AS3543 datasheet(21/92 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

8.3.4

Parameter

AVDD17=1.7, AVDD27=2.7, TA= 25

C, unless otherwise mentioned

8.3.5

8.4

Headphone Output

The headphone output is designed to provide the audio signal with 2x40mW @ 16

Ω or 2x20mW @32Ω, which are typ-

ical values for headphones.

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.

Figure 6. Headphone Output

Table 11. Line Output Parameter

Symbol

Parameter

Condition

Min

Typ

Max

Unit

RL_LO

Load Impedance

(Stereo Mode)

line inputs nominally have 10k

CL_LO

Load Capacitance

(Stereo Mode)

100

ALO

Programmable Gain

-40.5

Gain Steps

discrete logarithmic gain steps

1.5

Gain Step Accuracy

±0.25

ALOMUTE

Mute Attenuation

100

Table 12. Line Output Related Register

Name

Base

Offset

Description

OUT_R

2-wire serial

00h

Right Line Output volume settings, MUX control

OUT_L

2-wire serial

01h

Left Line Output volume settings

AudioSet2

2-wire serial

15h

Auto fading timing settings

AudioSet3

2-wire serial

16h

Enable/disable mixer input

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