Cirrus Logic CS4297A - Manual (Page 24)

CS4297A
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4.8 Stereo Analog Mixer Input Gain Registers (Index 10h - 18h)
Mute Stereo Input Mute. Setting this bit mutes the respective input signal, both right and left inputs.
GL[4:0] Left Volume Control. The GL[4:0] bits are used to control the gain level of the left analog input
source to the Input Mixer. Each step corresponds to 1.5 dB gain adjustment, with 01000 = 0 dB.
The total range is +12 dB to -34.5 dB gain. See Table 4 for further details.
GR[4:0] Right Volume Control. The GR[4:0] bits are used to control the gain level of the right analog in-
put source to the Input Mixer. Each step corresponds to 1.5 dB gain adjustment, with 01000 =
0 dB. The total range is +12 dB to -34.5 dB gain. See Table 4 for further details.
Default 8808h. This value corresponds to 0 dB gain and Mute ‘set’.
The Stereo Analog Mixer Input Gain Registers are listed in Table 5.
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Mute 0 0 GL4 GL3 GL2 GL1 GL0 0 0 0 GR4 GR3 GR2 GR1 GR0
Gx[4:0] Gain Level
00000 +12.0 dB
00001 +10.5 dB
… …
00111 +1.5 dB
01000 0.0 dB
01001 -1.5 dB
… …
11111 -34.5 dB
Table 4. Analog Mixer Input Gain Values
Register Index Function
10h Line In Volume
12h CD Volume
14h Video Volume
16h Aux Volume
18h PCM Out Volume
Table 5. Stereo Volume Register Index
24 DS318PP6
CS4297A