Cirrus Logic CS4297A - Manual (Page 21)

CS4297A
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4.3 Alternate Volume Register (Index 04h)
Mute Alternate Mute. Setting this bit mutes the ALT_LINE_OUT_L/R output signals.
ML[4:0] Alternate Volume Left. These bits control the left alternate output volume. Each step corre-
sponds to 1.5 dB gain adjustment, with 00000 = 0 dB. The total range is 0 dB to -46.5 dB atten-
uation. See Table 2 for further attenuation levels.
ML5 Alternate Volume Left Max Attenuation. Setting ML5 sets the left channel attenuation to
-46.5 dB by forcing ML[4:0] to a ‘1’ state. ML[5:0] will read back 011111 when ML5 has been
‘set’. Table 2 summarizes this behavior.
MR[4:0] Alternate Volume Right. These bits control the right alternate output volume. Each step corre-
sponds to 1.5 dB gain adjustment, with 00000 = 0 dB. The total range is 0 dB to -46.5 dB atten-
uation. See Table 2 for further attenuation levels.
MR5 Alternate Volume Right Max Attenuation. Setting MR5 sets the right channel attenuation to
-46.5 dB by forcing MR[4:0] to a ‘1’ state. MR[5:0] will read back 011111 when MR5 has been
‘set’. Table 2 summarizes this behavior.
Default 8000h. This value corresponds to 0 dB attenuation and Mute ‘set’.
4.4 Mono Volume Register (Index 06h)
Mute Mono Mute. Setting this bit mutes the MONO_OUT signal.
MM[5:0] Mono Volume. These bits control the mono output volume. Each step corresponds to 1.5 dB
gain adjustment, with a total available range from 0 dB to -46.5 dB attenuation. See Table 2 for
further attenuation levels.
MM5 Mono Volume Max Attenuation. Setting the MM5 bit sets the mono attenuation to -46.5 dB by
forcing MM[4:0] to a ‘1’ state. MM[5:0] will read back 011111 when MM5 has been ‘set’. Table 2
summarizes this behavior.
Default 8000h. This value corresponds to 0 dB attenuation and Mute ‘set’.
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Mute 0 ML5 ML4 ML3 ML2 ML1 ML0 0 0 MR5 MR4 MR3 MR2 MR1 MR0
Mx[5:0]
Write
Mx[5:0]
Read
Gain
Level
000000 000000 0 dB
000001 000001 -1.5 dB
… … ...
011111 011111 -46.5 dB
100000 011111 -46.5 dB
... ... ...
111111 011111 -46.5 dB
Table 2. Analog Mixer Output Attenuation
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 MM5 MM4 MM3 MM2 MM1 MM0
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CS4297A