1.1Introduction—PCM3793A/94A
1.1.1KeyFeatures
Introduction—PCM3793A/94A
ThePCM3793A/94Aisalow-powerstereocodecdesignedforportabledigitalaudioapplications.The
deviceintegratesastereodigitalspeakeramplifier,headphoneamplifier,lineamplifier,lineinput,boost
amplifier,microphonebias,programmablegaincontrol,analogmixing,soundeffects,andautomaticlevel
control(ALC)features.(ThePCM3794Ahasnospeakeramplifiers.)
Itisavailableina5×5QFNpackagetoreducetheoveralldevicefootprint.ThePCM3793A/94Aaccepts
Right-Justified,Left-Justified,I
2
S™,anddigitalsignalprocessing(DSP)formats,providinganeasy
interfacetoaudioDSPs,aswellasdecodersandencoderchips.Samplingratesupto50kHzare
supported.Theuser-programmablefunctionsareaccessiblethroughatwo-orthree-wireserialcontrol
port.
MajorfeaturesofthePCM3793A/94Ainclude:
•AnalogFrontEnd:
–Stereosingle-endedinputwithmultiplexer(mux)
–Monodifferentialinput
–Stereoprogrammablegainamplifier(PGA)
–Microphoneamplifier(20dB)andbias
•AnalogBackEnd:
–Stereo/Monolineoutputwithvolume
–Stereo/Monoheadphoneamplifierwithvolumeandcaplessmode
–Stereo/Monodigitalspeakeramplifier(BTL)withvolume
•AnalogPerformance:
–Dynamicrange:93dB(digital-to-audioconverter[DAC])
–Dynamicrange:90dB(analog-to-digitalconverter[ADC])
–40mW+40mWheadphoneoutputatR
L
=16Ω
–700mW+700mWspeakeroutputatR
L
=8Ω
•PowerSupplyVoltage
–1.71Vto3.6VfordigitalI/Osection
–1.71Vto3.6Vfordigitalcoresection
–2.4Vto3.6Vforanalogsection
–2.4Vto3.6Vforpoweramplifiersection
•LowPowerDissipation:
–7mWinplayback,1.8V/2.4V,48kHz
–13mWinrecord,1.8V/2.4V,48kHz
–3.3μWinpower-down
•SamplingFrequency:5kHzto50kHz
•AutomaticLevelControlforRecording
•OperationFromaSingleClockInputwithoutPLL
•SystemClock:
–Common-audioclock(256f
S
/384f
S
),12MHz/24MHz,13MHz/26MHz,13.5MHz/27MHz,
19.2MHz/38.4MHz,19.68MHz/39.36MHz
•HeadphonePlugInsertDetection
•I
2
C™orSPI™SerialControl
12DescriptionSBAU127–July2007
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