Analog Devices ADAU1961 Manual page 50

ADAU1961
R9: Right Differential Input Volume Control, 16,399 (0x400F)
This register enables the differential path and sets the volume control for the right differential PGA input.
Bit 7 Bit 6
Table 34. Right Differential Input Volume Control Register
Bits Bit Name
[7:2] RDVOL[5:0]
1 RDMUTE
0 RDEN
R10: Record Microphone Bias Control, 16,400 (0x4010)
This register controls the MICBIAS pin settings for biasing electret type analog microphones.
Bit 7 Bit 6
Table 35. Record Microphone Bias Control Register
Bits Bit Name
3 MPERF
2 MBI
0 MBIEN
Downloaded from Elcodis.com electronic components distributor
Bit 5 Bit 4
RDVOL[5:0]
Description
Right channel differential PGA input volume control. The right differential input uses the RINP (positive signal)
and RINN (negative signal) pins. Each step corresponds to a 0.75 dB increase in gain. See Table 69 for a complete
list of the volume settings.
Setting
000000
000001
...
010000
...
111110
111111
Right differential input mute control.
0 = mute (default).
1 = unmute.
Right differential PGA enable. When enabled, the RINP and RINN pins are used as a full differential pair. When
disabled, these two pins are configured as two single-ended inputs with the signals routed around the PGA.
0 = disabled (default).
1 = enabled.
Bit 5 Bit 4
Reserved
Description
Microphone bias is enabled for high performance or normal operation. High performance operation sources
more current to the microphone.
0 = normal operation (default).
1 = high performance.
Microphone voltage bias as a fraction of AVDD.
0 = 0.90 × AVDD (default).
1 = 0.65 × AVDD.
Enables the MICBIAS output.
0 = disabled (default).
1 = enabled.
Bit 3 Bit 2
Volume
−12 dB (default)
−11.25 dB
...
0 dB
...
34.5 dB
35.25 dB
Bit 3 Bit 2
MPERF MBI
Rev. 0 | Page 50 of 76
Bit 1 Bit 0
RDMUTE RDEN
Bit 1 Bit 0
Reserved MBIEN