AS3658F-BCTP datasheet(109/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption- Audio Functi ons

9.9

Audio Output Mixer

9.9.1 General

The mixer stage sums up the audio signals of the following stages

Microphone Input

Line Input

Digital Audio Input (DAC)

The mixing ratios have to be with the volume registers of the corresponding input stages. Please be sure that the input

signals of the mixer stage are not higher than 1Vp. If summing up several signals, each individual signal has of course

to be accordingly lower. This shall insure that the output signal is also not higher than 1Vp to get a proper signal for the

output amplifier.

This stage features an automatic gain control (AGC), which automatically avoids clipping.

9.9.2 Register Description

msup_off

R/W

microphone supply on if mic_on=1

microphone supply off

Table 113. AudioSet_3 Register

Addr:76

Audio_set3 register

Configures the mixer inputs and AGC

Bit

Bit Name

Default

Access

Description

pll_mode

R/W

Preset of PLL bias for the following sampling

frequencies

16-48kS

8-12kS

hp_pulld_en

R/W

Controls the pulldown of the HP1 if HP2is enabled and

HP2, if HP1 is enabled

Pulldown disabled if hp_on=1

Pulldown of the not used HP1/2 output

enabled, if hp_on=1

voxm_on

R/W

Switches on the voice recognition

0OFF

1ON

mic_on

R/W

Switches on the microphone amplifier

0OFF

1ON

Table 112. MIC_L Register

Addr:88

MIC_L

Left Microphone Input Register

Configures the gain from microphone amplifier output

Bit

Bit Name

Default

Access

Description

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