WM8753LEBSLASHRV datasheet(45/87 Pages) WOLFSON

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WM8753L

Advanced Information

AI Rev 3.1 June 2004

OUT4 OUTPUT

The OUT4 output can be used to output a buffered Vmid for driving a mono or stereo headset in

capless mode, output the signal from the record mixer or drive out an inverted LOUT2 signal. The

output mode is determined by OUT4SW[1:0]. This output is enabled by setting register bit OUT4 high.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R63 (3Fh)

Additional

Control

8:7

OUT4SW

[1:0]

OUT4 Output select

00 = VREF

01 = Record Mixer

10 = LOUT2 signal

(volume controlled by LOUT2VOL)

11 = unused

Table 40 OUT4SW control of OUT4

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 TOEN. The timeout period is dependent on the clock input to the digital and is

equal to 2

21 * input clock period. The timeout clock may be set to be derived from either the mclk or

pcmclk using SLWCLK..

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R18 (12h)

Additional

Control

TOEN

Timeout clock enable

0 = timeout clock disabled

1 = timeout clock enabled

R52 (34h)

Clock Control

SLWCLK

Timeout and Headphone switch clock

source

0 = mclk

1 = pcm clk

Table 41 Timeout Clock Controls

ENABLING THE OUTPUTS

Each analogue output of the WM8753L can be separately enabled or disabled. The analogue mixer

associated with each output is powered on or off along with the output pin. All outputs are disabled by

default. To save power, unused outputs should remain disabled.

Outputs can be enabled at any time, except when VREF is disabled (VR=0), as this may cause pop

noise (see “Power Management” and “Applications Information” sections)

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LOUT1

LOUT1 Enable

ROUT1

ROUT1 Enable

LOUT2

LOUT2 Enable

ROUT2

ROUT2 Enable

OUT3

OUT3 Enable

OUT4

OUT4 Enable

MONO1

MONO1 Enable

R22 (16h)

Power

Management

(3)

MONO2

MONO2 Enable

Note: All “Enable” bits are 1 = ON, 0 = OFF

Table 42 Analogue Output Control

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