WM8948ECSSLASHR datasheet(44/189 Pages) WOLFSON

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WM8948

Production Data

PD, May 2011, Rev 4.1

GAIN LIMITS

The minimum and maximum gain applied by the DRC is set by register fields DRC_MINGAIN,

DRC_MAXGAIN and DRC_NG_MINGAIN. These limits can be used to alter the DRC response from

that illustrated in Figure 18. If the range between maximum and minimum gain is reduced, then the

extent of the dynamic range control is reduced.

The minimum gain in the Compression regions of the DRC response is set by DRC_MINGAIN. The

minimum gain in the Noise Gate region is set by DRC_NG_MINGAIN. The minimum gain limit

prevents excessive attenuation of the signal path.

The maximum gain limit set by DRC_MAXGAIN prevents quiet signals (or silence) from being

excessively amplified.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R30 (1Eh)

DRC Control 2

12:9

DRC_NG_

MINGAIN [3:0]

0110

Minimum gain the DRC can use to

attenuate audio signals when the

noise gate is active.

0000 = -36dB

0001 = -30dB

0010 = -24dB

0011 = -18dB

0100 = -12dB

0101 = -6dB

0110 = 0dB

0111 = 6dB

1000 = 12dB

1001 = 18dB

1010 = 24dB

1011 = 30dB

1100 = 36dB

1101 to 1111 = Reserved

4:2

DRC_MINGAIN

[2:0]

001

Minimum gain the DRC can use to

attenuate audio signals

000 = 0dB

001 = -12dB (default)

010 = -18dB

011 = -24dB

100 = -36dB

101 = Reserved

11X = Reserved

1:0

DRC_MAXGAIN

[1:0]

Maximum gain the DRC can use to

boost audio signals (dB)

00 = 12dB

01 = 18dB

10 = 24dB

11 = 36dB

Table 18 DRC Gain Limits

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