WM8978GEFLSLASHV datasheet(38/78 Pages) WOLFSON

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WM8978

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PP Rev 1.7 January 2005

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R41 (29h)

3:0

DEPTH3D[3:0]

0000

Stereo depth

0000: 0% (minimum 3D effect)

0001: 6.67%

....

1110: 93.3%

1111: 100% (maximum 3D effect)

Table 29 3D Stereo Enhancement Function

ANALOGUE OUTPUTS

The WM8978 has three sets of stereo analogue outputs. These are:

•

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

•

LOUT2 and ROUT2 – normally used to drive an 8Ω BTL speaker.

•

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

OUT4 is right output). OUT4 can also be used to provide a mono mix of left and right

channels.

LOUT2, ROUT2, OUT3 and OUT4 are supplied from SPKVDD and are capable of driving up to

1.5Vrms signals as shown in Figure 14. LOUT1 and ROUT1 are supplied from AVDD and can only

drive out a 1V rms signal (AVDD/3.3).

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

ranges.

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

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

OUT4 mixers.

LEFT AND RIGHT OUTPUT CHANNEL MIXERS

The left and right output channel mixers are shown in Figure 14.

These mixers allow the AUX

inputs, the ADC bypass and the DAC left and right channels to be combined as desired.

This

allows a mono mix of the DAC channels to be done as well as mixing in external line-in from the

AUX or speech from the input bypass path.

The AUX and bypass inputs have individual volume control from -15dB to +6dB and the DAC volume

can be adjusted in the digital domain if required.

The output of these mixers goes to both the

headphone (LOUT1 and ROUT1) and speaker (LOUT2 and ROUT2) and can optionally go to the

OUT3 and OUT4 mixers.

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