CS4294SLASHCS4298 datasheet(24/66 Pages) CIRRUS

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CS4202

DS549PP2

4.6

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).

20dB

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

block. In combination with the 10dB boost bit in the Misc. Crystal Control Register (Index 60h)

this bit allows for variable boost from 0 dB to +30 dB in steps of 10 dB. Table 3 summarizes

this behavior.

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.

Default

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

D15

D14

D13

D12

D11

D10

Mute

00000000

20dB

GN4

GN3

GN2

GN1

GN0

GN4 - GN0

Gain Level

10dB = 0,

20dB = 0

10dB = 1,

20dB = 0

10dB = 0,

20dB = 1

10dB = 1,

20dB = 1

00000

+12.0 dB

+22.0 dB

+32.0 dB

+42.0 dB

00001

+10.5 dB

+20.5 dB

+30.5 dB

+40.5 dB

…

...

00111

+1.5 dB

+11.5 dB

+21.5 dB

+31.5 dB

01000

0.0 dB

+10.0 dB

+20.0 dB

+30.0 dB

01001

-1.5 dB

+8.5 dB

+18.5 dB

+28.5 dB

…

...

11111

-34.5 dB

-24.5 dB

-14.5 dB

-4.5 dB

Table 3. Microphone Input Gain Values

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