WM8959 datasheet(51/155 Pages) WOLFSON

51 / 155 page

Pre-Production

WM8959

PP, May 2008, Rev 3.1

The input data source for each DAC can be changed under software control using register bits

DACL_SRC and DACR_SRC. The polarity of each DAC input may also be modified using register

bits DACL_DATINV and DACR_DATINV. These register bits are described in Table 14.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DACL_SRC

Left DAC Data Source Select

0 = Left DAC outputs left channel data

1 = Left DAC outputs right channel data

R5 (05h)

DACR_SRC

Right DAC Data Source Select

0 = Right DAC outputs left channel data

1 = Right DAC outputs right channel data

DACL_DATINV

Left DAC Invert

0 = Left DAC output not inverted

1 = Left DAC output inverted

R10 (0Ah)

DACR_DATINV

Right DAC Invert

0 = Right DAC output not inverted

1 = Right DAC output inverted

Table 14 DAC Routing and Control

DAC INTERFACE VOLUME BOOST

A digital gain function is available at the audio interface to boost the DAC volume when a small

signal is received on DACDAT. This is controlled using register bits DAC_BOOST[1:0]. To prevent

clipping at the DAC input, this function should not be used when the boosted DAC data is expected

to be greater than 0dBFS.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

11:10

DAC_BOOST

[1:0]

00b

DAC Input Volume Boost

00 = 0dB

01 = +6dB (Input data must not

exceed -6dBFS)

10 = +12dB (Input data must not

exceed -12dBFS)

11 = +18dB (Input data must not

exceed -18dBFS)

Table 15 DAC Interface Volume Boost

WM8959 Datasheet(PDF) 51 Page - Wolfson Microelectronics plc

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