CS4298 Datasheet, PDF (24/52 Pages) Cirrus Logic – SoundFusion Audio/Modem Codec 97 (AMC 97)

CS4298
6.1.3 Alternate Volume (Index 04h)
D15 D14 D13 D12 D11 D10 D9
D8
D7
Mute
ML5 ML4 ML3 ML2 ML1 ML0
D6
D5
D4
D3
D2
D1
D0
MR5 MR4 MR3 MR2 MR1 MR0
Mute
Master mute for the ALT_LINE_OUT_L and the ALT_LINE_OUT_R output signals.
ML[5:0]
Master Volume control for ALT_LINE_OUT_L pin. Least significant bit represents -1.5 dB with 00000 =
0 dB. The total range is 0 dB to -94.5 dB.
MR[5:0] Master Volume control for ALT_LINE_OUT_R pin. Least significant bit represents -1.5 dB with 00000 =
0 dB. The total range is 0 dB to -94.5 dB.
Default 8000h, corresponding to 0 dB attenuation and mute on.
In Mode 3 the ALT_LINE_OUT volume is controlled by the LFE/CNT Volume (Index 36h) register
in place of Alternate Volume..
ML[5:0]/MR[5:0]/MM[5:0]
Write
000000
000001
…
111111
ML[5:0]/MR[5:0]/MM[5:0
Read
000000
000001
…
111111
Gain Level
0 dB
-1.5 dB
...
-94.5 dB
Table 2. Alternate Line-Out and Master Mono Attenuation
6.1.4 Microphone Volume (Index 0Eh)
D15 D14 D13 D12 D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Mute
20dB
GN4 GN3 GN2 GN1 GN0
Mute
When set, mutes MIC1/MIC2 signal.
GN[4:0]
MIC1/MIC2 Volume Control. Least significant bit represents 1.5 dB with 01000 = 0 dB. The total range
is 12 dB to -34.5 dB.
20dB
Enables 20 dB microphone gain block.
Default 8008h, 0 dB attenuation and Mute set.
This register controls the gain level of the Microphone input source to the Input Mixer. It also con-
trols the +20 dB gain block which connects to the input volume control and to the Input Record Mux.
The selection of MIC1 or MIC2 input pins is controlled by the MS bit in the General Purpose (Index
20h) register. The gain mapping for this register is shown in Table 3.
GN4 - GN0
00000
00001
…
00111
01000
01001
…
11111
Gain Level
+12.0 dB
+10.5 dB
…
+1.5 dB
0.0 dB
-1.5 dB
…
-34.5 dB
Mic Gain with 20dB = 1
+32.0 dB
30.5 dB
...
21.5 dB
20.0 dB
18.5 dB
...
-14.5 dB
Table 3. Analog Mixer Input Gain Values
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DS315PP2