AS3517 datasheet(21/94 Pages) AMSCO

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AS3517 V17

Data Sheet, Confidential

www.austriamicrosystems.com

9.1.3

Audio Line Outputs (2x)

General

The line outputs are designed to provide the audio signal with typical 1VPEAK at a load of minimum 10k

Ω, which is a minimum value for

line inputs. If the limiters (N20/N21) are deactivated the peak output voltage is 1.45VPEAK. The load however can decrease to 64Ohm. In

addition these line output can be configured as mono differential to drive 1VPEAK @ 32

Ω load (e.g. an earpiece of a mobile phone).

This output stage has 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. A zero cross detection allows to control the actual execution of new gain settings.

If the line output is not enabled, the volume settings are set to their default values. Changing of volume and mute control can only be done

after enabling the output.

If using the output in mono differential mode, the volume setting for the right channel should be set to 0dB.

Figure 7 Line Output

Stereo Mode

Mono Differential Mode (please observe that gain of right

channel amplifier has to best to 0dB)

Parameter

Table 14 Line Output Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

RL_LO

Load Impedance

(Stereo Mode)

Ω

line inputs nominally have

10kΩ

CL_LO

Load Capacitance

(Stereo Mode)

100

ALO

Programmable Gain

-40.5

Gain Steps

1.5

discrete logarithmic gain

steps

Gain Step Accuracy

±0.25

ALOMUTE

Mute Attenuation

100

BVDD = 3.3V, TA= 25oC unless otherwise mentioned

Table 15 Line Output Related Register

Name

Base

Offset

Description

LINE_OUT1_R

2-wire serial

00h

Right Line Output 1 volume settings, MUX control

LINE_OUT1_L

2-wire serial

01h

Left Line Output 1 volume settings

LINE_OUT2_R

2-wire serial

04h

Right Line Output 2 volume settings, MUX control

LINE_OUT2_L

2-wire serial

05h

Left Line Output 2 volume settings

AudioSet_1

2-wire serial

14h

Enable/disable driver stage

AudioSet_3

2-wire serial

16h

Enable/disable mixer input

Line output have to be enabled in register 14h first before other settings in register 00h and 01h can be programmed.

Revision 1v3

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