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a
FEATURES Supports DOCSIS Standard for Reverse Path Transmission Gain Programmable in 0.75 dB Steps over a 53.5 dB Range Low Distortion at 65 dBmV Output -62 dBc SFDR at 21 MHz -58 dBc SFDR at 65 MHz 1 dB Compression of 25 dBm at 10 MHz Output Noise Level -45 dBmV in 160 kHz Maintains 75 Output Impedance Power-Up and Power-Down Condition Upper Bandwidth: 100 MHz (Full Gain Range) Single or Dual Supply Operation APPLICATIONS Gain-Programmable Line Driver CATV Telephony Modems CATV Terminal Devices General-Purpose Digitally Controlled Variable Gain Block
High Output Power Programmable CATV Line Driver AD8326
FUNCTIONAL BLOCK DIAGRAM
VCC (7 PINS) BYP
AD8326
VIN+ DIFF OR SINGLE INPUT AMP VOUT+ VERNIER
ATTENUATION CORE
POWER AMP VOUT-
ZOUT DIFF = 75
VIN-
8 DECODE
ZIN (SINGLE) = 800 ZIN (DIFF) = 1.6k
8 DATA LATCH 8
SHIFT REGISTER
POWER-DOWN LOGIC
GND
DATEN
DATA
CLK
VEE (10 PINS)
TXEN
SLEEP
-40 -45 -50 DISTORTION - dBc -55 ARP(VO = 67dBmV) -60 -65 -70 ARE(VO = 62dBmV) -75 -80 5 15 25 35 45 55 65 FREQUENCY - MHz ARE(VO = 65dBmV) ARP(VS = +12V) ARE(VS = 5V)
ARP(VO = 69dBmV)
GENERAL DESCRIPTION
The AD8326 is a high-output power, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as data and telephony cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 53.5 dB range resulting in gain changes of 0.75 dB/LSB. The AD8326 is offered in two models, each optimized to support the desired output power and resulting performance. The AD8326 comprises a digitally controlled variable attenuator of 0 dB to -54 dB, that is preceded by a low noise, fixed-gain buffer and is followed by a low distortion high-power amplifier. The AD8326 accepts a differential or single-ended input signal. The output is designed to drive a 75 load, such as coaxial cable, although the AD8326 is capable of driving other loads. When driving 67 dBm into a 75 load, the AD8326ARP provides a worst harmonic of only -59 dBc at 21 MHz and -57 dBc at 42 MHz. When driving 65 dBmV into a 75 load, the AD8326ARE provides a worst harmonic of only -62 dBc at 21 MHz and -60 dBc at 42 MHz.
Figure 1. Worst Harmonic Distortion vs. Frequency
The differential output of the AD8326 is compliant with DOCSIS paragraph 4.2.10.2 for "Spurious Emissions During Burst On/Off Transients." In addition, this device has a sleep mode function that reduces the quiescent current to 4 mA. The AD8326 is packaged in a low-cost 28-lead TSSOP and a 28-lead P (power) SOIC. Both devices have an operational temperature range of -40C to +85C.
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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. 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) Analog Devices, Inc., 2001
AD8326-SPECIFICATIONS transformer with an insertion loss of 0.5 dB @ 10 MHz, unless otherwise noted.)
AD8326ARP
Parameter INPUT CHARACTERISTICS Specified AC Voltage Noise Figure Input Resistance Input Capacitance GAIN CONTROL INTERFACE Gain Range Maximum Gain Minimum Gain Gain Scaling Factor Gain Linearity Error OUTPUT CHARACTERISTICS Bandwidth (-3 dB) Bandwidth Roll-Off Bandwidth Peaking Output Noise Spectral Density 52.5 26.5 -27 Conditions Output = 67 dBmV, Max Gain Max Gain, f = 10 MHz Differential Input Single-Ended Input Min Typ 259 16.6 1600 800 2 53.5 27.5 -26 0.7526 0.2 100 1.2 0 -28 -45.5 -65 26.5 75 20% -59 -59 -57 -55 -56 54.5 28.5 -25 Max Unit
(TA = 25 C, VS = 12 V, RL = RIN = 75
, VIN = 259 mV p-p, VOUT measured through a 1:1
mV p-p dB pF dB dB dB dB/LSB dB MHz dB dB dBmV in 160 kHz dBmV in 160 kHz dBmV in 160 kHz dBm dBc dBc dBc dBc dBc
Gain Code = 71 Dec Gain Code = 0 Dec f = 10 MHz, Code-to-Code All Gain Codes f = 65 MHz f = 65 MHz Max Gain, f = 10 MHz Min Gain, f = 10 MHz Transmit Disable Mode, f = 10 MHz
1 dB Compression Point Differential Output Impedance OVERALL PERFORMANCE Worst Harmonic Distortion
Max Gain, f = 10 MHz Transmit Enable and Transmit Disable Mode f = 14 MHz, VOUT = 67 dBmV @ Max Gain f = 21 MHz, VOUT = 67 dBmV @ Max Gain f = 42 MHz, VOUT = 67 dBmV @ Max Gain f = 65 MHz, VOUT = 67 dBmV @ Max Gain 16 QAM, VOUT = 67 dBmV Adj Ch Wid = Tr Ch Wid = 160 KSYM/SEC Min to Max Gain Max Gain, VIN = 0 V to 0.25 V p-p Min Gain, TXEN = 0, 65 MHz, V IN = 0.25 V p-p Max Gain, TXEN = 0, 42 MHz, V IN = 0.25 V p-p Max Gain, TXEN = 0, 65 MHz, V IN = 0.25 V p-p All Gains, SLEEP, 65 MHz, V IN = 0.25 V p-p
Adjacent Channel Power Output Settling Due to Gain Change (TGS) Due to Input Step Change Signal Isolation
60 30 -85 -31 -28 -85 250 40 5 60 11.4 147 38 1.5 -40 12 157 44 4.5 12.6 167 50 7.5 +85
ns ns dBc dBc dBc dBc ns ns mV p-p mV p-p V mA mA mA C
POWER CONTROL Transmit Enable Response Time (t ON) Max Gain, VIN = 0 Transmit Disable Response Time (t OFF) Max Gain, VIN = 0 Equivalent Output = 31 dBmV Between Burst Transients1 Equivalent Output = 61 dBmV POWER SUPPLY Operating Range Quiescent Current
Transmit Enable Mode (TXEN = 1) Transmit Disable Mode (TXEN = 0) Sleep Mode
OPERATING TEMPERATURE RANGE
NOTES 1 Between Burst Transients measured at the output of diplexer. Specifications subject to change without notice.
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AD8326
= V, R = = V p-p, V SPECIFICATIONS (T = 25 C, Vwith an5 insertionR loss75 0.5, VdB = 206 MHz, unlessmeasured through a 1:1 transformer of @ 10 otherwise noted.)
A S L IN IN OUT
AD8326ARE
Parameter INPUT CHARACTERISTICS Specified AC Voltage Noise Figure Input Resistance Input Capacitance GAIN CONTROL INTERFACE Gain Range Maximum Gain Minimum Gain Gain Scaling Factor Gain Linearity Error OUTPUT CHARACTERISTICS Bandwidth (-3 dB) Bandwidth Roll-Off Bandwidth Peaking Output Noise Spectral Density 52.5 26.5 -27 Conditions Output = 65 dBmV, Max Gain Max Gain, f = 10 MHz Differential Input Single-Ended Input Min Typ 206 16.6 1600 800 2 53.5 27.5 -26 0.7526 0.2 100 1.1 0 -28 -45.5 -65 25.0 75 20% -62 -62 -60 -58 -58 54.5 28.5 -25 Max Unit mV p-p dB pF dB dB dB dB/LSB dB MHz dB dB dBmV in 160 kHz dBmV in 160 kHz dBmV in 160 kHz dBm dBc dBc dBc dBc dBc
Gain Code = 71 Dec Gain Code = 0 Dec f = 10 MHz, Code-to-Code All Gain Codes f = 65 MHz f = 65 MHz Max Gain, f = 10 MHz Min Gain, f = 10 MHz Transmit Disable Mode, f = 10 MHz
1 dB Compression Point Differential Output Impedance OVERALL PERFORMANCE Worst Harmonic Distortion
Max Gain, f = 10 MHz Transmit Enable and Transmit Disable Mode f = 14 MHz, V OUT = 65 dBmV @ Max Gain f = 21 MHz, V OUT = 65 dBmV @ Max Gain f = 42 MHz, V OUT = 65 dBmV @ Max Gain f = 65 MHz, V OUT = 65 dBmV @ Max Gain 16 QAM, VOUT = 65 dBmV Adj Ch Wid = Tr Ch Wid = 160 KSYM/SEC Min to Max Gain Max Gain, VIN = 0 V to 0.19 V p-p Min Gain, TXEN = 0, 65 MHz, V IN = 0.19 V p-p Max Gain, TXEN = 0, 42 MHz, V IN = 0.19 V p-p Max Gain, TXEN = 0, 65 MHz, V IN = 0.19 V p-p All Gains, SLEEP, 65 MHz, V IN = 0.19 V p-p
Adjacent Channel Power Output Settling Due to Gain Change (T GS) Due to Input Step Change Signal Isolation
60 30 -85 -31 -28 -85 250 40 5 60 4.75 140 36 1 -40 5.0 150 42 4 5.25 160 48 7 +85
ns ns dBc dBc dBc dBc ns ns mV p-p mV p-p V mA mA mA C
POWER CONTROL Transmit Enable Response Time (t ON) Max Gain, VIN = 0 Transmit Disable Response Time (t OFF) Max Gain, VIN = 0 Equivalent Output = 31 dBmV Between Burst Transients 1 Equivalent Output = 61 dBmV POWER SUPPLY Operating Range Quiescent Current
Transmit Enable Mode (TXEN = 1) Transmit Disable Mode (TXEN = 0) Sleep Mode
OPERATING TEMPERATURE RANGE
NOTES 1 Between Burst Transients measured at the output of diplexer. Specifications subject to change without notice.
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AD8326 LOGIC INPUTS (TTL/CMOS Compatible Logic) (DATEN, CLK, SDATA, TXEN, SLEEP, V
Parameter Logic "1" Voltage Logic "0" Voltage Logic "1" Current (VINH = 5 V) CLK, SDATA, DATEN Logic "0" Current (VINL = 0 V) CLK, SDATA, DATEN Logic "1" Current (VINH = 5 V) TXEN Logic "0" Current (VINL = 0 V) TXEN Logic "1" Current (VINH = 5 V) SLEEP Logic "0" Current (VINL = 0 V) SLEEP
Specifications subject to change without notice.
CC = 12 V: Full Temperature Range)
Min 2.1 0 0 -600 50 -250 50 -250
Typ
Max 5.0 0.8 20 -100 190 -30 190 -30
Unit V V nA nA A A A A
TIMING REQUIREMENTS (Full Temperature Range, V
Parameter Clock Pulsewidth (tWH) Clock Period (tC) Setup Time SDATA vs. Clock (tDS) Setup Time DATEN vs. Clock (tES) Hold Time SDATA vs. Clock (tDH) Hold Time DATEN vs. Clock (tEH) Input Rise and Fall Times, SDATA, DATEN, Clock (tR, tF)
Specifications subject to change without notice.
t DS
SDATA
VALID DATA WORD G1 MSB. . . .LSB
CC
= 12 V, tR = tF = 4 ns, fCLK = 8 MHz unless otherwise noted.)
Min 16.0 32.0 5.0 15.0 5.0 3.0 10 Typ Max Unit ns ns ns ns ns ns ns
VALID DATA WORD G2
tC t WH
CLK
t ES
DATEN
t EH
8 CLOCK CYCLES
GAIN TRANSFER (G1)
GAIN TRANSFER (G2)
t OFF
TXEN
t GS t ON
ANALOG OUTPUT SIGNAL AMPLITUDE (p-p)
Figure 2. Serial Interface Timing
VALID DATA BIT
SDATA MSB
MSB-1
MSB-2
t DS
t DH
CLK
Figure 3. SDATA Timing
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AD8326
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage VCC Pins 5, 9, 10, 19, 20, 23, 27 . For ARP, Max VCC = VEE + 13 V; . . . . . . . . . . . . . . . . . . . . . . . For ARE, Max VCC = VEE + 11 V Input Voltages Pins 25, 26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V Pins 1, 2, 3, 6, 7 . . . . . . . . . . . . . . . . . . . . . -0.8 V to +5.5 V Internal Power Dissipation TSSOP EPAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 W PSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 W Operating Temperature Range . . . . . . . . . . . -40C to +85C Storage Temperature Range . . . . . . . . . . . . -65C to +150C Lead Temperature, Soldering 60 seconds . . . . . . . . . . . 300C
*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.
ORDERING GUIDE
Model AD8326ARP AD8326ARP-REEL AD8326ARP-EVAL AD8326ARE AD8326ARE-REEL AD8326ARE-EVAL
Temperature Range -40C to +85C
Package Description 28-Lead Power SOIC with Slug Evaluation Board 28-Lead TSSOP with Exposed Pad Evaluation Board
JA
Package Option RP-28
23C/W*
-40C to +85C
39C/W*
RE-28
*Thermal Resistance measured on SEMI standard 4-layer board.
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 AD8326 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.
WARNING!
ESD SENSITIVE DEVICE
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AD8326
PIN CONFIGURATION
DATEN SDATA CLK GND VCC TXEN SLEEP NC VCC
1 2 3 4 5 6 7 28 27 26 25 24
GND VCC VIN- VIN+ VEE VCC
TOP VIEW 22 VEE 8 (Not to Scale) 21 BYP
9 20 19 18 17 16 15
AD8326
23
VCC VCC VEE NC VEE OUT+
VCC 10 VEE 11 NC 12 VEE 13 OUT- 14
NC = NO CONNECT
PIN FUNCTION DESCRIPTIONS
Pin No. 1
Mnemonic DATEN
Description Data Enable Low Input. This port controls the 8-bit parallel data latch and shift register. A Logic 0-to-1 transition transfers the latched data to the attenuator core (updates the gain) and simultaneously inhibits serial data transfer into the register. A 1-to-0 transition inhibits the data latch (holds the previous gain state) and simultaneously enables the register for serial data load. Serial Data Input. This digital input allows for an 8-bit serial (gain) word to be loaded into the internal register with the MSB (Most Significant Bit) first and ignored. Clock Input. The clock port controls the serial attenuator data transfer rate to the 8-bit masterslave register. A Logic 0-to-1 transition latches the data bit and a 1-to-0 transfers the data bit to the slave. This requires the input serial data word to be valid at or before this clock transition. Common External Ground Reference Common Positive External Supply Voltage. A 0.1 F capacitor must decouple each pin. Transmit Enable pin. Logic 1 powers up the part. Low Power Sleep Mode. In the Sleep mode, the AD8326's supply current is reduced to 4 mA. A Logic 0 powers down the part (High ZOUT State) and a Logic 1 powers up the part. No Connection to these pins. Common Negative External Supply Voltage. A 0.1 F capacitor must decouple each pin. Negative Output Signal Positive Output Signal Internal Bypass. This pin must be externally ac-coupled (0.1 F capacitor). Noninverting Input. DC-biased to approximately VCC/2. Should be ac-coupled with a 0.1 F capacitor. Inverting Input. DC-biased to approximately VCC/2. Should be ac-coupled with a 0.1 F capacitor.
2 3
SDATA CLK
4, 28 5, 9, 10, 19, 20, 23, 27 6 7 8, 12, 17 11, 13, 16, 18, 22, 24 14 15 21 25 26
GND VCC TXEN SLEEP NC VEE OUT- OUT+ BYP VIN+ VIN-
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Typical Performance Characteristics- AD8326
VCC 10 F 0.1 F 75 +1/2 VIN 165 75 VIN- -1/2 VIN 0.1 F BYP 0.1 F VEE 0.1 F 10 F VEE 0.1 F VIN+ VCC OUT+
0.1 F + CL OUT- 0.1 F 1:1 TOKO 617DB-A0070 75 VO -
AD8326
TPC 1. Test Circuit
1.0 VS = 12V PO = 67dBmV@ MAX GAIN 0.5 10MHz
32.0 30.5 29.0 VS = 12V POUT = 67dBmV @ MAX GAIN
GAIN ERROR - dB
5MHz
CL = 0pF
GAIN - dB
0
27.5 26.0 CL = 20pF 24.5
CL = 10pF
-0.5
42MHz
-1.0
CL = 50pF 23.0
65MHz
-1.5 0 9 18 27 36 45 GAIN CONTROL - Decimal 54 63 72
21.5 1 10 FREQUENCY - MHz 100
TPC 2. Gain Error vs. Gain Control
TPC 4. AC Response for Various Capacitor Loads
40 30 20 10
VS = 12V VO = 67dBmV @ MAX GAIN 71D
OUTPUT NOISE - dBmV in 160 kHz
-26 f = 10MHz TXEN = 1 VS = 12V
-30
-34
GAIN - dB
46D 0 -10 -20 -30 -40 0.1 00D
-38
23D
-42
-46
-50 1 10 FREQUENCY - MHz 100 1000 0 8 16 24 32 40 48 56 64 72 GAIN CONTROL - Decimal
TPC 3. AC Response
TPC 5. Output Referred Noise vs. Gain Control
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AD8326
-50 -55 -60
DISTORTION - dBc
0 VS = 12V f = 42MHz PO = 67dBmV @ MAX GAIN HD3 -40 -50 -60 -10 -20 -30 RBW 500Hz RF ATT 30dB VBW 5kHz SWT 20s UNIT dBm CH PWR +12.27dBm ACP UP -56.72dB ACP LOW -56.71dB
-65 -70 -75 HD2 -80 -85 -90 0 9 18 27 36 45 GAIN CODE - Decimal 54
-70 -80 -90 -100 63 72 CENTER 21MHz 100kHz/ SPAN 1MHz
TPC 6. Harmonic Distortion vs. Gain Code for AD8326-ARP
TPC 9. Adjacent Channel Power for AD8326-ARP
-50 VS = 12V(ARP) -55 -60 VO = 69dBmV @ MAX GAIN
190 180 170
DISTORTION - dBc
-65 -70 -75 -80 -85 -90 5
IMPEDANCE -
VO = 68dBmV @ MAX GAIN
160 150 140 130 120 110 POWER-UP POWER-DOWN
SLEEP
VO = 67dBmV @ MAX GAIN VO = 65dBmV @ MAX GAIN
15
25 35 45 FREQUENCY - MHz
55
65
1
10
100 FREQUENCY - MHz
1000
TPC 7. Second Order Harmonic Distortion vs. Frequency for Various Output Powers
TPC 10. Input Impedance vs. Frequency (Inputs Shunted with 165 )
-35 VS = +12V(ARP) -40
1000
SLEEP
-45 DISTORTION - dBc -50 -55 -60 VO = 67dBmV @ MAX GAIN -65 VO = 65dBmV @ MAX GAIN -70 -75 5 15 25 35 45 FREQUENCY - MHz 55 65 VO = 68dBmV @ MAX GAIN VO = 69dBmV @ MAX GAIN
100
IMPEDANCE -
POWER-DOWN
POWER-UP 10
1 0.1
1
10 FREQUENCY - MHz
100
1000
TPC 8. Third Order Harmonic Distortion vs. Frequency for Various Output Powers
TPC 11. Output Impedance vs. Frequency
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AD8326
-50 -55 -60 VS = 5V f = 42MHz PO = 65dBmV @ MAX GAIN
0 -10 -20 -30 -40
HD3
RBW 500Hz RF ATT 30dB VBW 5kHz SWT 20s UNIT dBm
CH PWR +10.41dBm ACP UP -58.83dB ACP LOW -59.06dB
DISTORTION - dBc
-65 -70 -75 -80 HD2 -85 -90 0 9 18 27 36 45 DEC CODE 54 63 72
-50 -60 -70 -80 -90 -100 CENTER 21MHz 100kHz/ SPAN 1MHz
TPC 12. Harmonic Distortion vs. Gain Control for AD8326-ARE
-50 VS = -55 5V(ARE)
TPC 15. Adjacent Channel Power for AD8326-ARE
0 VS = 12V -20
-60
DISTORTION - dBc
-65 VO = 66dBmV @ MAX GAIN -70 -75 -80 -85 -90 5 15 VO = 62dBmV @ MAX GAIN
VO = 65dBmV @ MAX GAIN
ISOLATION - dBc
-40
TXEN = 1
-60
VO = 64dBmV @ MAX GAIN
-80 TXEN = 0 -100 SLEEP -120
25 35 45 FREQUENCY - MHz
55
65
0
10 100 FREQUENCY - MHz
1000
TPC 13. Second Order Harmonic Distortion vs. Frequency for Various Output Powers
-40 VS = -45
SUPPLY CURRENT - mA
TPC 16. Signal Isolation vs. Frequency
200
5V(ARE)
VS = 12V(ARP) 180 TRANSMIT ENABLE 160
VO = 66dBmV @ MAX GAIN
-50
DISTORTION - dBc
140 120 100 80 60 TRANSMIT DISABLE 40 20 -40 -30 -20 -10
-55 -60 -65 -70 -75 -80 5
VO = 65dBmV @ MAX GAIN
VO = 64dBmV @ MAX GAIN VO = 62dBmV @ MAX GAIN
15
25 35 45 FREQUENCY - MHz
55
65
0
10 20 30 40 50 TEMPERATURE - C
60
70
80
90
TPC 14. Third Order Harmonic Distortion vs. Frequency for Various Output Powers
TPC 17. Quiescent Current vs. Temperature
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AD8326
APPLICATIONS General Applications SPI Programming
The AD8326 is primarily intended for use as the upstream power amplifier (PA), also known as a line driver, in DOCSIS (Data Over Cable Service Interface Specification) certified cable modems, cable telephony systems, and CATV set-top boxes. The upstream signal is either a QPSK or QAM signal generated by a DSP, a dedicated QPSK/QAM modulator, or a DAC. In all cases the signal must be low-pass filtered before being applied to the PA in order to filter out-of-band noise and higher order harmonics from the amplified signal. Due to the varying distances between the cable modem and the headend, the upstream PA must be capable of varying the output power by applying gain or attenuation. The varying output power of the AD8326 ensures that the signal from the cable modem will have the proper level once it arrives at the headend. The upstream signal path also contains a transformer, a diplexer, and cable splitters. The AD8326 has been designed to overcome losses associated with these passive components in the upstream cable path, particularly in modems that support cable telephony.
AD8326ARP Applications
The AD8326 is controlled through a serial peripheral interface (SPI) of three digital data lines, CLK, DATEN, and SDATA. Changing the gain requires 8 bits of data to be streamed into the SDATA port. The sequence of loading the SDATA register begins on the falling edge of the DATEN pin, which activates the CLK line. With the CLK line activated, data on the SDATA line is clocked into the serial shift register, Most Significant Bit (MSB) first, on the rising edge of the CLK pulses. Since a 7-bit shift register is used in the AD8326, the MSB of the 8-bit word is a "don't care" bit and is shifted out of the register on the eighth clock pulse. The data is latched into the attenuator core on the rising edge of the DATEN line. This provides control over the changes in the output signal level. The serial interface timing for the AD8326 is shown in Figures 2 and 3. The programmable gain range of the AD8326 is -25.75 dB to +27.5 dB with steps of 0.75 dB. This provides a total gain range of 53.25 dB. The AD8326 was characterized with a TOKO transformer (TOKO #617DB-A0070), and the stated gain values include the losses due to the transformer. For gain codes from 0 through 71 the gain transfer function is:
The AD8326ARP is in a thermally enhanced PSOP2 package, and designed for single 12 V supply and output power applications up to +69 dBmV. The AD8326ARP will provide maximum performance in 12 V systems.
AD8326ARE Applications
[A
V
= 27.5 dB - (0.75 dB x (71 - CODE )
]
The AD8326ARE is in a TSSOP package with an exposed thermal pad. It is designed for dual 5 V or single 10 V supplies. For applications requiring up to 65 dBmV of output power, lower cost, smaller package, and lower power dissipation, the TSSOP package is most appropriate.
Operational Description
The AD8326 consists of four analog functions in the transmit enable or forward mode. The input amplifier (preamp) can be used single-ended or differentially. If the input is used in the differential configuration, it is imperative that the input signals be 180 degrees out of phase and of equal amplitudes. This will ensure proper gain accuracy and harmonic performance. The preamp stage drives a vernier stage that provides the fine tune gain adjustment. The approximate step resolution of 0.75 dB is implemented in this stage and provides a total of approximately 5.25 dB of accumulated attenuation. After the vernier stage, a DAC provides the bulk of the AD8326's attenuation (8 bits or 48 dB). The signals in the preamp and vernier gain blocks are differential to improve the PSRR and linearity. A differential current is fed from the DAC into the output stage, which amplifies these currents to the appropriate levels necessary to drive a 75 load. The output stage utilizes negative feedback to implement a differential 75 output impedance, which eliminates the need for external matching resistors needed in typical video (or video filter) termination requirements.
where AV is the gain in dB and CODE is the decimal equivalent of the 8-bit word. Gain codes 0 to 71 provide linear changes in gain. Figure 4 shows the gain characteristics of the AD8326 for all possible values in an 8-bit word. Note that maximum gain is achieved at Code 71. From Code 72 through 127 the 5.25 dB of attenuation from the vernier stage is being applied over every eight codes, resulting in the saw tooth characteristic at the top of the gain range. Because the eighth bit is shifted out of the register, the gain characteristics for Codes 128 through 255 are identical to Codes 0 through 127, as depicted in Figure 4.
28 21 14
GAIN - dB
7 0 -7 -14 -21 -28 0 32 64 96 128 160 192 224 256 GAIN CODE - Decimal
Figure 4. Gain Code vs. Gain
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AD8326
VEE 10 F
VCC 10 F 0.1 F 28 GND 27 VCC 26 VIN- 25 VIN+ 24 VEE 23 VCC 22 VEE 21 BYP 20 VCC 19 VCC 18 VEE 17 GND 16 VEE 15 VIN- 0.1 F ZIN = 150 165 0.1 F 0.1 0.1 0.1 0.1 F F F F VIN+ 0.1 F
AD8326
DATEN SDATA CLK 0.1 F TXEN SLEEP 0.1 F 0.1 F 0.1 F 0.1 F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DATEN SDATA CLK GND1 VCC TXEN SLEEP GND VCC VCC VEE GND VEE VOUT-
0.1 F 0.1 F 0.1 F
VOUT+
TOKO 617DB-A0070
TO DIPLEXER ZIN = 75
Figure 5. Typical Applications Circuit
Input Bias, Impedance, and Termination
The VIN+ and VIN- inputs have a dc bias level of approximately 1.47 V below VCC/2, therefore the input signal should be ac-coupled using 0.1 F capacitors as seen in the typical application circuit (see Figure 5). The differential input impedance of the AD8326 is approximately 1600 , while the single-ended input is 800 .
Single-Ended Inverting Input
Toko 1:1 transformer is included on the board for this purpose (T3). Enabling the evaluation board for single to differential input conversion requires R15-R17 to be removed, and 0 jumpers must be installed on the placeholders for R13, R14, and R18. For a 75 input impedance, R12 should be 78.7 . Refer to Figure 11 for evaluation board schematic. In this configuration, the input signal must be applied to VIN -. Other input impedances may be calculated using the equation in Figure 7.
DESIRED IMPEDANCE = R12||1600 VIN- R12
When operating the AD8326 in a single-ended input mode VIN+ and VIN - should be terminated as illustrated in Figure 6. On the AD8326 evaluation boards, this termination method requires the removal of R12, R13, R14, R16, R17, and R18. Install a 0 jumper at R15, an 82.5 resistor at R10 for a 75 system, and a 39.2 resistor at R11 to balance the inputs of the AD8326 evaluation board (Figure 11). Other input impedance configurations may be calculated using the equations in Figure 6.
ZIN = R10||800 R11 = ZIN||R10 VIN- R10 R11 -
AD8326
Figure 7. Differential Signal from Single-Ended Source
Differential Signal Source
AD8326
+
The AD8326 evaluation board is also capable of accepting a differential input signal. This requires the installation of a 165 resistor in R12, the removal of R13-R14, R17-R18, and the installation of 0 jumpers for R15-R16. This configuration results in a differential input impedance of 150 . Other differential input impedance configurations may be calculated with the equation in Figure 8.
DESIRED IMPEDANCE = R12||1600 VIN+ R12 VIN-
Figure 6. Single-Ended Input Impedance
The inverting and noninverting inputs of the AD8326 must be balanced for all input configurations.
Differential Input from Single-Ended Source
AD8326
The default configuration of the evaluation board implements a differential signal drive from a single-ended signal source. A
Figure 8. Differential Input
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AD8326
Output Bias, Impedance, and Termination
The outputs have a dc bias level of approximately VCC/2, therefore they should be ac-coupled before being applied to the load. The differential output impedance of the AD8326 is internally maintained at 75 , regardless of whether the amplifier is in transmit enable mode or transmit disable mode, eliminating the need for external back termination resistors. A 1:1 transformer is used to couple the amplifier's differential output to the coaxial cable while maintaining a proper impedance match. If the output signal is being evaluated on standard 50 test equipment, a minimum loss 75 -50 pad must be used to provide the test circuit with proper impedance match.
Single Supply Operation
at +65 dBmV with 5 V supplies. The AD8326ARP draws a maximum of 2 W at +67 dBmV with a +12 V supply. The following guidelines should be used for both the AD8326ARE and AD8326ARP. First and foremost, the exposed thermal pad should be soldered directly to a substantial ground plane that adequately absorbs heat away from the AD8326 package. This is the simplest, and most important step in thermally managing the power dissipated in the AD8326. Increasing the area of copper beneath the AD8326 will lower the thermal resistance in the PCB and more effectively allow air to remove the heat from the PCB, and consequently, from the AD8326. Secondly, thermal stitching is a method for increasing thermal capacity of the PCB. Additionally, thermal stitching can be used to provide a thermally efficient area onto which the AD8326 may be soldered. Thermal stitching is accomplished by using a number of plated through holes (or vias) densely populated in the solder pad area (but not confined to the size of the TSSOP or PSOP2 exposed thermal pad). This technique maximizes the copper area where the package is attached to the PCB increasing the thermal mass or capacity by utilizing more than one copper plane. This method of thermal management should be applied in close proximity to the exposed thermal pad. Another important guideline is to utilize a multilayer PCB with the AD8326. Lowering the PCB thermal resistance using several layers will generally increase thermal mass resulting in cooler junction temperatures. Using the techniques described above and dedicating 2.9 square inches of thermally enhanced PCB area, the AD8326 in either package can operate at safe junction temperatures. Figures 12-17 show the above practices in use on the AD8326ARE-EVAL board.
Initial Power-Up
The 12 V supply should be delivered to each of the VCC pins via a low impedance power bus to ensure that each pin is at the same potential. The power bus should be decoupled to ground using a 10 F tantalum capacitor located close to the AD8326ARP. In addition to the 10 F capacitor, each VCC pin should be individually decoupled to ground with 0.1 F ceramic chip capacitors located close to the pins. The pin labeled BYP (Pin 21) should also be decoupled with a 0.1 F capacitor. The PCB should have a low-impedance ground plane covering all unused portions of the board, except in the area of the input and output traces in close proximity to the AD8326 and output transformer. All ground and VEE pins of the AD8326ARP must be connected to the ground plane to ensure proper grounding of all internal nodes. Pin 28 and the exposed pad should be connected to ground.
Dual Supply Operation
The +5 V supply power should be delivered to each of the VCC pins via a low impedance power bus to ensure that each pin is at the same potential. The -5 V supply should also be delivered to each of the VEE pins with a low impedance bus. The power buses should be decoupled to ground with a 10 F tantalum capacitor located close to the AD8326ARE. In addition to the 10 F capacitor, all VCC, VEE and BYP pins should be individually decoupled to ground with 0.1 F ceramic chip capacitors located close to the pins. The PCB should have a low-impedance ground plane covering all unused portions of the board, except in the area of the input and output traces in close proximity to the AD8326 and output transformer. All ground pins of the AD8326ARE must be connected to the ground plane to ensure proper grounding of all internal nodes. Pin 28 and the exposed thermal pad should both be tied to ground.
Signal Integrity Layout Considerations
When the supply is first applied to the AD8326, the gain setting of the amplifier is indeterminate. Therefore, as power is first applied to the amplifier, the TXEN pin should be held low (Logic 0), preventing forward signal transmission. After power has been applied to the amplifier, the gain can be set to the desired level by following the procedure in the SPI Programming and Gain Adjustment section. The TXEN pin can then be brought from Logic 0 to Logic 1, enabling forward signal transmission at the desired gain level.
Asynchronous Power-Down
Careful attention to printed circuit board layout details will prevent problems due to board parasitics. Proper RF design technique is mandatory. The differential input and output traces should be kept as short as possible. It is also critical to make sure that all differential signal paths are symmetrical in length and width. In addition, the input and output traces should be kept far apart in order to minimize coupling (crosstalk) through the board. Following these guidelines will improve the overall performance of the AD8326 in all applications.
Thermal Layout Considerations
As integrated circuits become denser, smaller, and more powerful, they often produce more heat. Therefore when designing PC boards, the layout must be able to draw heat away from the higher power devices. The AD8326ARE draws up to 1.5 W when running
The asynchronous TXEN pin is used to place the AD8326 into "Between Burst" mode while maintaining a differential output impedance of 75 . Applying Logic 0 to the TXEN pin activates the on-chip reverse amplifier, providing a 72% reduction in consumed power. For 12 V operation, the supply current is typically reduced from 159 mA to 44 mA. In this mode of operation, between burst noise is minimized and the amplifier can no longer transmit in the upstream direction. In addition to the TXEN pin, the AD8326 also incorporates an asynchronous SLEEP pin, which may be used to further reduce the supply current to approximately 4 mA. Applying Logic 0 to the SLEEP pin places the amplifier into SLEEP mode. Transitioning into or out of SLEEP mode will result in a transient voltage at the output of the amplifier.
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Distortion, Adjacent Channel Power, and DOCSIS
In order to deliver +58 dBmV of high fidelity output power required by DOCSIS, the PA is required to deliver up to +67 dBmV. This added power is required to compensate for losses associated with the transformer, diplexer, directional coupler, and splitters that may be included in the upstream path of the cable telephony. It should be noted that the AD8326 was characterized with the TOKO 617DB-A0070 transformer. TPC 7, TPC 8, TPC 13, and TPC 14 show the AD8326 second and third harmonic distortion performance versus fundamental frequency for various output power levels. These figures are useful for determining the in band harmonic levels from 5 MHz to 65 MHz. Harmonics higher in frequency will be sharply attenuated by the low-pass filter function of the diplexer. Another measure of signal integrity is adjacent channel power, commonly referred to as ACP. DOCSIS section 4.2.10.1.1 states, "Spurious emissions from a transmitted carrier may occur in an adjacent channel that could be occupied by a carrier of the same or different symbol rates." TPC 9 shows the measured ACP for a +67 dBmV 16 QAM signal taken at the output of the AD8326 evaluation board, through a 75 to 50 matching pad (5.7 dB of loss). The transmit channel width and adjacent channel width in TPC 9 correspond to symbol rates of 160 KSYM/SEC. Table I shows the ACP results for the AD8326 for all conditions in DOCSIS Table 4-7 "Adjacent Channel Spurious Emissions."
Table I. Adjacent Channel Power
rate than the noise, resulting in a signal to noise ratio that improves with gain. In transmit disable mode, the output noise spectral density is 1.4 nV/Hz, which results in -65 dBmV when computed over 160KSYM/SECOND. The noise power was measured directly at the output of the transformer. In a typical cable telephony application there will be a 6 dB pad, or splitter, which will further attenuate the noise by 6 dB.
Evaluation Board Features and Operation
The AD8326 evaluation boards (Part # AD8326ARE-EVAL and AD8326ARP-EVAL) and control software can be used to control the AD8326 upstream cable driver via the parallel port of a PC. A standard printer cable connected between the parallel port and the evaluation board is used to feed all the necessary data to the AD8326 by means of the Windows 9X-based control software. This package provides a means of evaluating the amplifier by providing a convenient way to program the gain/attenuation as well as offering easy control of the asynchronous TXEN and SLEEP pins. With this evaluation kit, the AD8326 can be evaluated in either a single-ended or differential input configuration. The amplifier can also be evaluated with or without the PULSE diplexer in the output signal path. A schematic of the evaluation board is provided in Figure 11.
Output Transformer and Diplexer
Adjacent Channel Symbol Rate Transmit Symbol Rate 160K/s 320K/s 640K/s 1280K/s 2560K/s 160K/s ACP (dBc) -57 -57 -55 -55 -53 320K/s ACP (dBc) -59 -58 -58 -57 -56 640K/s ACP (dBc) -62 -60 -58 -58 -57 1280K/s 2560K/s ACP ACP (dBc) (dBc) -63 -62 -60 -58 -57 -64 -64 -62 -60 -57
Noise and DOCSIS
At minimum gain, the AD8326 output noise spectral density is 13.3 nV/Hz measured at 10 MHz. DOCSIS Table 4-8, "Spurious Emissions in 5 MHz to 42 MHz," specifies the output noise for various symbol rates. The calculated noise power in dBmV for 160 KSYM/SECOND is: 2 13.3 nV x 160 kHz + 60 = - 45.5 dBmV 20 x log Hz Comparing the computed noise power of -45.5 dBmV to the +8 dBmV signal yields -53.5 dBc, which meets the required level set forth in DOCSIS Table 4-8. As the AD8326 gain is increased from this minimum value, the output signal increases at a faster
A 1:1 transformer is needed to couple the differential outputs of the AD8326 to the cable while maintaining a proper impedance match. The specified transformer is available from TOKO (Part # 617DB-A0070); however, M/A-COM part # ETC-1-1T may also be used. The evaluation board is equipped with the TOKO transformer, but is also designed to accept the M/A-COM transformer. The PULSE diplexer included on the evaluation board provides a high-order low-pass filter function, typically used in the upstream path. To remove the diplexer from the signal path, remove the 0 chip resistors at R7 and R19, and install a 0 chip resistor at R6 so the output signal is directed away from the diplexer and toward the CABLE port of the evaluation board (Figure 11). The ability of the PULSE diplexer to achieve DOCSIS compliance is neither expressed nor implied by Analog Devices Inc. Data on the diplexer should be obtained from PULSE. When using the diplexer, be sure to properly terminate the cable port (75 ) so that the AD8326 draws minimal current.
Overshoot on PC Printer Ports
The data lines on some PC parallel printer ports have excessive overshoot that may cause communications problems when presented to the CLK pin of the AD8326. The evaluation board was designed to accommodate a series resistor and shunt capacitor (R2 and C2 in Figure 11) to filter the CLK signal if required.
Installing Visual Basic Control Software
Install the "CabDrive_26" software by running "setup.exe" on disk one of the AD8326 Evaluation Software. Follow on-screen directions and insert disk two when prompted. Choose installation directory, and then select the icon in the upper left to complete installation.
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Running AD8326 Software Memory Functions
To load the control software, go to START, PROGRAMS, CABDRIVE_26, or select the AD8326.exe from the installed directory. Once loaded, select the proper parallel port to communicate with the AD8326 (Figure 9).
The MEMORY section of the software provides a way to alternate between two gain settings. The "X->M1" button stores the current value of the gain slide bar into memory while the "RM1" button recalls the stored value, returning the gain slide bar to the stored level. The same applies to the "X->M2" and "RM2" buttons.
Figure 9. Parallel Port Selection
Controlling Gain/Attenuation of the AD8326
The slide bar controls the gain/attenuation of the AD8326, which is displayed in dB and in V/V. The gain scales 0.75 dB per LSB with valid codes from 0 to 71. The gain code from the position of the slide bar is displayed in decimal, binary, and hexadecimal (Figure 10).
Transmit Enable and Sleep Mode
Figure 10. Control Software Interface
The Transmit Enable and Transmit Disable buttons select the mode of operation of the AD8326 by asserting logic levels on the asynchronous TXEN pin. The Transmit Disable button applies Logic 0 to the TXEN pin, disabling forward transmission while maintaining a 75 back termination. The Transmit Enable button applies Logic 1 to the TXEN pin, enabling the AD8326 for forward transmission. Checking the "Enable SLEEP Mode" checkbox applies logic "0" to the asynchronous SLEEP pin, setting the AD8326 for SLEEP mode.
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TP15 TP18 TP17 TP16 TP13 C22 R15 R10 DNI R14 0 T3 4 3 TP14 C23 0.1 F R11 DNI 4 3 TOKO1 R13 0 TOKO1 R16 DNI ETC1 R12 78.7 C10 0.1 F C12 0.1 F C13 0.1 F VCC C15 0.1 F C16 0.1 F AGND TB1 VEE 1 LPP 9 HPP VEE TP7 0.1 F C14 DNI T4 DNI 6 2 1 6 2 1 ETC1 R17 DNI R18 0 Z1 0.1 F C20 0.1 F VIN - 0 + C7 10 F VCC C9 0.1 F C11 0.1 F
DATEN
SDATA
CLK
TXEN
SLEEP
C4
0.1 F
AD8326
C5
VIN + 0
0.1 F
C6
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.1 F
HPF_O
Figure 11. Evaluation Board Schematic
C19 + 10 F C18 0.1 F C17 0.1 F TP10 TP8 R4 OPEN AGND C20 4 0.1 F C21 0.1 F R5 OPEN TP9 3 T1 4 3 TOKO1 T2 DNI 6 2 1 6 2 1 ETC1 R6 OPEN R7 0 TP12 P1 19 P1 20 P1 21 P1 22 P1 23 P1 24 P1 25 P1 26 P1 27 P1 28 P1 29 P1 30 P1 31 P1 32 P1 33 P1 34 P1 35 P1 36
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W1
CX6002
CBL COM 3, 10-18 AGND
5
TP1
TP2
R1
0
W2
C1 DNI
TP3
TP4
R2
0
R19 0 R8 0
TP11
C2 DNI
TP5
TP6
R9 OPEN
CABLE_O
R3
0
P1 1 P1 2 P1 3 P1 4 P1 5 P1 6 P1 7 P1 8 P1 9 P1 10 P1 11 P1 12 P1 13 P1 14 P1 15 P1 16 P1 17 P1 18
C3 DNI
AD8326
AGND
AD8326
Figure 12. Evaluation Board Layout (Component Side)
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Figure 13. Evaluation Board Layout (Silkscreen Top)
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Figure 14. Evaluation Board Layout (Circuit Side)
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Figure 15. Evaluation Board Layout (Silkscreen Bottom)
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Figure 16. Evaluation Board Layout (Internal Ground Plane)
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Figure 17. Evaluation Board Layout (Internal Power Planes)
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AD8326
AD8326 Evaluation Board Rev. B - Revised - November 22, 2000
Qty. 2 4 14 9 1 2 6 1 1 3 4 1 1 1 1 1 1 4 4 2 2 2 2
Description 10 F 16 V. B Size Tantalum Chip Capacitor 0.1 F 50 V. 1206 Size Ceramic Chip Capacitor 0.1 F 25 V. 603 Size Ceramic Chip Capacitor 0 1/8 W. 1206 Size Chip Resistor 78.7 1% 1/8 W. 1206 Size Chip Resistor Yellow Test Point [INPUTS] (Bisco TP104-01-04) White Test Point [DATA] (Bisco TP104-0 -09) Red Test Point [VCC] (Bisco TP104-01-02) Blue Test Point [VEE] (Bisco TP104-01-06) Black Test Point [AGND] (Bisco TP104-01-00) End Launch SMA Connector Centronics Type 36 Pin Right-Angle Connector 3 Terminal Power Block (Green) 1:1 Transformer TOKO # 617DB - A0070 Pulse # CX 6002 Diplexer AD 8326ARE (TSSOP ePad) UPSTREAM Cable Driver AD 8326ARE REV. B Evaluation PC Board #4-40 x 1/4 Inch STAINLESS Panhead Machine Screw #4-40 x 3/4 Inch Long Aluminum Round Standoff # 2-56 x 3/8 inch STAINLESS Panhead Machine Screw # 2 Steel Flat Washer # 2 Steel Internal Tooth Lockwasher # 2 STAINLESS STEEL Hex. Machine Nut
Vendor ADS# 4-7-24 ADS# 4-5-18 ADS# 4-12-8 ADS# 3-18- 88 ADS# 3-18-194 ADS# 12-18-32 ADS# 12-18-42 ADS# 12-18-43 ADS# 12-18-62 ADS# 12-18-44 ADS# 12-1-31 ADS# 12-3-50 ADS# 12-19-14 TOKO PULSE ADI# AD8326XRE ADI# AD8326XRE-EVAL ADS# 30-1-1 ADS# 30-16-3 ADS# 30-1-17 ADS# 30-6-6 ADS# 30-5-2 ADS# 30-7-6
Ref Description C7, C19 C20-23 C4-C6, C8-C18 R1-R3, R7, R8, R13, R14, R18, R19 R12 TP13, TP14 TP1-TP6 TP15 TP7 TP16-TP18 VIN-, VIN+, CABLE, HPF P1 TB1 T3, T1 Z2 Z1 EVAL PCB
(p1 hardware) (p1 Hardware) (p1 Hardware) (p1 Hardware)
Do not install C1-C3, R4-R6, R10, R11, R15-R17, T2, T4, TP8-TP12, W1-W2.
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OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
28-Lead PSOP (RP-28)
0.711 (18.06) 0.701 (17.81)
28
15
0.189 (4.80) 0.179 (4.55)
1
HEAT SLUG ON BOTTOM
14
0.299 (7.59) 0.292 (7.42) 0.410 (10.41) 0.400 (10.16)
PIN 1
0.539 (13.69) 0.529 (13.44)
0.098 (2.49) 0.090 (2.29) 8 0
0.016 (0.41) 0.010 (0.25)
45
0.004 (0.10) 0.000 (0.00) STANDOFF
0.050 (1.27) BSC
0.019 (0.48) 0.014 (0.36)
SEATING 0.0125 (0.32) PLANE 0.0091 (0.23)
0.040 (1.27) 0.024 (0.61)
28-Lead HTSSOP (RE-28)
0.386 (9.80) 0.382 (9.70) 0.378 (9.60)
15
28
0.119 (3.05) 0.117 (3.00) 0.115 (2.95)
1
EXPOSED PAD ON BOTTOM
0.177 (4.50) 0.252 0.173 (4.40) (6.40) 0.169 (4.30) BSC
14
PIN 1 0.138 (3.55) 0.136 (3.50) 0.134 (3.45) 0.041 (1.05) 0.039 (1.00) 0.031 (0.80)
0.047 (1.20) MAX 0.006 (0.15) 0.000 (0.00)
0.0256 (0.65) BSC
0.0118 (0.30) SEATING 0.0075 (0.19) PLANE
0.0079 (0.20) 0.0035 (0.09)
8 0
0.030 (0.75) 0.024 (0.60) 0.177 (0.45)
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (mm)
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C01856-1.5-7/01(0)
PRINTED IN U.S.A.

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