CS4205 查看數據表（PDF） - Cirrus Logic

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CS4205

CrystalClear® Audio Codec ’97 for Portable Computing

Cirrus Logic 

CS4205

5.8 Analog Mixer Input Gain Registers (Index 10h - 18h)

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

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 7 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

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 7 for further details.

Default

8808h. This value corresponds to 0 dB gain and Mute ‘set’.

The Analog Mixer Input Gain Registers are listed in Table 8.

Gx4 - Gx0 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 7. 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 8. Analog Mixer Input Gain Register Index

DS489PP4

31

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