WM8770 datasheet(34/52 Pages) WOLFSON

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WM8770

Production Data

PD Rev 4.1 June 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:0

LDA4[7:0]

11111111

(0dB)

Digital Attenuation data for Left channel DACL4 in 0.5dB steps. See

Table 12

01111

Digital

Attenuation

DACL4

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store LDA4 in intermediate latch (no change to output)

1: Store LDA4 and update attenuation on all channels.

7:0

RDA4[7:0]

11111111

(0dB)

Digital Attenuation data for Right channel DACR4 in 0.5dB steps.

See Table 12

10000

Digital

Attenuation

DACR4

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store RDA4 in intermediate latch (no change to output)

1: Store RDA4 and update attenuation on all channels.

7:0

MASTDA[7:0]

11111111

(0dB)

Digital Attenuation data for all DAC channels in 0.5dB steps. See

Table 12

10001

Master

Digital

Attenuation

(all channels)

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0: Store gain in intermediate latch (no change to output)

1: Store gain and update attenuation on all channels.

L/RDAX[7:0]

ATTENUATION LEVEL

00(hex)

∞ dB (mute)

01(hex)

-127.5dB

FE(hex)

-0.5dB

FF(hex)

0dB

Table 12 Digital Volume Control Attenuation Levels

The Digital volume control also incorporates a zero cross detect circuit which detects a transition

through the zero point before updating the digital volume control with the new volume. This is

enabled by control bit DZCEN.

BIT

LABEL

DEFAULT

DESCRIPTION

10011

DAC Control

DZCEN

DAC Digital Volume Zero Cross

Enable:

0: Zero cross detect disabled

1: Zero cross detect enabled

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