WM8976 datasheet(46/108 Pages) WOLFSON

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WM8976

Pre-Production

PP Rev 3.0 April 2006

6:4

LIMLVL

000

Programmable signal threshold level

(determines level at which the limiter

starts to operate)

000=-1dB

001=-2dB

010=-3dB

011=-4dB

100=-5dB

101 to 111=-6dB

Table 29 DAC Digital Limiter Control

5-BAND GRAPHIC EQUALISER

A 5-band graphic equaliser (EQ) is provided, which can be applied to the ADC or DAC path, together

with 3D enhancement, under control of the EQ3DMODE register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R18

EQ Control 1

EQ3DMODE

0 = Equaliser applied to ADC path

1 = Equaliser and 3D Enhancement

applied to DAC path

Table 30 EQ and 3D Enhancement DAC or ADC Path Select

The equaliser consists of low and high frequency shelving filters (Band 1 and 5) and three peak

filters for the centre bands. Each has adjustable cut-off or centre frequency, and selectable boost

(+/- 12dB in 1dB steps). The peak filters have selectable bandwidth.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ1G

01100

(0dB)

Band 1 Gain Control. See Table 36 for

details.

R18

EQ Band 1

Control

6:5

EQ1C

Band 1 Cut-off Frequency:

00=80Hz

01=105Hz

10=135Hz

11=175Hz

Table 31 EQ Band 1 Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ2G

01100

(0dB)

Band 2 Gain Control. See Table 36 for

details.

6:5

EQ2C

Band 2 Centre Frequency:

00=230Hz

01=300Hz

10=385Hz

11=500Hz

R19

EQ Band 2

Control

EQ2BW

Band 2 Bandwidth Control

0=narrow bandwidth

1=wide bandwidth

Table 32 EQ Band 2 Control

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