WM8978GEFLSLASHV datasheet(37/78 Pages) WOLFSON

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WM8978

PP Rev 1.7 January 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ4G

01100

(0dB)

Band 4 Gain Control. See Table 28 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 26 EQ Band 4 Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

4:0

EQ5G

01100

(0dB)

Band 5 Gain Control. See Table 28 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 27 EQ Band 5 Control

GAIN REGISTER

GAIN

00000

+12dB

00001

+11dB

00010

+10dB

…. (1dB steps)

01100

0dB

01101

-1dB

11000 to 11111

-12dB

Table 28 Gain Register Table

3D STEREO ENHANCEMENT

The WM8978 has a digital 3D enhancement option to artificially increase the separation between the

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

EQ3DMODE. Switching this bit from record to playback or from playback to record may only be done

when ADC and DAC are disabled. The WM8978 control interface will only allow EQ3DMODE to be

changed when ADC and DAC are disabled (ie ADCENL = 0, ADCENR = 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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