WM8985GEFLSLASHR datasheet(61/118 Pages) WOLFSON

61 / 118 page

Pre-Production

WM8985

PP, Rev 3.4, October 2006

3D STEREO ENHANCEMENT

The WM8985 has a digital 3D enhancement option to increase the perceived 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 both ADCs and both DACs are disabled.

The DEPTH3D setting controls the degree of stereo expansion.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R41 (29h)

3D Control

3:0

DEPTH3D

0000

Stereo depth

0000 = Disabled

0001 = 6.67%

0010 = 13.3%

0011 = 20%

0100 = 26.7%

0101 = 33.3%

0110 = 40%

0111 = 46.6%

1000 = 53.3%

1001 = 60%

1010 = 66.7%

1011 = 73.3%

1100 = 80%

1101 = 86.7%

1110 = 93.3%

1111 = 100% (maximum 3D effect)

Table 32 3D Stereo Enhancement Function

Note:

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

limiting.

ANALOGUE OUTPUTS

The WM8985 has three sets of stereo analogue outputs. These are:

•

LOUT1 and ROUT1 which are normally used to drive a headphone load.

•

LOUT2 and ROUT2 – which can be used as class D or class AB headphone

drivers.

•

OUT3 and OUT4 – can be configured as a stereo line out (OUT3 is left output and

OUT4 is right output) or a differential output. OUT4 can also be used to provide a

mono mix of left and right channels.

The outputs LOUT2 and ROUT2 are powered from AVDD2 and are capable of driving a 1V rms

signal (AVDD1/3.3).

LOUT1, ROUT1, OUT3 and OUT4 are powered from AVDD1

LOUT1, ROUT1, LOUT2 and ROUT2 have individual analogue volume PGAs with -57dB to +6dB

gain ranges.

There are four output mixers in the output signal path, the left and right channel mixers which control

the signals to headphone (and optionally the line outputs) and also dedicated OUT3 and OUT4

mixers.

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