WM8993 datasheet(56/229 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

DRC_QR_ENA

Quick release enable

0 = disabled

1 = enabled

R125 (7Dh)

DRC Control 3

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_QR

[1:0]

Quick release decay rate

(seconds/6dB)

00 = 0.725ms (default)

01 = 1.45ms

10 = 5.8ms

11 = Reserved

Table 24 DRC Quick-Release Control

GAIN SMOOTHING

The DRC includes a gain smoothing filter in order to prevent gain ripples. A programmable level of

hysteresis is also used to control the DRC gain. This improves the handling of very low frequency

input signals whose period is close to the DRC attack/decay time. DRC Gain Smoothing is enabled

by default and it is recommended to use the default register settings.

The extent of the gain smoothing filter may be adjusted or disabled using the control fields described

in Table 25.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R123 (7Bh)

DRC Control 1

DRC_SMOOTH

_ENA

Gain smoothing enable

0 = disabled

1 = enabled

DRC_HYST_EN

Gain smoothing hysteresis enable

0 = disabled

1 = enabled

5:4

DRC_THRESH_

HYST [1:0]

Gain smoothing hysteresis

threshold

00 = Low

01 = Medium (recommended)

10 = High

11 = Reserved

Table 25 DRC Gain Smoothing

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