AS3515_08 datasheet(9/67 Pages) AMSCO

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AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6 Detailed Functional Block Description

6.1

Line Output

6.1.1

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, the 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.

Figure 2 Line Output Mode Block Diagrams

Stero Mode

Mono Differential Mode

Please observe that gain of upper amplifier needs to be

set to 0dB

6.1.2

Enabling the output stage is done via a control bit in the audio settings register (AudioSet1 register 0x14h). The line out driver itself is

controlled by the following two registers.

Right Line Out Register (00h)

Table 4

LINE_OUT_R Register

Bit

Name

Default

Access

Description

7,6

reserved

00b

R/W

For testing purpose only, must be set to 0h

R/W

not used

4..0

LOR_VOL

00000b

R/W

volume settings for right line output, adjustable in 32 steps @ 1.5dB

11111: 6 dB gain

11110: 4.5 dB gain

00001: -39 dB gain

00000: -40.5 dB gain

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