WM8972LEFLSLASHR datasheet(17/49 Pages) WOLFSON

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Preliminary Technical Data

WM8972L

PTD Rev 2.2 June 2004

DIGITAL ADC VOLUME CONTROL

The output of the ADC can be digitally amplified or attenuated over a range from –97dB to +30dB in

0.5dB steps. The gain for a given eight-bit code X is given by:

0.5

× (X-195) dB for 1 ≤ X ≤ 255;

MUTE for X = 0

The AVU control bit controls the loading of digital volume control data. When AVU is set to 0, the

ADCVOL control data will be loaded into the control register, but will not actually change the digital

gain setting. Gain settings are updated when AVU is set to 1.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:0

ADCVOL

[7:0]

11000011

( 0dB )

ADC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -97dB

0000 0010 = -96.5dB

... 0.5dB steps up to

1111 1111 = +30dB

R21 (15h)

ADC Digital

Volume

AVU

ADC Volume Update

0 = Store ADCVOL in intermediate

latch (no gain change)

1 = Update gains ( = ADCVOL)

Table 7 ADC Digital Volume Control

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