AS3543 datasheet(20/92 Pages) AMSCO

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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

8.2.7

8.3

Line Output

8.3.1

General

The line output is designed to provide the audio signal with a typical VPEAK level at a load of minimum 10kΩ, which is a

minimum value for line inputs. If the limiters (N20/N21) are deactivated the peak output voltage is AVDD17/2 Vp.

This AFE has a combined output stage for headphone and line output with an independent gain regulation for left and

right channel with 32 steps @ 1.5dB each. The gain can be set from -40.5dB to +6dB.

If the line output is not enabled, the volume settings are set to their default values. Changing of volume and mute con-

trol can only be done after enabling the output.

Figure 5. Line Output

8.3.2

Auto Fading

By setting a new output volume level, the stage does a automatic fading from the current gain setting to the new target.

Changing the input multiplexer from one source to another will be done by fadeing out to mute, source changing and

fading in of the new source to the target volume. Change from HPH-out to LINE-out is done by fading out of HPH-out

to mute and fading in of the LINE-out to the target volume.

The fading speed can be programmed to 3 different speed levels. The immediate response can be selected as 4th

state.

8.3.3

Ground Noise Cancelation

A separate ground input allows to connect a ground sense line direct from the dock connector ground or line out jack

shield to make the audio output independent from PCB ground noise.

Table 10. Microphone Input Related Register

Name

Base

Offset

Description

MIC_R

2-wire serial

06h

Right Microphone Input volume settings, AGC control

MIC_L

2-wire serial

07h

Left Microphone Input volume settings, MIC supply control

AudioSet1

2-wire serial

14h

Enable/disable driver stage

AudioSet3

2-wire serial

16h

Enable/disable mixer input

IRQENRD_1

2-wire serial

24h

Interrupt settings for microphone voice activation

IRQENRD_3

2-wire serial

26h

Interrupt settings for microphone detection

IRQENRD_4

2-wire serial

27h

Interrupt settings for remote button press detection

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