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DigitalInputsandOutputs
ADCPATHFILTER
ADCDYNAMICPERFORMANCE
tlv320aic20,tlv320aic21
tlv320aic24,tlv320aic25
tlv320aic20k,tlv320aic24k
SLAS363D–MARCH2002–REVISEDAPRIL2005
fs=8khz,outputsnotloaded
PARAMETERMINTYPMAXUNIT
V
OH
高-leveloutputvoltage,dout0.8iovddv
V
OL
低-leveloutputvoltage,dout0.1iovddv
I
IH
高-levelinputcurrent,anydigitalinput5µa
I
IL
低-levelinputcurrent,anydigitalinput5µa
C
i
Inputcapacitance3pF
C
o
Outputcapacitance5pF
FS=8KHz
(1)(2)
测试
PARAMETERMINTYPMAXMINTYPMAXUNIT
情况
PATHFILTERFIRFILTERIIRFILTER
0hzto60hz-27/0.07-27/0.15
60hzto200hz-1/0.07-0.75/0.15
200hzto300hz-0.03/0.050.11/0.15
300hzto2.4khz-0.10.15-0.10.25
Filtergainrelativetogain
2.4khzto3khz-0.050.15-0.50.2db
at1020Hz
3khzto3.4khz-0.50.1-0.50.2
3.4khzto3.6khz-0.40.15
4khz-26-42
4.5khzto72khz-52-52
(1)thefiltergainoutsideofthepassbandismeasuredwithrespecttothegainat1020hz.theanaloginputtestsignalisasinewavewith
0dB=4V
i(pp)
asthereferencelevelfortheanaloginputsignal.thepassbandis0to3600hzforan8-khzsamplerate.thispass
bandscaleslinearlywiththesamplerate.
(2)thefiltercharacteristicsarespecifiedbydesignandarenottestedinproduction.inplaceswheremorethanonevalueisspecified,这
firstvalueiswiththeHighPassFilteronandthesecondvalueiswiththeHPFoff
withfirfilter,fs=8khz
(1)
测试
PARAMETERMINTYPMAXMINTYPMAXUNIT
情况
lineindriveraic20/21/24/25aic20k/24k
V
I
=-3db81847084
snrsignal-至-noiseratio
V
I
=-9db737676
V
I
=-3db83907090
THDTotalharmonicdistortiondB
V
I
=-9db818888
V
I
=-3db808383
信号-至-调和的
THD+N
distortion+noise
V
I
=-9db737676
(1)thetestconditionisadifferential1020-hzinputsignalwithan8-khzconversionrate.inputandoutputcommonmodeis1.35v.
6
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