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參數資料
型號: TPS65950ZXNR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝: 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數: 154/167頁
文件大小: 2566K
代理商: TPS65950ZXNR
Device
Onboard
MICBIAS.GND
MIC.SUB.P/MIC.MAIN.P
MICBIAS1/2.OUT
R
/R
MM.BP
MS.SP
C
/C
MM.B
MS.B
MIC.SUB.M/MIC.MAIN.M
47pF
Closeto
device
Closeto
device
032-034
(R
orR
)/2–
(R
orR
)
MM.GM
MS.GM
MM.BP
MS.BP
C
/C
MM.P
MS.P
C
/C
MM.PM
MS.PM
C
/C
MM.M
MS.M
R
/2orR
/2
MM.GM
MS.GM
C
orC
MM.GM
MS.GM
C
orC
MM.GP
MS.GP
TPS65950
Integrated Power Management/Audio Codec
www.ti.com
SWCS032 – OCTOBER 2008
Figure 6-21. Analog Microphone Differential
NOTE
For other component values, see Table 15-1.
NOTE
To improve the rejection, it is highly recommended to ensure that MICBIAS_GND is as
clean as possible. This ground must be shared with AGND of TPS65950 and must not
share with AVSS4, which is the ground used by RX class-AB output stages.
In differential mode, adding a low-pass filter (made by RSB and CB) is highly
recommended if coupling between RX output stages and the microphone is too high (and
there is not enough attenuation by the echo cancellation algorithm). The coupling can
come from:
The internal TPS65950 coupling between MICBIAS.OUT voltage and RX output
stages
Coupling noise between MICBIAS.GND and AVSS4
In pseudodifferential mode, the dynamic resistance of the microphone improves the
rejection versus MICBIAS.OUT:
PSRR = 20*log((RB + RDyn_mic)/RB)
Audio/Voice Module
87
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相關代理商/技術參數
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