WM8741 datasheet(42/63 Pages) WOLFSON

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WM8741

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PP Rev 1.3 October 2007

DIGITAL FILTER SELECTION

The WM8741 includes a wide range of digital filters. A limited set of these can be selected in

hardware control mode as listed in Table 48. Full details of each digital filter response can be found

in section PCM Digital Filter Selection, from page 38.

NAME

DESCRIPTION

Digital filter selection

(32/44.1/48kHz):

0 = Response 1

1 = Response 4

Z = Response 5

FSEL/

DINR

Digital filter selection (88.2/96kHz

and 176.4/192kHz):

0 = Response 3

1 = Response 1

Z = Response 2

Table 48 FSEL/DINR Hardware Control Pin Function

There is no choice of digital filters in DSD Direct mode – only the very minimal filtering described in

Table 66 is available.

DIFFERENTIAL MONO MODE

If DIFFHW (pin 6) is held to Logic 1, hardware controlled differential mono mode is selected. This

overrides any other control pin or register bit. Differential mono mode allows the user to build a dual

differential stereo DAC implementation with higher performance and differential output. DIFFHW is

used in conjunction with MODE/LRSEL (pin 24) to define a ‘left’ or ‘right’ DAC as shown in Table 49.

PIN NUMBER

NAME

DIFFHW

MODE/LRSEL

DESCRIPTION

Hardware control (stereo)

2-wire Software Control

3-wire software control)

Mono Left – differential outputs

VOUTLP = left channel

VOUTLN = left channel inverted

VOUTRP = left channel inverted

VOUTRN = left channel

Mono right – differential outputs

VOUTLP = right channel inverted

VOUTLN = right channel

VOUTRP = right channel

VOUTRN = right channel inverted

Table 49 DIFFHW and MODE/LRSEL Hardware Control Pin Functions

Differential mono mode is available for all PCM hardware controlled modes and DSD Direct hardware

mode.

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