TheAD8322isalowcostdigitallycontrolledvariablegainamplifieroptimizedforcoaxiallinedrivingapplicationssuchascablemodemsthataredesignedtotheMCNS-DOCSISupstreamstandard.A8-bitserialworddeterminesthedesiredoutputgainovera42dBrangeresultingingainchangesof6dB/LSB.
TheAD8322comprisesadigitallycontrolledvariableattenuatorof0dBto-42dB,whichisprecededbyalownoise,fixedgainbufferandisfollowedbyalowdistortionhighpoweramplifier.WhenusedinaDOCSISmodemapplicationtheAD8322workswiththeattenuatoravailableonsomedemodulatorstosupportthe50dBrangerequiredbyDOCSIS.TheAD8322acceptsadifferentialorsingle-endedinputsignal.Theoutputisspecifiedfordrivinga75Ohmload,suchascoaxialcable,althoughtheAD8322iscapableofdrivingotherloads.
AnevaluationboardisavailableforthisproductandmaybeorderedusingthefollowingproductnumberAD8322-EVAL.
