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CS4299

4.7

Microphone Volume Register (Index 0Eh)

Mute

Microphone Mute. Setting this bit mutes the MIC1 or MIC2 signal. The selection of the MIC1 or

MIC2 input pin is controlled by the MS bit in the General Purpose Register (Index 20h).

GN[4:0]

Microphone Volume Control. The GN[4:0] bits are used to control the gain level of the Micro-

phone 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 3 for further details.

20dB

Microphone 20 dB Boost. When ‘set’, the 20dB bit enables the +20 dB microphone boost block.

This bit allows for variable boost of 0 dB or +20 dB. Table 3 summarizes this behavior.

Default

8008h. This value corresponds to 0 dB gain and Mute ‘set’.

D15

D14

D13

D12

D11

D10

Mute

20dB

GN4

GN3

GN2

GN1

GN0

GN[4:0]

Gain Level

20dB = 0

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. Microphone Input Gain Values

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