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.

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

APPLICATIONS

Gain Programmable Line Driver

HFC High Speed Data Modems

Interactive CATV Set-Top Boxes

CATV Plant Test Equipment

General Purpose IF Variable Gain Block

AD8321-EVAL屬于開發(fā)板，套件，編程器 > 評(píng)估和演示板及套件。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD8321-EVAL評(píng)估和演示板及套件該系列產(chǎn)品提供了一種方便的方法，在經(jīng)過驗(yàn)證的實(shí)施環(huán)境中評(píng)估某些重點(diǎn)器件的性能或特性。評(píng)估方法通常有完善的文檔說明，并且視乎具體情況由評(píng)估軟件提供支持。產(chǎn)品通常由印刷電路板組成，板上已裝有重點(diǎn)器件以及必要或有用的支持元器件，另外也可能包括其他組件，例如電纜或電源。對(duì)于數(shù)量特別多或類別獨(dú)特的器件類別(如 ADC、DAC 和開關(guān)模式電源)，評(píng)估平臺(tái)可組合為一個(gè)單獨(dú)的產(chǎn)品系列。