WM8351 datasheet(88/330 Pages) WOLFSON

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WM8351

Production Data

PD, April 2012, Rev 4.5

13.9.4

OUT3 AND OUT4

The additional analogue outputs OUT3 and OUT4 have independent mixers and can be used in a

number of different ways:



OUT3 and OUT4 as a stereo pair (OUT3 = left, OUT4 = right) to drive a headphone or line load



OUT3 or OUT4 as pseudo-ground outputs for headphones connected directly (without DC

blocking capacitors) to OUT1L/OUT1R or OUT2L/OUT2R



OUT4 as a mono mix of left and right signals

The OUT3 and OUT4 output stages are powered from HPVDD and HPGND.

If OUT4 is providing a mono mix, it is recommended to reduce the level of OUT4 by 6dB to avoid

clipping in the event of 2 full-scale signals being combined. This is implemented via the OUT4_ATT

DACR_TO_OUT4, R93[12]

MIXINR_TO_OUT4, R93[9]

Right DAC output

Right output mixer

MIXOUTR_TO_OUT4, R93[1]

Right input mixer

DACL_TO_OUT4, R93[11]

Left DAC output

OUT4

MIXER

Left output mixer

MIXOUTL_TO_OUT4, R93[0]

DACL_TO_OUT3, R92[11]

MIXINL_TO_OUT3, R92[8]

Left DAC output

Left output mixer

MIXOUTL_TO_OUT3, R92[0]

Left input mixer

OUT4_TO_OUT3, R92[3]

OUT3

MIXER

OUT3_2OUT4, R93[2]

-1

OUT3

OUT4

1/2

OUT4_ATTN,

R93[10]

Figure 49 OUT 3 and OUT4 Mixers

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