CS4294 datasheet(20/42 Pages) CIRRUS

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CS4294

DS326PP4

6.1.5

Stereo Analog Mixer Input Gain (Index’s 10h - 12h, 16h - 18h)

Mute

When set mutes the respective input. Setting this bit mutes both right and left inputs.

GL[4:0]

Left Volume Control. Least significant bit represents 1.5 dB with 01000 = 0 dB. The total range is 12 dB

to -34.5 dB. See Table 3.

GR[4:0]

Right Volume Control. Least significant bit represents 1.5 dB with 01000 = 0 dB. The total range is 12

dB to -34.5 dB. See Table 3.

Default

8808h, 0 dB gain with Mute enabled.

These registers control the gain levels of the analog input sources to the Input Mixer. The analog in-

puts associated with registers 10h-18h are found in Table 4.

6.1.6

Input Mux Select (Index 1Ah)

SL[2:0]

Left Channel ADC input source select.

SR[2:0]

Right Channel ADC input source select.

Default

0000h, MIC inputs selected for both channels.

When capturing PCM data, this register controls the input MUX for the ADCs. Table 5 below lists

the possible values for each input.

D15

D14

D13

D12

D11

D10

Mute

GL4

GL3

GL2

GL1

GL0

GR4

GR3

GR2

GR1

GR0

Function

10h

Line IN Volume

12h

CD Volume

16h

Aux Volume

18h

PCM Out Volume

Table 4. Stereo Volume Register Index

D15

D14

D13

D12

D11

D10

SL2

SL1

SL0

SR2

SR1

SR0

Sx2 - Sx0

Record Source

0MIC

CD Input

Not Available

AUX Input

Line Input

5Stereo Mix

Mono Mix

Not Available

Table 5. Input Mux Selection

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