WM8510GEDSSLASHRV datasheet(22/81 Pages) WOLFSON

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WM8510

Production Data

PD Rev 4.1 December 2006

DIGITAL ADC VOLUME CONTROL

The output of the ADCs can be digitally attenuated over a range from –127dB to 0dB in 0.5dB steps.

The gain for a given eight-bit code X is given by:

Gain = 0.5 x (x–255) dB for 1

≤ x ≤ 255, MUTE for x = 0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R15

ADC Digital

Volume

7:0

ADCVOL

[7:0]

11111111

( 0dB )

ADC Digital Volume Control

0000 0000 = Digital Mute

0000 0001 = -127dB

0000 0010 = -126.5dB

... 0.5dB steps up to

1111 1111 = 0dB

Table 13 ADC Volume

INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC)

The WM8510 has an automatic PGA gain control circuit, which can function as an input peak limiter

or as an automatic level control (ALC).

The Automatic Level Control (ALC) provides continuous adjustment of the input PGA in response to

the amplitude of the input signal. A digital peak detector monitors the input signal amplitude and

compares it to a register defined threshold level (ALCLVL).

If the signal is below the threshold, the ALC will increase the gain of the PGA at a rate set by

ALCDCY. If the signal is above the threshold, the ALC will reduce the gain of the PGA at a rate set

by ALCATK.

The ALC has two modes selected by the ALCMODE register: normal mode and peak limiter mode.

The ALC/limiter function is enabled by setting the register bit R32[8] ALCSEL.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

ALCMIN

[2:0]

000 (-12dB)

Set minimum gain of PGA

000 = -12dB

001 = -6dB

010 = 0dB

011 = +6dB

100 = +12dB

101 = +18dB

110 = +24dB

111 = +30dB

5:3

ALCMAX

[2:0]

111

(+35.25dB)

Set Maximum Gain of PGA

111 = +35.25dB

110 = +29.25dB

101 = +23.25dB

100 = +17.25dB

011 = +11.25dB

010 = +5.25dB

001 = -0.75dB

000 = -6.75dB

R32 (20h)

ALC Control

ALCSEL

ALC function select

0 = ALC disabled

1 = ALC enabled

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