Datasheet
ADAU1761
Rev. C | Page 54 of 92
R2: Digital Microphone/Jack Detection Control, 16,392 (0x4008)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
JDDB[1:0] JDFUNC[1:0] Reserved JDPOL
Table 36. Digital Microphone/Jack Detection Control Register
Bits Bit Name Description
[7:6] JDDB[1:0] Jack detect debounce time.
Setting Debounce Time
00 5 ms (default)
01 10 ms
10
20 ms
11
[5:4] JDFUNC[1:0]
JACKDET/MICIN pin function. Enables or disables the jack detect function or configures the pin for a digital
microphone input.
40 ms
Setting Pin Function
00 Jack detect off (default)
01 Jack detect on
10
Digital microphone input
11
0 JDPOL Jack detect polarity. Detects high or low signal.
0 = detect high signal (default).
1 = detect low signal.
Reserved
R3: Record Power Management, 16,393 (0x4009)
This register manages the power consumption for the record path. In particular, the current distribution for the mixer boosts, ADCs,
record path mixers, and PGAs can be set to one of four modes. These settings are normal operation, power saving mode, enhanced
performance mode, and extreme power saving mode. Each of these modes draws current from a central bias. Enhanced performance
mode offers the highest performance with the trade-off of higher power consumption.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved MXBIAS[1:0] ADCBIAS[1:0] RBIAS[1:0] Reserved
Table 37. Record Power Management Register
Bits Bit Name Description
[6:5] MXBIAS[1:0]
Mixer amplifier bias boost. Sets the boost level for the bias current of the record path mixers. In some cases,
the boost level enhances the THD + N performance.
Setting Boost Level
00 Normal operation (default)
01 Boost Level 1
10
Boost Level 2
11
Boost Level 3
[4:3] ADCBIAS[1:0] ADC bias control. Sets the bias current for the ADCs based on the mode of operation selected.
Setting ADC Bias Control
00 Normal operation (default)
01 Extreme power saving
10
Enhanced performance
11
Power saving
[2:1] RBIAS[1:0] Record path bias control. Sets the bias current for the PGAs and mixers in the record path.
Setting Record Path Bias Control
00 Normal operation (default)
01 Reserved
10
Enhanced performance
11 Power saving