WM8774 datasheet(28/42 Pages) WOLFSON

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WM8774

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PP Rev 1.0 June 2002

OUTPUT SELECT AND ENABLE CONTROL

and an input select switch for each input allowing each signal to be output individually or summed

with other signals and output on the analogue output. The default for the output is DAC playback

only. VOUT may be selected to output DAC playback, AUX, analogue bypass or a sum of these

using the output select controls MX[2:0]. For example, to select sum of DAC and AUX, set MX[2:0] to

110.

The output mixer and EVR can be powered down under control of OUTPD. Setting OUTPD will

power off the mixer and EVR and switch the analogue outputs VOUTL/R to VMIDDAC to maintain a

dc level on the output.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

MX[2:0]

001

(DAC playback)

VOUT Output select (see Figure 18)

11100

Output mux

And

Powerdown

control

OUTPD

Mixer and EVR Powerdown select

0: mixer and EVR enabled

1: mixer and EVR powered

down

MX[2:0] selects the output for VOUT.

Figure 18 MX[2:0] Output Select

SOFTWARE REGISTER RESET

Writing to register 11111 will cause a register reset, resetting all register bits to their default

values.

MX[0]

MX[1]

MX[2]

DAC

AUX

BYPASS

VOUT

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