WM8985GEFL datasheet(49/118 Pages) WOLFSON

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Pre-Production

WM8985

PP, Rev 3.4, October 2006

ALCMIN

Minimum Gain (dB)

000

-12

001

-6

010

011

100

101

110

111

Table 25 ALC Min Gain Values

Note that if the ALC gain setting strays outside the ALC operating range, either by starting the ALC

outside of the range or changing the ALCMAX or ALCMIN settings during operation, the ALC will

immediately adjust the gain to return to the ALC operating range. It is recommended that the ALC

starting gain is set between the ALCMAX and ALCMIN limits.

ALC HOLD TIME (NORMAL MODE ONLY)

In Normal mode, the ALC has an adjustable hold time which sets a time delay before the ALC

begins it’s decay phase (gain increasing). The hold time is set by the ALCHLD register.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R33

ALC Control

7:4

ALCHLD

0000

ALC hold time before gain is increased.

Table 26 ALC Hold Time

If the hold time is exceeded this indicates that the signal has reached a new average level and the

ALC will increase the gain to adjust for that new average level. If the signal goes above the

threshold during the hold period, the hold phase is abandoned and the ALC returns to normal

operation.

WM8985GEFL 数据表(PDF) 49 Page - Wolfson Microelectronics plc

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