AD8322

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.

------百度翻译-----

ad8322是一种低成本的数字控制可变增益放大器的同轴电缆调制解调器驱动等应用而设计的微小病变肾病- DOCSIS上行线标准优化。一个8位串行字在42分贝范围内决定所需的输出增益，使增益变化为6分贝/ LSB。

的ad8322包括数字控制可变衰减器的0分贝至42分贝，这是之前有一个低噪声，固定增益缓冲器，是由高功率低失真放大器。当使用一个DOCSIS调制解调器应用ad8322作品对解调器可用衰减器来支持所需的DOCSIS 50 dB范围。的ad8322接受差分或单端输入信号。输出驱动75欧姆的负载指定，例如同轴电缆，虽然ad8322能够驱动其他负载。

评估板可用此产品可使用以下产品数量ad8322-eval有序。