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PGND
rout-
PV
DD
RHPIN
RLINEIN
RIN
V
DD
LIN
LLINEIN
LHPIN
PV
DD
lout-
1
ROUT+
se/btl
hp/线条
容积
SEDIFF
SEMAX
AGND
绕过
FADE
关闭
LOUT+
PGND
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
C
S
NC
V
DD
C
i
C
i
C
S
C
i
C
i
C
S
电源 供应
left 负的
差别的 输入 信号
电源 供应
V
DD
100 k
Ω
100 k
Ω
C
C
在 从 dac
或者
分压器
(直流 voltage)
C
(byp)
系统
控制
C
C
正确的
扬声器
Left
扬声器
Headphones
1 k
Ω
1 k
Ω
NC
left 积极的 差别的
输入 信号
正确的 负的
差别的 输入 信号
正确的 积极的
差别的 输入 信号
se/btloperation
TPA6011A4
SLOS392A–FEBRUARY2002–REVISEDJULY2004
applicationinformation(持续)
一个.a0.1-µfceramiccapacitorshouldbeplacedascloseaspossibletotheic.forfilteringlower-frequencynoise
信号,alargerelectrolyticcapacitorof10µforgreatershouldbeplacedneartheaudiopoweramplifier.
figure29.typicaltpa6011a4applicationcircuitusingdifferentialinputs
TheabilityoftheTPA6011A4toeasilyswitchbetweenBTLandSEmodesisoneofitsmostimportantcost
savingfeatures.thisfeatureeliminatestherequirementforanadditionalheadphoneamplifierinapplications
whereinternalstereospeakersaredriveninBTLmodebutexternalheadphoneorspeakersmustbe
accommodated.internaltothetpa6011a4,twoseparateamplifiersdriveout+andout-.这些/btlinput
controlstheoperationofthefolloweramplifierthatdriveslout-androut-.whense/btlisheldlow,这
amplifierisonandthetpa6011a4isinthebtlmode.whense/btlisheldhigh,theout-amplifiersareina
highoutputimpedancestate,whichconfiguresthetpa6011a4asansedriverfromlout+androut+.i
DD
是
reducedbyapproximatelyone-thirdinsemode.controlofthese/btlinputcanbefromalogic-levelcmos
sourceor,moretypically,fromaresistordividernetworkasshowninfigure30.thetriplevelforthese/btl
inputcanbefoundinthe
recommendedoperatingconditions
表格.
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