WM8940CGEFLSLASHV datasheet(30/88 Pages) CIRRUS

30 / 88 page

WM8940

Rev 4.4

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

R32 (20h)

ALC Control 1

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

ALCSEL

ALC function select (see Note)

0 = ALC disabled

1 = ALC Enabled

R33 (21h)

ALC Control 2

3:0

ALCLVL

[3:0]

1011

(-6dB)

ALC target

– sets signal level at ADC

input

1111 = -1.5dBFS

1110 = -1.5dBFS

1101 = -3dBFS

1100 = -4.5dBFS

1011 = -6dBFS

1010 = -7.5dBFS

1001 = -9dBFS

1000 = -10.5dBFS

0111 = -12dBFS

0110 = -13.5dBFS

0101 = -15dBFS

0100 = -16.5dBFS

0011 = -18dBFS

0010 = -19.5dBFS

0001 = -21dBFS

0000 = -22.5dBFS

7:4

ALCHLD

[3:0]

0000

(0ms)

ALC hold time before gain is increased.

0000 = 0ms

0001 = 2.67ms

0010 = 5.33ms

0011 = 10.66ms

0100 = 21.32ms

0101 = 42.64ms

0110 = 85.28ms

0111 = 0.17s

1000 = 0.34s

1001 = 0.68s

1010 or higher = 1.36s

WM8940CGEFL/V Datasheet(PDF) 30 Page - Cirrus Logic

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