AD8321:  Gain Programmable CATV Line Driver

The AD8321 is a low cost digitally controlled variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the DOCSIS* (upstream) standard. An ...More

AD8321:  Gain Programmable CATV Line Driver

Product Description

The AD8321 is a low cost digitally controlled variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the DOCSIS* (upstream) standard. An 8-bit serial word determines the desired output gain over a 53.4 dB range, resulting in gain changes of 0.75 dB/LSB.

The AD8321 is packaged in a low cost 20-lead SOIC, operates from a single +9 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: AD8321-EVAL. Schematic and layout for this evaluation board is contained in the product datasheet.

Features

  • Linear in dB Gain Response Over >53 dB Range
  • Drives Low Distortion >11 dBm Signal into 75 Ω Load: –53 dBc SFDR at 42 MHz
  • Very Low Output Noise Level
  • Maintains Constant 75 Ω Output Impedance
    Power-Up and Power-Down Condition
    No Line Transformer Required
  • Upper Bandwidth:
    235 MHz (Min Gain)
  • 9 V Single Supply Operation
  • Power-Down Functionality
  • Supports SPI Interface
  • Low Cost

Diagrams

AD8321 Diagram
Functional Block Diagram for AD8321

技术指标

Supply Voltage (V) +9V
Gain Low End (dB) -27.4dB
Gain High End (dB) +26dB
-3 dB BW (MHz) 120MHz
Spectral Noise (nV/rtHz) 20nV/rtHz
Gain Accuracy (dB) ±1dB
Supply Current (max) 90mA
Package 20-Lead SOIC

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订阅新产品资料
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 (max) 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 $4.40
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
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