768
VCOM OUT
V1 GND
VCOM IN VDD
Figure 1. Typical SVGA TFT-LCD Application
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. 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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 (c) 2003 Analog Devices, Inc. All rights reserved.
ADD8701-SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (7 V V
Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Voltage Range Input Impedance Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High (V11, V12) Symbol VOS VOS/T IB ZIN CIN VOUT IL = 100 A VDD = 16 V, IL = 5 mA -40C TA +85C VDD = 7 V, IL = 5 mA -40C TA +85C IL = 5 mA, VDD = 16 V IL = 5 mA, VDD = 7 V IL = 100 A VDD = 16 V, IL = 5 mA -40C TA +85C VDD = 7 V, IL = 5 mA -40C TA +85C VDD = 16 V
DD
16 V, TA = 25C, unless otherwise specified.)
Min Typ 4 5 0.5 -0.5 400 1 15.995 15.9 6.85 14.6 5.6 5 85 140 10 150 35 250 0.995 0.995 0.9985 1.005 0.9980 1.005 0.01 7 16 90 10 Max 15 1.1 1.5 VDD + 0.5 Unit mV V/C A A V k pF V V V V V V V mV mV mV mV mV mA mA mA mA V/V V/V % V dB mA mA V/s MHz s s Degrees dB nV/Hz nV/Hz pA/Hz
Condition
-40C TA +85C -40C TA +85C
15.85 15.75 6.75 6.65
Output Swing (V3 to V10) Output Swing (V3 to V10) Output Voltage Low (V1, V2)
VOUT VOUT VOUT
150 250 300 400
Continuous Output Current Peak Output Current VCOM CHARACTERISTICS Continuous Output Current Peak Output Current TRANSFER CHARACTERISTICS Gain Gain Linearity SUPPLY CHARACTERISTICS Supply Voltage Power Supply Rejection Ratio Supply Current DYNAMIC PERFORMANCE Slew Rate Bandwidth Settling Time to 0.1% (Buffers) Settling Time to 0.1% (VCOM) Phase Margin Channel Separation NOISE PERFORMANCE Voltage Noise Density Current Noise Density
Specifications subject to change without notice.
IOUT IPK IOUT IPK AVCL NL
VDD = 16 V RL = 2 k -40C TA +85C RL = 10 k VO = 0.5 to (VDD - 0.5 V)
VDD PSRR ISYS
VDD = 6 V to 17 V -40C TA +85C No Load -40C TA +85C RL = 10 k, CL = 200 pF -3 dB, RL = 10 k, CL = 200 pF 1 V, RL = 10 k, CL = 200 pF 1 V, RL = 10 k, CL = 200 pF RL = 10 k, CL = 200 pF
70
13 15
SR BW tS tS fo
4
6 4.5 1.1 0.7 55 75 26 25 0.8
en en in
f = 1 kHz f = 10 kHz f = 10 kHz
-2-
REV. 0
ADD8701
ABSOLUTE MAXIMUM RATINGS* PIN CONFIGURATION
32 VCOM OUT 31 GND 30 V12 29 V11 28 V10 27 V9 26 V8 25 V7
VDD 1 VCOM IN 2 IN12 3 IN11 4 IN10 5 IN9 6 IN8 7 IN7 8
PIN 1 INDICATOR
Supply Voltage (VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Input Voltage . . . . . . . . . . . . . . . . . . . . . -0.5 V to VDD + 0.5 V Storage Temperature Range . . . . . . . . . . . . . -65C to +150C Operating Temperature Range . . . . . . . . . . . . -40C to +85C Junction Temperature Range . . . . . . . . . . . . . -65C to +150C Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300C ESD Tolerance (HBM) . . . . . . . . . . . . . . . . . . . . . . . 1,000 V
*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 sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ADD8701
TOP VIEW
24 GND 23 VDD 22 V6 21 V5 20 V4 19 V3 18 V2 17 V1
Package Type 32-Lead LFCSP (CP)
JA
1
JB
2
Unit C/W Pin No. 1, 15, 23 2 3-14 Package Option 16, 24, 31 17-22, 25-30 32
35
13
PIN FUNCTION DESCRIPTION
NOTES 1 JA is specified for worst-case conditions, i.e., JA is specified for device soldered in circuit board for surface-mount packages. 2 JB is applied for calculating the junction temperature by reference to the board temperature.
Mnemonic VDD VCOM IN IN12-IN1 GND V1-V12 VCOM OUT
ORDERING GUIDE
Model
Temperature Range
Package Description
ADD8701ACP -40C to +85C
32-Lead LFCSP CP-32
CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADD8701 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
REV. 0
-3-
IN6 9 IN5 10 IN4 11 IN3 12 IN2 13 IN1 14 VDD 15 GND 16
Description Power (+) VCOM Buffer Input Gamma Buffer Inputs Power (-) Gamma Buffer Outputs VCOM Buffer Output
ADD8701-Typical Performance Characteristics
1,400 1,200 TA = 25 C 7V < V DD < 16V
NUMBER OF AMPLIFIERS
7,000 7V < VDD < 16V
INPUT OFFSET VOLTAGE - mV
20 7V < VDD < 16V 15 10 VCOM 5 0 -5 -10 -15 -20 -40 BUFFER 12 BUFFER 1
6,000 5,000 4,000 3,000 2,000 1,000 0
NUMBER OF AMPLIFIERS
1,000 800 600 400 200 0 -7 -5 -3 -1 1 3 5 7 INPUT OFFSET VOLTAGE - mV 9
5
10
15 20 25 30 TCVOS - V/ C
35
40
25 TEMPERATURE - C
85
TPC 1. Input Offset Voltage Distribution
TPC 2. TCVOS Distribution
TPC 3. Input Offset Voltage vs. Temperature
8 6
OFFSET VOLTAGE - mV
8 VDD = 8V BUFFERS 10 TO 12
OFFSET VOLTAGE - mV
0
6 4 2 0 -2 -4 -6 -8
VDD = 8V VCOM, BUFFERS 1 TO 9
INPUT BIAS CURRENT - nA
VCOM AND BUFFERS 1 TO 9 -100 -200 -300 -400 -500 -600 -700 -800 VDD = 7V VDD = 16V
4 2 0 -2 -4 -6 -8 -10 -8 -6 -4 -2 0 2 4 6 COMMON-MODE VOLTAGE - V 8
-10 -8
-6
-4 -2 0 2 4 6 COMMON-MODE VOLTAGE - V
8
-900 -40
25 TEMPERATURE - C
85
TPC 4. Offset Voltage vs. Common-Mode Voltage
TPC 5. Offset Voltage vs. Common-Mode Voltage
TPC 6. Input Bias Current vs. Temperature
350 BUFFERS 10 TO 12 300
INPUT BIAS CURRENT - nA
100 VDD = 16V BUFFERS 1, 2 10
100 VDD = 16V BUFFERS 3 TO 9 10
OUTPUT VOLTAGE - V
250 VDD = 7V 200 VDD = 16V 150 100 50 0 -40
SOURCE 1
OUTPUT VOLTAGE - V
SOURCE 1 SINK 0.1
0.1 SINK 0.01
0.01
25 TEMPERATURE - C
85
0.001 0.01
0.1 1 10 LOAD CURRENT - mA
100
0.001 0.01
0.1 1 10 LOAD CURRENT - mA
100
TPC 7. Input Bias Current vs. Temperature
TPC 8. Output Voltage to Supply Rail vs. Load Current
TPC 9. Output Voltage to Supply Rail vs. Load Current
-4-
REV. 0
ADD8701
100 VDD = 16V BUFFER 10 10
10 100 VDD = 16V BUFFERS 11, 12
10 VDD = 16V VCOM 1
SINK
OUTPUT VOLTAGE - V
OUTPUT VOLTAGE - V
1
SINK
1
OUTPUT VOLTAGE - V
SOURCE
0.1 SINK 0.01
SOURCE 0.1
0.1 SOURCE 0.01
0.01
0.001
0.001 0.01
0.1 1 10 LOAD CURRENT - mA
100
0.001 0.01
0.1 1 10 LOAD CURRENT - mA
100
0.0001 0.01
0.1 1 10 LOAD CURRENT - mA
100
TPC 10. Output Voltage to Supply Rail vs. Load Current
TPC 11. Output Voltage to Supply Rail vs. Load Current
TPC 12. Output Voltage to Supply Rail vs. Load Current
12 VCM = 1/2 VDD 10
SUPPLY CURRENT - mA SUPPLY CURRENT - mA
12 VDD = 16V 10 VDD = 7V
GAIN - dB
20 VDD = 16V VCOM AND BUFFERS 1 TO 9 10 10k 2k 1k 560
8
8
0
6
6
-10 150 -20
4
4
2
2
0
0
4 8 12 SUPPLY VOLTAGE - V
16
0 -40
25 TEMPERATURE - C
85
-30 100k
1M FREQUENCY - Hz
10M
30M
TPC 13. Supply Current vs. Supply Voltage
TPC 14. Supply Current vs. Temperature
TPC 15. Frequency Response vs. Resistive Loading
POWER SUPPLY REJECTION RATIO - dB
20 VDD = 16V BUFFERS 10 TO 12 10 10k 2k 1k 560
80 60 40 20
ALL CHANNELS VDD = 8V TA = +25 C
20 10 0
GAIN - dB
VDD = 16V VCOM, BUFFERS 1 TO 9 100pF
GAIN - dB
0
0 -20 -40 PSRR -60 -80
-10 540pF -20 -30 -40 1040pF
50pF
-10 150 -20
-100 -120 100 1k 10k 100k FREQUENCY - Hz 1M 10M
-30 100k
1M FREQUENCY - Hz
10M
30M
-50 100k
1M FREQUENCY - Hz
10M
30M
TPC 16. Frequency Response vs. Resistive Loading
TPC 17. Power Supply Rejection Ratio vs. Frequency
TPC 18. Frequency Response vs. Capacitive Loading
REV. 0
-5-
ADD8701
20 10 0 VDD = 16V BUFFERS 10 TO 12
180 160 PHASE SHIFT - Degrees
100pF
VDD = 7V RL = 2k
180 CHANNELS 11 AND 12 160 PHASE SHIFT - Degrees 140 VCOM 120 CHANNEL 1 100 80 60 40 CHANNEL 3 VDD = 16V RL = 2k CHANNEL 11
140 VCOM 120 CHANNELS 1 AND 2 100 80 60 40 CHANNELS 3 TO 9
GAIN - dB
-10 -20 -30 -40 -50 100k 540pF 1040pF
50pF
1M FREQUENCY - Hz
10M
30M
0
200
400 600 800 1,000 CAPACITIVE LOAD - pF
1,200
0
200
400 600 800 1,000 CAPACITIVE LOAD - pF
1,200
TPC 19. Frequency Response vs. Capacitive Loading
TPC 20. Input-Output Phase Shift vs. Capacitive Load
TPC 21. Input-Output Phase Shift vs. Capacitive Load
VDD = 16V
16 14 VDD = 16V RNULL = 33 CL = 100pF
VOLTAGE - 20mV/DIV
VOLTAGE - 2V/DIV
12
SLEW RATE - V/ s
10 VCOM SLEW RATE FALLING 8 VCOM SLEW RATE RISING 6 4 2 0 -40
7V < VDD < 16V ROUT SERIES = 33 CLOAD = 0.1 F 25 TEMPERATURE - C 85 TIME - 20 s/DIV
TIME - 2 s/DIV
TPC 22. Large-Signal Transient Response
TPC 23. Slew Rate vs. Temperature
TPC 24. Small Signal Transient Response
100 90 80
OVERSHOOT - %
60 50 40 30 20 10 0 10
+OS
STEP SIZE - V
-OS
4
0
-4 -tS (0.1%) -8
100 1k CAPACITIVE LOAD - pF
10k
-12 400
600
800 1,000 1,200 SETTLING TIME - ns
1,400
TIME - 40 s/DIV
TPC 25. Small-Signal Overshoot vs. Capacitive Load
TPC 26. Settling Time vs. Step Size
VOLTAGE - 3V/DIV
70
VDD = 8V VIN = 50mV RL = 2k TA = 25 C
12 VCOM VDD = 8V RL = 5k CL = 100pF RNULL = 33 TA = 25 C
8
+tS (0.1%)
TPC 27. No Phase Reversal
-6-
REV. 0
ADD8701
70 70
VOLTAGE NOISE DENSITY - nV/ Hz
VOLTAGE NOISE DENSITY - nV/ Hz
60 50 40 30 20 10 0 -10
VDD = 16V VCOM AND BUFFERS 1 TO 9 MARKER SET @ 10kHz MARKER READING = 25.7nV/ Hz
60 50 40 30 20 10 0 -10
VDD = 16V BUFFERS 10 TO 12 MARKER SET @ 10kHz MARKER READING = 36.6nV/ Hz
0
5
10 15 FREQUENCY - Hz
20
25
0
5
10 15 FREQUENCY - Hz
20
25
TPC 28. Voltage Noise Density vs. Frequency
APPLICATIONS LCD Gamma Reference Buffers
TPC 29. Voltage Noise Density vs. Frequency
A10
GMA
The ADD8701 is designed to meet the rail-to-rail capability needed by the application and yet offers a low cost-per-channel solution. The design maximizes the die area by offering channels to swing to the positive and negative rails. It is imperative that the channels swinging close to the supply rail be used for the positive gamma references and that the channels swinging close to GND be used for the negative gamma references. See Figure 2 for an example of the application circuit.
LCD VCOM Buffer
A9
GMA
A8
GMA
A7
GMA
A4
GMA
Unused Buffers
Inputs of any unused buffer should be tied to the ground plane.
A3 GMA
A2
GMA
A1
GMA
ADD8701
LCD SOURCE DRIVER
Figure 2. Application Circuit
REV. 0
-7-
NEGATIVE GAMMA REFERENCES
The output of the VCOM buffer is designed to control the voltage on the back plate of the LCD display. The buffer must be capable of sinking and sourcing capacitive pulse current. The amplifier stability is designed for high load capacitance. A high quality ceramic capacitor is recommended to supply short duration current pulses at the output. The VCOM buffer of the ADD8701 can handle up to 35 mA of continuous output current and can drive up to 1,000 nF of pure capacitive load.
A6
GMA
A5
GMA
POSITIVE GAMMA REFERENCES
In high resolution TFT-LCD displays, gamma correction must be performed to correct the nonlinearity in the LCD panel's transmission characteristics. A typical TFT-LCD panel consisting of 256 grayscale levels takes an 8-bit digital word to select an appropriate gamma reference voltage. An 8-bit source driver may use 12 analog voltages that match the characteristic gamma curve for optimum panel picture quality. The ADD8701 is specifically designed to generate analog reference voltages to meet the gamma characteristics of an LCD panel used by the source driver. The gamma reference buffers offer 10 mA drive capability.
A12
GMA
A11
GMA
ADD8701
OUTLINE DIMENSIONS
32-Lead Lead Frame Chip Scale Package [LFCSP] (CP-32)
Dimensions shown in millimeters
5.00 BSC SQ
0.60 MAX 0.60 MAX
25 24 32 1
PIN 1 INDICATOR
PIN 1 INDICATOR
TOP VIEW
4.75 BSC SQ
0.50 BSC
BOTTOM VIEW
3.25 3.10 SQ 2.95
8
0.50 0.40 0.30 12 MAX 0.80 MAX 0.65 NOM 0.05 MAX 0.02 NOM SEATING PLANE 0.30 0.23 0.18 0.20 REF COPLANARITY 0.08
17 16
9
3.50 REF
1.00 0.90 0.80
COMPLIANT TO JEDEC STANDARDS MO-220-VHHD-2
-8-
REV. 0
C03599-0-4/03(0)
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