WM8776 datasheet(26/55 Pages) WOLFSON

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WM8776

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PP Rev 1.91 June 2004

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 34, Figure 35, Figure 36, Figure 37, Figure 38 and Figure 39 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.

WM8776 Datasheet(PDF) 26 Page - Wolfson Microelectronics plc

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