ADAU1781 Datasheet, PDF (57/88 Pages) Analog Devices – Low Noise Stereo Codec with SigmaDSP Processing Core

Register 16400 (0x4010), Microphone Bias Control and
Beep Enable
Bit 4, Beep Input Enable
This bit enables the beep signal, which is input to the BEEP pin.
Setting this bit to 0 mutes the beep signal for all output paths.
Bit 3, Microphone High Performance
This bit puts the microphone bias into high performance mode,
by offering more current to the microphone.
ADAU1781
Bit 2, Microphone Gain
Provides two voltage bias options, 0.65 × AVDD1 and 0.90 ×
AVDD1. A higher bias contributes to a higher microphone gain.
The maximum current that can be drawn from MICBIAS is 5 mA.
Bit 0, Microphone Bias Enable
This bit enables the MICBIAS output.
Table 45. Microphone Bias Control and Beep Enable Register
Bits
Description
[7:5]
Reserved
4
Beep input enable
0: disabled
1: enabled
3
Microphone high performance
0: high power
1: low performance
2
Microphone gain
0: enabled
1: disabled
1
Reserved
0
Microphone bias enable
0: disabled
1: enabled
Default
0
0
0
0
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