WM8974 datasheet(35/63 Pages) WOLFSON

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WM8974

PP Rev 1.1 September 2004

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

SPKZC

Speaker Volume control zero cross

enable:

1 = Change gain on zero cross only

0 = Change gain immediately

SPKMUTE

Speaker output mute enable

0=Speaker output enabled

1=Speaker output muted (VMIDOP)

R54

Speaker

volume control

5:0

SPKRVOL

[5:0]

111001

(0dB)

Speaker Volume Adjust

111111 = +6dB

111110 = +5dB

… (1.0 dB steps)

111001=0dB

…

000000=-57dB

Table 22 SPKROUT Volume Control

ZERO CROSS TIMEOUT

A zero-cross timeout function is also provided so that if zero cross is enabled on the input or output

PGAs the gain will automatically update after a timeout period if a zero cross has not occurred. This

is enabled by setting SLOWCLKEN. The timeout period is dependent on the clock input to the digital

and is equal to 2

21 * input clock period.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Additional

control

SLOWCLKEN

Slow clock enable. Used for both the jack

insert detect debounce circuit and the

zero cross timeout.

0 = slow clock disabled

1 = slow clock enabled

Table 23 Timeout Clock Enable Control

MONO MIXER AND OUTPUT

The MONOOUT pin can drive a 16

Ω or 32Ω headphone or a line output or be used as a DC

reference for a headphone output (see Headphone Output section). It can be selected to drive out

any combination of DAC, Bypass (output of input BOOST stage) and AUX. This output is enabled

by setting bit MONOEN.

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