ADAU1381 Datasheet, PDF (62/84 Pages) Analog Devices – Low Noise Stereo Codec with Enhanced Recording and Playback Processing

ADAU1381
Register 16410 (0x401A), Left ADC Attenuator
Bits[7:0], Left ADC Digital Attenuator
These bits control a 256-step, logarithmically spaced volume
control from 0 dB to −95.625 dB, in increments of 0.375 dB.
When a new value is entered into this register, the volume control
slews gradually to the new value, avoiding pops and clicks in the
process. The slew ramp is logarithmic, incrementing 0.375 dB
per audio frame.
Register 16411 (0x401B), Right ADC Attenuator
Bits[7:0], Right ADC Digital Attenuator
These bits control a 256-step, logarithmically spaced volume
control from 0 dB to −95.625 dB, in increments of 0.375 dB.
When a new value is entered into this register, the volume control
slews gradually to the new value, avoiding pops and clicks in the
process. The slew ramp is logarithmic, incrementing 0.375 dB
per audio frame.
Table 45. Left ADC Attenuator Register
Bits Description
[7:0] Left ADC digital attenuator; attenuation is in increments of 0.375 dB with each step of slewing
00000000: 0 dB
00000001: −0.375 dB
00000010: −0.75 dB
…
11111110: −95.25 dB
11111111: −95.625 dB
Table 46. Right ADC Attenuator Register
Bits Description
[7:0] Right ADC digital attenuator; attenuation is in increments of 0.375 dB with each step of slewing
00000000: 0 dB
00000001: −0.375 dB
00000010: −0.75 dB
…
11111110: −95.25 dB
11111111: −95.625 dB
Default
00000000
Default
00000000
Rev. 0 | Page 62 of 84