WM8770 datasheet(28/52 Pages) WOLFSON

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WM8770

Production Data

PD Rev 4.1 June 2005

Figure 24 Application and Release of Soft Mute

Figure 24 shows the application and release of MUTE whilst a full amplitude sinusoid is being played

at 48kHz sampling rate. When MUTE (lower trace) is asserted, the output (upper trace) begins to

decay exponentially from the DC level of the last input sample. The output will decay towards VMID

with a time constant of approximately 64 input samples. If MUTE is applied to all channels for 1024

or more input samples the DAC will be muted if IZD is set. When MUTE is de-asserted, the output

will restart immediately from the current input sample.

Note that all other means of muting the DAC channels: setting the PL[3:0] bits to 0, setting the

PDWN bit or setting attenuation to 0 will cause much more abrupt muting of the output.

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

addition both channels may be muted by setting ADCMUTE.

BIT

LABEL

DEFAULT

DESCRIPTION

11001

ADC Mute

ADCMUTE

ADC MUTE Left and Right

0 : Normal Operation

1: mute ADC left and ADC

right

11001

ADC Mute Left

MUTE

ADC Mute select

0 : Normal Operation

1: mute ADC left

11010

ADC Mute Right

MUTE

ADC Mute select

0 : Normal Operation

1: mute ADC right

The Record outputs may be enabled by setting RECEN, where RECEN enables the REC1L and

REC1R outputs.

BIT

LABEL

DEFAULT

DESCRIPTION

10100

Mute Control

RECEN

REC Output Enable

0 : REC output muted

1: REC output enabled

-2.5

-2

-1.5

-1

-0.5

0.5

1.5

0.001

0.002

0.003

0.004

0.005

0.006

Time(s)

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