WM8974 datasheet(31/63 Pages) WOLFSON

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WM8974

PP Rev 1.1 September 2004

GRAPHIC EQUALISER

A 5-band graphic EQ is provided, which can be applied to the ADC or DAC path under control of the

EQMODE register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R18

EQ Control 1

EQMODE

0 = Equaliser applied to ADC path

1 = Equaliser applied to DAC path

Table 12 EQ 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 18 for

details.

R18

EQ Band 1

Control

6:5

EQ1C

Band 1 Cut-off Frequency:

00=80Hz

01=105Hz

10=135Hz

11=175Hz

Table 13 EQ Band 1 Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ2G

01100

(0dB)

Band 2 Gain Control. See Table 18 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 14 EQ Band 2 Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ3G

01100

(0dB)

Band 3 Gain Control. See Table 18 for

details.

6:5

EQ3C

Band 3 Centre Frequency:

00=650Hz

01=850Hz

10=1.1kHz

11=1.4kHz

R20

EQ Band 3

Control

EQ3BW

Band 3 Bandwidth Control

0=narrow bandwidth

1=wide bandwidth

Table 15 EQ Band 3 Control

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