WM8976 datasheet(42/83 Pages) WOLFSON

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WM8976

Preliminary Technical Data

PTD Rev 2.0 February 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ4G

01100

(0dB)

Band 4 Gain Control. See Table 31 for

details

6:5

EQ4C

Band 4 Centre Frequency:

00=1.8kHz

01=2.4kHz

10=3.2kHz

11=4.1kHz

R21

EQ Band 4

Control

EQ4BW

Band 4 Bandwidth Control

0=narrow bandwidth

1=wide bandwidth

Table 29 EQ Band 4 Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ5G

01100

(0dB)

Band 5 Gain Control. See Table 31 for

details.

R22

EQ Band 5

Gain Control

6:5

EQ5C

Band 5 Cut-off Frequency:

00=5.3kHz

01=6.9kHz

10=9kHz

11=11.7kHz

Table 30 EQ Band 5 Control

GAIN REGISTER

GAIN

00000

+12dB

00001

+11dB

00010

+10dB

…. (1dB steps)

01100

0dB

01101

-1dB

11000 to 11111

-12dB

Table 31 Gain Register Table

3D STEREO ENHANCEMENT

The WM8976 has a digital 3D enhancement option to artificially increase the separation between the

left and right channels. Selection of 3D for playback is controlled by register bit EQ3DMODE.

Switching the EQ/3D bit from record to playback or from playback to record may only be done when

ADC and DAC are disabled. The WM8976 control interface will only allow EQ3DMODE to be

changed when ADC and DAC are disabled (ie ADCENL = 0, DACENL = 0 and DACENR = 0).

The DEPTH3D setting controls the degree of stereo expansion.

When 3D enhancement is used, it may be necessary to attenuate the signal by 6dB to avoid limiting.

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