WM8940CGEFLSLASHV datasheet(35/91 Pages) WOLFSON

Part #	WM8940CGEFL/V

Description	Mono CODEC with Speaker Driver

PDF	91 Pages

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Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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35 / 91 page

Production Data

WM8940

PD, Rev 4.3, November 2011

MINIMUM AND MAXIMUM GAIN

The ALCMIN and ALCMAX register bits set the minimum/maximum gain value that the PGA can be

set to whilst under the control of the ALC. This has no effect on the PGA when ALC is not enabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R32

ALC Control 1

5:3

ALCMAX

111

Set Maximum Gain of PGA

2:0

ALCMIN

000

Set minimum gain of PGA

Table 23 ALC Max/Min Gain

In normal mode, ALCMAX sets the maximum boost which can be applied to the signal. In limiter

mode, ALCMAX will normally have no effect (assuming the starting gain value is less than the

maximum gain specified by ALCMAX) because the maximum gain is set at the starting gain level.

ALCMIN sets the minimum gain value which can be applied to the signal.

Figure 14 ALC Min/Max Gain

ALCMAX

Maximum Gain (dB)

111

35.25

110

29.25

101

23.25

100

17.25

011

11.25

010

5.25

001

-0.75

000

-6.75

Table 24 ALC Max Gain Values

WM8940CGEFL/V Datasheet(PDF) 35 Page - Wolfson Microelectronics plc

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