WM8777SEFTSLASHV datasheet(57/103 Pages) WOLFSON

57 / 103 page

Pre-Production

WM8777

PP Rev 3.0 January 2005

Figure 27 Application and Release of Soft Mute

Figure 27 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.

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

REC1R outputs.

BIT

LABEL

DEFAULT

DESCRIPTION

6:5

RECLEN

RECL Output Enable

00 = REC output muted

01 = REC output ADCL

10 = REC output DAC1L

(16h)

Mute Control

8:7

RECREN

RECR Output Enable

00 = REC output muted

01 = REC output ADCR

10 = REC output DAC1R

Table 51 REC Enable Registers

-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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