AS3543 datasheet(17/92 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 Detailed Description - Audio Functions

8.1

Audio Line Inputs (2x)

8.1.1

General

The chip features two identical line inputs. The blocks can work in 2x mono single ended or in stereo single ended

mode.

The volume control has an independent gain regulation for left and right channel with 32 steps @ 1.5dB each and

MUTE. The gain can be set from –40.5dB to +6dB. The stage is set to mute by default. If the line input is not enabled,

the volume settings are set to their default values. Changing the volume and mute control can only be done after

enabling the input.

Line Input 1 and 2 are sharing one gain stage.

Figure 3. Line Inputs

8.1.2

Parameter

AVDD17=1.7V, AVDD27=2.7V, TA= 25

C, unless otherwise mentioned

Table 7. Line Input Parameter

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VLIN

Input Signal Level

Pls observe gain settings. Max.

peak levels at any node within the

circuit shall not exceed AVDD

AVDD17

VPEAK

RLIN

Input Impedance

depending on gain setting

8-25

∆RLIN

Input Impedance Tolerance

±30

CLIN

Input Capacitance

ALIN

Programmable Gain

-40.5

Gain Steps

discrete logarithmic gain steps

1.5

Gain Step Accuracy

±0.25

ALINMUTE

Mute Attenuation

100

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