WM8993 datasheet(54/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R123 (7Bh)

DRC Control 1

3:2

DRC_MINGAIN

[1:0]

Minimum gain the DRC can use to

attenuate audio signals

00 = 0dB (default)

01 = -6dB

10 = -12dB

11 = -18dB

1:0

DRC_MAXGAIN

[1:0]

Maximum gain the DRC can use to

boost audio signals

00 = 12dB

01 = 18dB (default)

10 = 24dB

11 = 36dB

Table 21 DRC Gain Limits

DYNAMIC CHARACTERISTICS

The dynamic behaviour determines how quickly the DRC responds to changing signal levels. Note

that the DRC responds to the average (RMS) signal amplitude over a period of time.

The DRC_ATTACK_RATE determines how quickly the DRC gain decreases when the signal

amplitude is high. The DRC_DECAY_RATE determines how quickly the DRC gain increases when

the signal amplitude is low.

These register fields are described in Table 22. For general purpose microphone use, the settings

DRC_ATTACK_RATE = 0100 and DRC_DECAY_RATE = 0010 are suitable for many applications.

Note that the default setting of DRC_ATTACK_RATE is Reserved and should not be used.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R124 (7Ch)

DRC Control 2

15:12

DRC_ATTACK_

RATE [3:0]

0000

Gain attack rate (seconds/6dB)

0000 = Reserved

0001 = 181us

0010 = 363us

0011 = 726us

0100 = 1.45ms

0101 = 2.9ms

0110 = 5.8ms

0111 = 11.6ms

1000 = 23.2ms

1001 = 46.4ms

1010 = 92.8ms

1011 = 185.6ms

1100-1111 = Reserved

11:8

DRC_DECAY_R

ATE [3:0]

0000

Gain decay rate (seconds/6dB)

0000 = 186ms

0001 = 372ms

0010 = 743ms

0011 = 1.49s

0100 = 2.97s

0101 = 5.94s

0110 = 11.89s

0111 = 23.78s

1000 = 47.56s

1001-1111 = Reserved

Table 22 DRC Time Constants

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