CS4205_05 Datasheet, PDF (33/81 Pages) Cirrus Logic – CrystalClear® Audio Codec ’97 for Portable Computing

CS4205
5.10 Record Gain Register (Index 1Ch)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Mute 0
0
0 GL3 GL2 GL1 GL0 0
0
0
0 GR3 GR2 GR1 GR0
Mute
GL[3:0]
GR[3:0]
Default
Record Gain Mute. Setting this bit mutes the input to the L/R ADCs.
Left ADC Gain. The GL[3:0] bits control the input gain on the left channel of the analog
source, applied after the input mux and before the ADCs. Each step corresponds to 1.5 dB
gain adjustment, with 0000 = 0 dB. The total range is 0 dB to +22.5 dB gain. See Table 10 for
further details.
Right ADC Gain. The GR[3:0] bits control the input gain on the right channel of the analog
source, applied after the input mux and before the ADCs. Each step corresponds to 1.5 dB
gain adjustment, with 0000 = 0 dB. The total range is 0 dB to +22.5 dB gain. See Table 10 for
further details.
8000h. This value corresponds to 0 dB gain and Mute ‘set’.
Gx3 - Gx0 Gain Level
1111
+22.5 dB
…
…
0001
+1.5 dB
0000
0 dB
Table 10. Record Gain Values
5.11 Record Gain Mic Register (Index 1Eh)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Mute 0
0
0
0
0
0
0
0
0
0
0 GM3 GM2 GM1 GM0
Mute
GM[3:0]
Default
Mic Record Gain Mute. When ‘set’, mutes the input to the microphone ADC.
Mic ADC gain. The GM[3:0] bits control the input gain on the microphone source. The gain is
applied after the input mux and before the ADC. Each step corresponds to 1.5 dB gain ad-
justment, with 0000 = 0 dB. The total range is 0 dB to +22.5 dB gain. See Table 10 for further
details.
8000h. This value corresponds to 0 dB gain and Mute ‘set’.
DS489PP4
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