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相似物
Loopback
PGA
低 通过
过滤
sigma-
Delta
DAC
反对-
Aliasing
过滤
sigma-
Delta
模数转换器
Sinc
过滤
fir 过滤
iir 过滤
decimation 过滤
Sinc
过滤
fir 过滤
iir 过滤
interpolation 过滤
数字的 loopback
w/ sidetone 控制
和 沉默的
m/s
DOUT
DIN
FS
SCLK
FSD
PGA
SMARTDM
-9 db 至 -27 db
串行
端口
0 db 至 42 db (1.5 db 步伐)
48 db, 54 db
V
ref
CODEC
0 db 至 -42 db (1.5 db 步伐)
-48 db, -54 db
tlv320aic20,tlv320aic21
tlv320aic24,tlv320aic25
tlv320aic20k,tlv320aic24k
SLAS363D–MARCH2002–REVISEDAPRIL2005
functionalblockdiagram(oneoftwochannelsshown)
DefinitionsandTerminology
datatransferthetimeduringwhichdataistransferredfromdoutandtodin.
intervaltheintervalis16shiftclocks,andthedatatransferisinitiatedby
thefallingedgeofthefssignal.
SignalDataThisreferstotheinputsignalandalloftheconvertedrepresentations
throughtheADCchannelandthesignalthroughtheDACchanneltothe
analogoutput.thisiscontrastedwiththepurelydigitalsoftwarecontrol
数据.
FrameSyncFramesyncrefersonlytothefallingedgeofthesignalFSthatinitiates
thedatatransferinterval
FrameSyncandSamplingPeriodFramesyncandsamplingperiodisthetimebetweenfallingedgesof
successivefssignals.
f
s
Thesamplingfrequency
ADCChannelADCchannelreferstoallsignalprocessingcircuitsbetweentheanalog
inputandthedigitalconversionresultatdout.
DACchannelDACchannelreferstoallsignalprocessingcircuitsbetweenthedigital
datawordappliedtoDINandthedifferentialoutputanalogsignal
availableatoutpandoutm.
dxxbitpositionintheprimarydataword(xxisthebitnumber)
dsxxbitpositioninthesecondarydataword(xxisthebitnumber)
dThealphacharacterdrepresentsvalidprogrammedordefaultdatainthe
controlregisterformat(seesection3.2,secondaryserialcommuni-
cation)whendiscussingotherdatabitportionsoftheregister.
PGAProgrammablegainamplifier
IIRInfiniteimpulseresponse
FIRFiniteimpulseresponse
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