WM8993 datasheet(212/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

212

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R125 (7Dh)

DRC Control

15:11

DRC_AMP_CO

MP [4:0]

0_0000

Compressor amplitude at threshold YT (dB)

00000 = 0dB

00001 = -0.75dB

00010 = -1.5dB

… (-0.75dB steps)

11110 = -22.5dB

11111 = Reserved

10:8

DRC_R0_SLO

PE_COMP

[2:0]

000

Compressor slope R0

000 = 1 (no compression)

001 = 1/2

010 = 1/4

011 = 1/8

100 = 1/16

101 = 0

110 = Reserved

111 = Reserved

DRC_FF_DEL

Feed-forward delay for anti-clip feature

0 = 5 samples

1 = 9 samples

Time delay can be calculated as 5/fs or 9/ fs, where fs

is the sample rate.

3:2

DRC_THRESH

_QR [1:0]

Quick release crest factor threshold

00 = 12dB

01 = 18dB (default)

10 = 24dB

11 = 30dB

1:0

DRC_RATE_Q

R [1:0]

Quick release decay rate (seconds/6dB)

00 = 0.725ms (default)

01 = 1.45ms

10 = 5.8ms

11 = Reserved

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R126 (7Eh)

DRC Control

15:13

DRC_R1_SLO

PE_COMP

[2:0]

000

Compressor slope R1

000 = 1 (no compression)

001 = 1/2

010 = 1/4

011 = 1/8

100 = 0

101 = Reserved

11X = Reserved

12:8

DRC_STARTU

P_GAIN [4:0]

0_0000

Initial gain at DRC startup

00000 = -18dB

00001 = -15dB

00010 = -12dB

00011 = -9dB

00100 = -6dB

00101 = -3dB

00110 = 0dB (default)

00111 = 3dB

01000 = 6dB

WM8993 Datasheet(PDF) 212 Page - Wolfson Microelectronics plc

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