Texas Instruments DEM-DAI3793A Stereo Receiver User Manual


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5.4.3.1LCLow-PassFilter
Note(1):SameconfigurationatSPORN/SPORP
SPOL
SPOR
J3
J4
SnubberCircuit LCLPF
SPOLN
SPOLP
L122 Hm
L222 Hm
C11
2.2 Fm
C12
2.2 Fm
C9
0.82 Fm
C8
0.82 Fm
R6
330W
R5
330W
R
8
L
W
Audio
Analyzer
Differential
Input
J3
TP2
TP1
+
-
f =
C
» 37.5[kHz]
2 p´ ´
LC
1
(1)
MeasurementsforDynamicCharacteristics
DaughterCard#2providesanLClow-passfilter(LPF)toobtainacleananalogsignalfromthe
pulse-widthmodulated(PWM)outputofthespeakeroutput.ThisconfigurationisshowninFigure5-7.
Additionally,asnubbercircuitisinsertedintothesignallinetoachievethebestoutputpowerperformance
bysuppressingringinginthePWMpulse;however,asnubbercircuitwillhavenegligibleeffectsintheend
system.
Figure5-7.SpeakerOutputFilterConfiguration
EvaluationandMeasurements 58SBAU127–July2007
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