Datasheet

ADAU1761
Rev. C | Page 77 of 92
R38: DAC Control 2, 16,428 (0x402C)
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
RDAVOL[7:0]
Table 72. DAC Control 2 Register
Bits Bit Name Description
[7:0] RDAVOL[7:0]
Controls the digital volume attenuation for right channel inputs from the right DAC. Each bit corresponds to a
0.375 dB step with slewing between settings. See Table 94 for a complete list of the volume settings.
Setting Volume Attenuation
00000000 0 dB (default)
00000001 −0.375 dB
00000010
−0.75 dB
…
…
11111110
−95.25 dB
11111111 −95.625 dB
R39: Serial Port Pad Control, 16,429 (0x402D)
The optional pull-up/pull-down resistors are nominally 250 k. When enabled, these pull-up/pull-down resistors set the serial port
signals to a defined state when the signal source becomes three-state.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
ADCSDP[1:0] DACSDP[1:0] LRCLKP[1:0] BCLKP[1:0]
Table 73. Serial Port Pad Control Register
Bits Bit Name Description
[7:6] ADCSDP[1:0] ADC_SDATA pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11
Pull-down
[5:4] DACSDP[1:0] DAC_SDATA pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11
Pull-down
[3:2] LRCLKP[1:0] LRCLK pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11
Pull-down
[1:0] BCLKP[1:0] BCLK pad pull-up/pull-down configuration.
Setting Configuration
00 Pull-up
01 Reserved
10
None (default)
11 Pull-down