AS3543-ECTP datasheet(27/92 Pages) AMSCO

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Revision 1.11

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AS3543 3v2

Data Sheet - D e t a i l e d D e s c r i p t i o n - A u d i o F u n c t i o n s

8.5.7

DAC and ADC have to be enabled in register 14h first before other settings in register 0Eh to 11h can be programmed.

8.6

Audio Output Mixer

8.6.1

General

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

Microphone Input 1

Line Input 1/2

DAC Output

ADC Input

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

peak voltage of input signals for the mixer stage is less than AVDD17/3. 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 AVDD17/3

peak to get a proper signal for the output amplifier.

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

8.6.2

Table 16. Audio Converter Related Register

Name

Base

Offset

Description

DAC_R

2-wire serial

0Eh

DAC input volume settings

DAC_L

2-wire serial

0Fh

DAC input volume settings

ADC_R

2-wire serial

10h

ADC output volume settings, source multiplexer settings

ADC_L

2-wire serial

11h

ADC output volume settings, sampling rate settings

DAC_IF

2-wire serial

11h

DAC input digital volume settings

AudioSet1

2-wire serial

14h

Enable/disable DAC, DAC gain stage & ADC

AudioSet3

2-wire serial

16h

Enable/disable mixer input

Out_Cntr3

2-wire serial

1A-3h

Control of SDO signal and drive

PLL

2-wire serial

1A-7h

PLL sample rate settings

PMU_Enable

2-wire serial

1Ch

Enables writings to extended registers 1Ah-3 and 1Ah-7

IRQENRD_1

2-wire serial

25h

Interrupt settings for LRCK changes

Table 17. Audio Mixer Related Register

Name

Base

Offset

Description

AudioSet2

2-wire serial

15h

Enable/disable mixer stage and AGC

AudioSet3

2-wire serial

16h

Enable/disable DAC, MIC or Line Inputs to mixer stage

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