WM8758B datasheet(47/90 Pages) WOLFSON

47 / 90 page

Production Data

WM8758B

PD, Rev 4.4, January 2012

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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 23 DAC Digital Limiter Control

5-BAND GRAPHIC EQUALISER

A 5-band graphic equalizer is provided, which can be applied to the ADC or DAC path, together with

3D enhancement, under control of the EQ3DMODE register bit. The ADCs and DACs should be

disabled before changing the EQ3DMODE bit.

By default, the WM8758B operates in low power mode, and the DSP core runs at half of the normal

rate. In DAC low power mode, only 2-Band equalizer functionality is permitted, where only Band 1

(low shelf) and Band 5 (high shelf) can be used. For ADC low power, the equalizer and 3D cannot be

used. To enable full 5-band operation, set M128ENB = 1.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R18

EQ Control 1

EQ3DMODE

0 = Equaliser and 3D Enhancement

applied to ADC path

1 = Equaliser and 3D Enhancement

applied to DAC path

Table 24 EQ and 3D Enhancement DAC or ADC Path Select

The equalizer 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

R18

EQ Band 1

Control

4:0

EQ1G

01100

(0dB)

Band 1 Gain Control. See Table 30 for

details.

6:5

EQ1C

Band 1 Cut-off Frequency:

00 = 80Hz

01 = 105Hz

10 = 135Hz

11 = 175Hz

Table 25 EQ Band 1 Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R19

EQ Band 2

Control

4:0

EQ2G

01100

(0dB)

Band 2 Gain Control. See Table 30 for

details.

6:5

EQ2C

Band 2 Centre Frequency:

00 = 230Hz

01 = 300Hz

10 = 385Hz

11 = 500Hz

EQ2BW

Band 2 Bandwidth Control

0 = narrow bandwidth

1 = wide bandwidth

Table 26 EQ Band 2 Control

WM8758B Datasheet(PDF) 47 Page - Wolfson Microelectronics plc

WM8758B Datasheet(HTML) 47 Page - Wolfson Microelectronics plc

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