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CS4298 Arkusz danych(PDF) 24 Page - Cirrus Logic

Numer części CS4298
Szczegółowy opis  SoundFusion Audio/Modem Codec 97 (AMC 97)
PDF  52 Pages
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Producent  CIRRUS [Cirrus Logic]
Strona internetowa  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS4298 Arkusz danych(HTML) 24 Page - Cirrus Logic

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CS4298
24
DS315PP2
6.1.3
Alternate Volume (Index 04h)
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..
6.1.4
Microphone Volume (Index 0Eh)
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.
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Mute
ML5
ML4
ML3
ML2
ML1
ML0
MR5
MR4
MR3
MR2
MR1
MR0
ML[5:0]/MR[5:0]/MM[5:0]
Write
ML[5:0]/MR[5:0]/MM[5:0
Read
Gain Level
000000
000000
0 dB
000001
000001
-1.5 dB
……
...
111111
111111
-94.5 dB
Table 2. Alternate Line-Out and Master Mono Attenuation
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Mute
20dB
GN4
GN3
GN2
GN1
GN0
GN4 - GN0
Gain Level
Mic Gain with 20dB = 1
00000
+12.0 dB
+32.0 dB
00001
+10.5 dB
30.5 dB
…
…
...
00111
+1.5 dB
21.5 dB
01000
0.0 dB
20.0 dB
01001
-1.5 dB
18.5 dB
…
…
...
11111
-34.5 dB
-14.5 dB
Table 3. Analog Mixer Input Gain Values



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