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5.4.1Digital-to-Analog(D/A)Performance
MeasurementsforDynamicCharacteristics
Measurementpath:01.LineOutputandHeadphoneOutput
csvfile:01_DAC_Line_Output_and_Headphone_Output.csv
Table5-1.D/ALineOutputParameters
PowerSupplyParameterFilterSettingR
L
(kΩ)LOLLOR
3.3VTHD+N(0dBFSat1kHz)400Hz—20kHzAES-17100.007%0.008%
SNR(BPZinput)22Hz—20kHzSPCL+1093.1dB93.0dB
A-weighting
DR(–60dBFSinput)22Hz—20kHzSPCL+1093.1dB92.9dB
A-weighting
ChannelSeparation22Hz—20kHzAES-171090.5dB90.4dB
(BPZinputfortarget
channel)
Table5-2.16ΩHeadphoneOutputInsertedinHeadphoneJackJ6
PowerSupplyParameterFilterSettingR
L
(Ω)HPOLHPOR
3.3VTHD+N(40mW,HP400Hz—20kHzAES-17160.028%0.027%
volume=–1dB)
SNR(BPZinput)22Hz—20kHzSPCL+1693.1dB93.0dB
A-weighting
DR(–60dBFSinput)22Hz—20kHzSPCL+1693.4dB93.1dB
A-weighting
ToobtaintheperformanceresultsshowninTable5-1andTable5-2,thespeakermoduleshouldbe
powereddown,andotherfunctionsshouldbesetwiththeseparameters:
•SpeakerAmp:Disabled
•ADCL-channelandADCR-channel:Disabled
•ALC:Off
•Volume:0dB
•Analogmixing:Disabled
•R
L
=10kΩforthelineoutput
•R
L
=16ΩinsertedintheJ6headphonejackfortheheadphoneoutput
Thebundled.csvfileautomaticallysetsthedevicetotheseconditions.
Note:Theheadphonevolumeshouldbechangedfrom0dBto–1dBandthesignalinputlevelof
theAudioPrecisionanalyzershouldbechangedto40mWoutputpowerwhenTHD+Nis
measuredat16Ω.
SeeAppendixA:LineOutputandHeadphoneOutputforasignalflowblockdiagram.
EvaluationandMeasurements 56SBAU127–July2007
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