WM8776 datasheet(28/57 Pages) WOLFSON

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WM8776

Production Data

PD Rev 4.0 April 2005

ADC MUTE

Each ADC channel also has an individual mute control bit, which mutes the input to the ADC PGA.

By setting the LRBOTH bit (reg22, bit 8) both channels can be muted simultaneously.

BIT

LABEL

DEFAULT

DESCRIPTION

R21 (15h)

0010101

ADC Mute Left

MUTELA

ADC Mute select

0 : Normal Operation

1: mute ADC left

R21 (15h)

0001111

ADC Mute Right

MUTERA

ADC Mute select

0 : Normal Operation

1: mute ADC right

DE-EMPHASIS MODE

The De-emphasis filter for the DAC is enabled under the control of DEEMP.

BIT

LABEL

DEFAULT

DESCRIPTION

R9 (09h)

0001001

DAC De-emphasis

Control

DEEMPH

De-emphasis mode select:

0 : Normal Mode

1: De-emphasis Mode

Refer to Figure 35, Figure 36, Figure 37, Figure 38, Figure 39 and Figure 40 for details of the De-

Emphasis modes at different sample rates.

POWERDOWN MODE AND ADC/DAC DISABLE

Setting the PDWN register bit immediately powers down the WM8776, including the references,

overriding all other powerdown control bits. All trace of the previous input samples is removed, but all

control register settings are preserved. When PDWN is cleared, the digital filters will be re-initialised.

It is recommended that the 5-channel input mux and buffer, ADC and DAC are powered down before

setting PDWN.

BIT

LABEL

DEFAULT

DESCRIPTION

R13 (0Dh)

0001101

Powerdown Control

PDWN

Power Down Mode Select:

0 : Normal Mode

1: Power Down Mode

The ADC, DAC and HEADPHONE PGA’S may also be powered down by setting the ADCD and

DACD disable bits. Setting ADCD will disable the ADC and select a low power mode. The ADC

digital filters will be reset and will reinitialise when ADCD is reset. The DAC has a separate disable

DACD. Setting DACD will disable the DAC, mixer and output PGAs. Resetting DACD will reinitialise

the digital filters.

BIT

LABEL

DEFAULT

DESCRIPTION

ADCPD

ADC Powerdown:

0 : Normal Mode

1: Power Down Mode

DACPD

DAC Powerdown:

0 : Normal Mode

1: Power Down Mode

R13 (0Dh)

0001101

Powerdown Control

HPPD

Headphone output/PGA Power

down :

0 : HP out enabled

1 : HP out disabled

The analogue audio inputs and outputs can also be individually powered down by setting the relevant

bits in the powerdown register.

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