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AD8325:  5 V CATV Line Driver Fine Step Output Power Control

The AD8325 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.

The AD8325 is packaged in a low-cost 28-lead TSSOP, operates from a ...More

AD8325:  5 V CATV Line Driver Fine Step Output Power Control

Product Description

The AD8325 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.

The AD8325 is packaged in a low-cost 28-lead TSSOP, operates from a single 5 V supply, and has an operational temperature range of -40°C to +85°C.

An evaluation board is available for this product and may be ordered using the following product number AD8325-EVAL.

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  • Supports DOCSIS Standard for Reverse Path Transmission
  • Gain Programmable in 0.75 dB Steps Over a 59.45 dB Range
  • Low Distortion at 61 dBmV Output
    –57 dBc SFDR at 21 MHz
    –55 dBc SFDR at 42 MHz
  • Output Noise Level: –48 dBmV in 160 kHz
  • Maintains 75Ω Output Impedance
    Transmit Enable and Transmit Disable Modes
  • Upper Bandwidth:100 MHz (Full Gain Range)
  • 5 V Supply Operation
  • Supports SPI Interfaces
  • Supply Voltage (V): +5V
  • Gain Low End (dB): -29.5dB
  • Gain High End (dB): +30dB
  • -3 dB BW (MHz): 100MHz
  • Spectral Noise (nV/rtHz): 56nV/rtHz
  • Gain Accuracy (dB): ±1dB
  • Supply Current : 133mA
  • Package: 28-Lead TSSOP

Functional Block Diagram for AD8325

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Part# Gain Control -3 dB BW (MHz) Gain Low End (dB) Gain High End (dB) Number of Channels Spectral Noise (nV/rtHz) Supply Voltage (V) Supply Current Gain Accuracy (dB) 1 dB Comp Point (dBm) Package Price* (1000-4999)
AD600 Analog 35 0 +40 2 1.4 ±5 14mA - - - $16.61
AD602 Analog 35 -10 +30 2 1.4 ±5 14mA - - - $13.36
AD603 Analog 90 -11 +31 1 1.4 ±5 20mA ±0.5 - 8-Lead DIP, 8-Lead SOIC $5.47
AD604 Analog 40 0 +48 2 0.8 ±5 31mA ±0.3 15 24-Lead SOIC, 24-Lead SSOP $16.45
AD605 Analog 40 -14 +34 2 1.8 +5 23mA ±0.2 15 16-Lead SOIC $9.91
AD8260 Digital 180 -6 +24 1 2.4 +3.3 28mA +0.25 - - $3.84
AD8264 Analog 235 0 +24 4 2.3 ±5 99mA +2 - 40-Lead LFCSP $11.95
AD8320 Digital 150 -10 +26 1 53 +12 105mA ±0.2 22.5 20-Lead SOIC -
AD8321 Digital 120 -27.4 +26 1 20 +9 90mA ±1 19.5 20-Lead SOIC $4.40
AD8322 Digital 180 -12.6 +29.5 1 64 +5 113mA ±2 19 28-Lead TSSOP $3.19
AD8323 Digital 100 -26 +27.5 1 - +5 - - - 28-Lead TSSOP $3.34
AD8324 Digital 100 -25.5 +33.5 1 157 +3.3 207mA ±1 21 20-Lead LFCSP, 20-Lead QSOP $1.73
AD8325 Digital 100 -29.5 +30 1 56 +5 133mA ±1 18.5 28-Lead TSSOP $3.34
AD8326 Digital 100 -26 +27.5 1 100 ±5 157mA ±1 26.5 28-Lead PSOP, 28-Lead TSSOP $3.95
AD8327 Digital 160 -18 +30 1 64 +5 105mA ±1 18 20-Lead TSSOP $3.80
AD8328 Digital 107 -27.5 +31.5 1 135 - 120mA ±1 18.4 20-Lead LFCSP, 20-Lead QSOP $1.92
AD8330 Analog 150 0 +50 1 5 +6 20mA ±0.5 - 16-Lead LFCSP, 16-Lead QSOP $4.44
AD8331 Analog 120 -4.5 +43 1 0.74 +5 25mA +0.5 7 - $5.45
AD8332 Analog 120 -4.5 +43.5 2 0.74 +5 58mA +0.5 7 28-Lead TSSOP, 32-Lead CSP $10.57
AD8334 Analog 100 +4.5 +43.5 4 0.74 +5 116mA +0.5 7 64-Lead LFCSP $14.66
AD8335 Analog 70 -10 +38 4 1.3 +5 76mA ±0.2 18 64-Lead LFCSP $12.14
AD8336 Analog 115 -14 +46 1 3 ±12 25mA ±0.5 11 16-Lead LFCSP $4.59
AD8337 Analog 280 0 +24 1 2.2 ±5 15mA ±0.25 - 8-Lead LFCSP $2.49
AD8350 Analog 900 +15 +20 - 1.7 +11 28mA - 2 8-Lead SOIC/8-Lead uSOIC $2.52
AD8351 Analog 2200 0 +26 - 2.7 +5 28mA - 13 10-Lead uSOIC $2.68
AD8352 Analog 2200 +3 +25 - 2.6 +5.5 37mA - 13 16-Lead LFCSP $3.53
AD8366 Digital 1000 +4.5 +20.5 - - - 180mA - - 32-Lead CSP -
AD8367 Analog 500 -2.5 +42.5 1 1.84 +5.5 26mA ±0.2 8.1 14-Lead TSSOP $4.60
AD8368 Analog 800 -12 +22 1 - +5 - ±0.4 13 24-Lead LFCSP $4.60
AD8369 Digital 600 -5 +40 1 2 +5.5 37mA ±0.5 0.5 16-Lead TSSOP $4.25
AD8370 Digital 750 -11 +34 1 2.1 +5.5 78mA - 14 16-Lead TSSOP $4.25
AD8372 Digital 130 -9 +32 2 - +5 116mA ±0.3 - 32-Lead CSP $6.58
AD8375 Digital 630 -4 +20 1 - +5 125mA ±0.2 19 24-Lead LFCSP $4.54
AD8376 Digital 700 -4 +20 2 - +5 250mA ±0.2 19 32-Lead CSP $6.57
ADL5330 Analog 3000 -34 +22 1 - +5 215mA - 1.2 24-Lead LFCSP $5.04
ADL5331 Analog 1500 -14 +17 1 - - 240mA - - - -
ADL5390 Analog 2400 - +7 1 - +5 130mA - 9.6 24-Lead LFCSP $7.59
ADL5391 Analog 2000 - +9.5 1 26.7 +5 135mA - 15.1 16-Lead LFCSP $4.95
ADL5561 - 2900 +6 +15.5 - 2.1 - 40mA - - 16-Lead LFCSP $3.68
ADL5592 Digital 2400 - +30.5 1 - - 189mA -0.02 - 40-Lead LFCSP -
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* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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Model
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Status
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Package Description
The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.