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參數資料
型號: TPS65930BZCHR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA139
封裝: 10 X 10 MM, 0.65 MM PITCH, GREEN, PLASTIC, NFBGA-139
文件頁數: 74/115頁
文件大小: 1232K
代理商: TPS65930BZCHR
SWCS037G
– MAY 2008 – REVISED APRIL 2011
6.2
Audio Uplink (TX) Module
The audio uplink path includes two input amplification stages:
MIC_MAIN_P, MIC_MAIN_M (differential main handset input)
AUXR (common terminal: single-ended auxiliary)
NOTE
If two audio inputs are needed, and mic bias is not needed, the AUXR input can be used
with MIC_MAIN to provide the two inputs.
6.2.1
Microphone Bias Module
A bias generator provides an external voltage of 2.2 V to bias the analog microphones (MICBIAS1
terminal). The typical output current is 1 mA.
6.2.1.1
Analog Microphone Bias Module Characteristics
Table 6-7 lists the characteristics of the analog microphone bias module.
Table 6-7. Analog Microphone Bias Module Characteristics With Bias Resistor
Parameter
Test Conditions
Min
Typ
Max
Unit
Bias voltage
2.15
2.2
2.25
V
Load current
1
mA
Output noise
P-weighted 20 Hz to 6.6 kHz
1.8
μVRMS
External capacitor
0
200
pF
Internal resistance
50
60
70
k
NOTE
If the external capacitor is higher than 200 pF, the analog microphone bias becomes
unstable. To stabilize it, add a serial resistor.
Table 6-8 lists the characteristics of the analog microphone bias module with a bias resistor.
Table 6-8. Analog Microphone Bias Module Characteristics With Bias Resistor
Parameter
Test Conditions
Min
Typ
Max
Unit
CB < 200 pF
0
RSB
CB = 100 pF
300
CB = 1 μF
500
RB + RSB
2.2 to 2.7
k
Copyright
2008–2011, Texas Instruments Incorporated
Audio/Voice Module (TPS65930 Device Only)
61
focus.ti.com: TPS65930/TPS65920
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