WM8591GEDSSLASHV datasheet(36/51 Pages) WOLFSON

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WM8591

Production Data

PD Rev 4.0 December 2005

MAXIMUM GAIN (ALC ONLY) AND MAXIMUM ATTENUATION

To prevent low level signals being amplified too much by the ALC, the MAXGAIN register sets the

upper limit for the gain. This prevents low level noise being over-amplified. The MAXGAIN register

has no effect on the limiter operation.

The MAXATTEN register sets a limit for the amount of attenuation below the static gain level that the

limiter can apply. The MAXATTEN register has no effect in ALC mode.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16 (10h)

0010000

ALC Control 1

6:4

MAXGAIN

111

(+24dB)

Set Maximum Gain for the PGA (ALC

only):

111 : +24dB

110 : +20dB

…..(-4dB steps)

010 : +4dB

001 : 0dB

000 : 0dB

Maximum Attenuation of PGA (Limiter

only)

Limiter (attenuation below static)

0000 to 0011

-3dB

0100

-4dB

….

(-1dB steps)

1110

-14dB

R20 (14h)

0010100

Limiter Control

3:0

MAXATTEN

0110

(-6dB)

1111

-15dB

When disabled, the last gain level programmed by the ALC/Limiter will remain stored in the input

PGAs. The desired fixed gain level must then be programmed manually via registers R14 and R15.

SOFTWARE REGISTER RESET

Writing any value to register 0010111 will cause a register reset, resetting all register bits to their

default values.

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