OBSOLETE PRODUCT — AD8322:  5 V CATV Line Driver with Coarse Step Output Power Control

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

Product Description

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.

REPLACEMENT PARTS

Rochester Electronics is the only authorized source of Analog Devices' products that have previously been discontinued or have become obsolete. Product availability should be checked directly with Rochester Electronics.



Характеристики

Bandwidth -3dB (typ) 180MHz
Gain/Attenuate Range (dB) +42dB
Gain (min) --12.6dB
Gain (max) 42dB; +29.5dB
Gain Control Step (dB) 6dB
HD 2 (typ) +-52dBc
HD 3 (typ) +-53dBc
Vsupply Positive (max) +5V
Package 28-Lead TSSOP
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