WM8774IFT datasheet(26/42 Pages) WOLFSON

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WM8774

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PP Rev 1.0 June 2002

L/RDAX[7:0]

ATTENUATION LEVEL

00(hex)

∞ dB (mute)

01(hex)

-127.5dB

FE(hex)

-0.5dB

FF(hex)

0dB

Table 11 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

DAC OUTPUT PHASE

The DAC Phase control word determines whether the output of each DAC is non-inverted or inverted

BIT

LABEL

DEFAULT

DESCRIPTION

Bit

DAC

Phase

DACL

1 = invert

10010

DAC Phase

1:0

PH[1:0]

DACR

1 = invert

ADC GAIN CONTROL

Control bits LAG[4:0] and RAG[4:0] control the ADC input gain, allowing the user to attenuate the

ADC input signal to match the full-scale range of the ADC. The gain is independently adjustable on

left and right inputs. Left and right inputs may also be independently muted. The LRBOTH control bit

allows the user to write the same attenuation value to both left and right volume control registers. The

ADC volume and mute also applies to the bypass signal path.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

LAG[4:0]

01100

(0dB)

Attenuation data for Left channel ADC gain in 1dB steps. See Table

MUTE

Mute for Left channel ADC:

0: Mute off

1: Mute on

11001

Attenuation

ADCL

LRBOTH

Setting LRBOTH will write the same gain value to LAG[4:0] and

RAG[4:0]

4:0

RAG[4:0]

01100

(0dB)

Attenuation data for right channel ADC gain in 1dB steps. See Table

MUTE

Mute for Right channel ADC:

0: Mute off

1: Mute on

11010

Attenuation

ADCR

LRBOTH

Setting LRBOTH will write the same gain value to RAG[4:0] and

LAG[4:0]

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