Cirrus Logic CS42L73 - Manual (Page 98)

98 DS882F1
CS42L73
6.19 Mic PreAmp and PGA Volume Control:
Channel A (Mic 1, Address 15h) and Channel B (Mic 2, Address 16h)
6.19.1 Mic PREAMP x Volume
Sets the gain of the mic preamp on channel x.
6.19.2 PGAx Volume
Normally, this control sets the attenuation/gain of the PGA on channel x. When the ALC is engaged, it
sets the maximum volume.
Note: The step size may deviate slightly from 0.5 dB. Refer to Figures 42 - 47 on page 126 .
7 6 5 4 3 2 1 0
Reserved MIC_PREAMPx PGAxVOL5 PGAxVOL4 PGAxVOL3 PGAxVOL2 PGAxVOL1 PGAxVOL0
MIC_PREAMPx Volume
0 +10 dB
1 +20 dB
PGAxVOL[5:0] Volume
01 1111 12 dB
... ...
01 1000 12 dB
... ...
00 0001 +0.5 dB
00 0000 0 dB
11 1111 -0.5 dB
... ...
11 1010 -3.0 dB (Target setting for 600 mVrms analog input amplitude)
... ...
11 0100 -6.0 dB
... ...
10 0000 -6.0 dB
Step Size: 0.5 dB