ADAU1781 Datasheet, PDF (53/88 Pages) Analog Devices – Low Noise Stereo Codec with SigmaDSP Processing Core

RECORD PATH CONFIGURATION
Register 16392 (0x4008), Digital Microphone and
Analog Beep Control
This register controls the digital microphone settings and the
analog beep input gain.
Bits[5:4], Digital Microphone Enable
These bits control the enable function for the stereo digital
microphones. The analog front end is powered down when
using a digital microphone.
ADAU1781
Bit 3, Beep Input Mute
This bit mutes the beep input.
Bits[2:0], Beep Input Gain
This bit controls the gain setting for the analog beep input; it
defaults at 0 dB and can be set as high as 32 dB. The beep signal
must be enabled in Register 16400 (0x4010), microphone bias
control and beep enable.
Table 41. Digital Microphone and Analog Beep Control Register
Bits
Description
[7:6]
Reserved
[5:4]
Digital microphone enable
00: disabled
01: MICD1 enabled
10: MICD2 enabled
11: reserved
3
Beep input mute
0: muted
1: unmuted
[2:0]
Beep input gain. Note that Setting 100 sets the input beep gain to −23 dB.
000: 0 dB
001: +6 dB
010: +10 dB
011: +14 dB
100: −23 dB
101: +20 dB
110: +26 dB
111: +32 dB
Default
00
0
000
Rev. 0| Page 53 of 88