XE3005 데이터 시트보기 (PDF) - Semtech Corporation

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XE3005

Low-Power Audio CODEC

Semtech Corporation 

XE3005/XE3006

2.1.2 MIC Input

The programmable pre-amplifier and the microphone bias sources VREG11 or VREG16 are optimized to operate with

electret microphones. VREG11 provides a 1.1 V reference voltage. The VREG11 can deliver up to 50 µA. VREG11 is

enabled through control register E. VREG16 is a regulated voltage of typically 1.6V and can deliver up to 1 mA.VREG16

is always enabled.

Vcc

0.1µF

1µF 1µF

390kΩ

4 VDD

5 NRESET

6 VSSA

7 VREG16

8 VREF

9 VSSA

10 VSSD

11 VREG11

1kΩ

AIN

12

50 pF (gain is 5)

200 pF (gain is 20)

GND

Figure 4: Typical microphone interface (1.1 V / 50 uA bias through VREG11)

© Semtech 2005

Vcc

1kΩ*

0.1µF

1µF 1µF

390kΩ

4 VDD

5 NRESET

6 VSSA

7 VREG16

8 VREF

9 VSSA

10 VSSD

11 VREG11

12 AIN

50 pF (gain is 5)

200 pF (gain is 20)

*depends on microphone type

GND

Figure 5: Typical microphone interface (1.6 V / 1 mA bias through VREG16)

6

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