AS3525 datasheet(129/194 Pages) AMSCO

129 / 194 page

AS3525-A/-B C22O22

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 1.13

129

- 194

7.4.5

Audio Line Output

7.4.5.1

General

The line output is designed to provide the audio signal with typical 1Vp at a load of minimum 10k

Ω, which is a minimum value for line inputs.

Additional this output amplifier is capable to drive a 32

Ω load (e.g. an earpiece of a mobile phone). To achieve this operation mode can be

switched from single ended stereo to mono differential.

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. 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 49 Line Output

Stereo Mode

Mono Differential Mode (please observe that gain of right

channel amplifier has to best to 0dB)

7.4.5.2

Parameter

Table 107 Line Output Characteristics

Symbol

Parameter

Notes

Min

Typ

Max

Unit

stereo mode

10k

Ohm

Output Load

differential mode

Ohm

Gain

programmable gain

-40.5

Gain Step-Size

1.5

SNR

Signal to Noise Ratio

stereo mode

Mute Attenuation

120

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

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