WM8711SEDSSLASHR datasheet(36/47 Pages) WOLFSON

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Production Data

WM8711 / WM8711L

PD Rev 4.3 September 2006

DACPD: Powers down the DAC and DAC Digital Filters. If this is done dynamically then audible pops

will result unless the following guidelines are followed. In order to prevent pops, the DAC should first

be soft-muted (DACMU), the output should then be de-selected from the line and headphone output

(DACSEL), then the DAC powered down (DACPD). This is of use when the device enters Pause or

Stop modes. During DACPD the digital audio interface is remains active.

OUTPD: Powers down the Line and Headphone Outputs. If this is done dynamically then audible

pops may result unless the DAC is first soft-muted (DACMU). This is of use when the device enters

Record, Pause or Stop modes.

The device can be put into a standby mode (STANDBY) by powering down all the audio circuitry

under software control as shown in Table 20.

DESCRIPTION

STANDBY, but with Crystal Oscillator OS and CLKOUT

available

STANDBY, but with Crystal Oscillator OS available,

CLKOUT not-available

STANDBY, Crystal oscillator and CLKOUT not-available.

Table 21 Standby Mode

In STANDBY mode the Control Interface, a small portion of the digital and areas of the analogue

circuitry remain active. The active analogue includes the analogue VMID reference so that the

analogue line outputs and headphone outputs remain biased to VMID. This reduces any audible

effects caused by DC glitches when entering or leaving STANDBY mode.

The device can be powered off by writing to the POWEROFF bit of the Power Down register. In

POWEROFF mode the Control Interface and a small portion of the digital remain active. The

analogue VMID reference is disabled. Refer to Table 22.

DESCRIPTION

POWEROFF, but with Crystal Oscillator OS and

CLKOUT available

POWEROFF, but with Crystal Oscillator OS

available, CLKOUT not-available

POWEROFF, Crystal oscillator and CLKOUT

not-available.

Table 22 Poweroff Mode

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