WM8993 datasheet(51/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

ADCL_DAC_SVOL or

ADCR_DAC_SVOL

SIDETONE

VOLUME

(dB)

0000

-36

0001

-33

0010

-30

0011

-27

0100

-24

0101

-21

0110

-18

0111

-15

1000

-12

1001

-9

1010

-6

1011

-3

1100

1101

1110

1111

Table 18 Digital Sidetone Volume

DYNAMIC RANGE CONTROL (DRC)

The dynamic range controller (DRC) is a circuit which can be enabled in the digital data path of either

the ADCs or the DACs. The function of the DRC is to adjust the signal gain in conditions where the

input amplitude is unknown or varies over a wide range, e.g. when recording from microphones built

into a handheld system. The DRC can apply Compression and Automatic Level Control to the signal

path. It incorporates ‘anti-clip’ and ‘quick release’ features for handling transients in order to improve

intelligibility in the presence of loud impulsive noises.

The DRC is enabled as shown in Table 19. It can be enabled in the ADC digital path or in the DAC

digital path, under the control of the DRC_DAC_PATH register bit. Note that the DRC can only be

active in one of these paths at any time.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R123 (7Bh)

DRC Control 1

DRC_ENA

DRC enable

0 = disabled

1 = enabled

DRC_DAC_PAT

DRC path select

0 = ADC path

1 = DAC path

Table 19 DRC Enable

COMPRESSION/LIMITING CAPABILITIES

The DRC supports two different compression regions, specified by R0 and R1, separated by a “knee”

at input amplitude T. For signals above the knee, the compression slope R0 applies; for signals

below the knee, the compression slope R1 applies.

The overall DRC compression characteristic in “steady state” (i.e. where the input amplitude is near-

constant) is illustrated in Figure 15.

WM8993 Datasheet(PDF) 51 Page - Wolfson Microelectronics plc

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