Datasheet

ADAU1761
Rev. C | Page 75 of 92
R34: Playback Pop/Click Suppression, 16,424 (0x4028)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved POPMODE POPLESS
ASLEW[1:0]
Reserved
Table 68. Playback Pop/Click Suppression Register
Bits Bit Name Description
4 POPMODE
Pop suppression circuit power saving mode. The pop suppression circuits charge faster in normal operation;
however, after they are charged, they can be put into low power operation.
0 = normal (default).
1 = low power.
3 POPLESS
Pop suppression disable. The pop suppression circuits are enabled by default. They can be disabled to save
power; however, disabling the circuits increases the risk of pops and clicks.
0 = enabled (default).
1 = disabled.
[2:1] ASLEW[1:0] Analog volume slew rate for playback volume controls.
Setting Slew Rate
00 21.25 ms (default)
01 42.5 ms
10 85 ms
11 Off
R35: Playback Power Management, 16,425 (0x4029)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
HPBIAS[1:0]
DACBIAS[1:0] PBIAS[1:0]
PREN PLEN
Table 69. Playback Power Management Register
Bits Bit Name Description
[7:6] HPBIAS[1:0] Headphone bias control.
Setting Headphone Bias Control
00 Normal operation (default)
01 Extreme power saving
10 Enhanced performance
11 Power saving
[5:4] DACBIAS[1:0] DAC bias control.
Setting DAC Bias Control
00 Normal operation (default)
01 Extreme power saving
10 Enhanced performance
11 Power saving
[3:2] PBIAS[1:0] Playback path channel bias control.
Setting Playback Path Bias Control
00 Normal operation (default)
01 Reserved
10 Enhanced performance
11 Power saving
1 PREN Playback right channel enable.
0 = disabled (default).
1 = enabled.
0 PLEN Playback left channel enable.
0 = disabled (default).
1 = enabled.