AD8322

Obsolete

5 V CATV Line Driver with Coarse Step Output Power Control

Data Sheet (Rev. 0) Product Selection Table
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Overview

The AD8322 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. A 8-bit serial word determines the desired output gain over a 42 dB range resulting in gain changes of 6 dB/LSB.

The AD8322 comprises a digitally controlled variable attenuator of 0 dB to -42 dB, which is preceded by a low noise, fixed gain buffer and is followed by a low distortion high power amplifier. When used in a DOCSIS modem application the AD8322 works with the attenuator available on some demodulators to support the 50 dB range required by DOCSIS. The AD8322 accepts a differential or single-ended input signal. The output is specified for driving a 75 Ohm load, such as coaxial cable, although the AD8322 is capable of driving other loads.

An evaluation board is available for this product and may be ordered using the following product number AD8322-EVAL.

AD8322
5 V CATV Line Driver with Coarse Step Output Power Control
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Documentation

Application Note 1

Frequently Asked Question 1

Obsolete Data Sheet 1

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Evaluation Kits

EVAL-AD8322

AD8322 Evaluation Board

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Product Details

The AD8322 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. A 8-bit serial word determines the desired output gain over a 42 dB range resulting in gain changes of 6 dB/LSB. Full data on the AD8322 and the evaluation board features is available in the AD8322 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board. On-board components include an input transformer to convert single ended input signals into a differential signal, a diplexer to allow insertion into a cable modem system, and various options for input and output terminations.
EVAL-AD8322
AD8322 Evaluation Board

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