WM8351 datasheet(78/330 Pages) WOLFSON

78 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

13.8 OUTPUT SIGNAL PATH

The analogue output pins produce audio signals to drive headphones, line-out connections and/or

external loudspeaker amplifiers. These pins include:



OUT1L and OUT1R



OUT2L and OUT2R



OUT3 and OUT4

OUT1L, OUT1R, OUT2L and OUT2R have individual analogue volume PGAs with -57dB to +6dB

ranges. AC-coupled and Capless headphone drive modes are available. Common mode noise

rejection is possible using the HPCOM connection.

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

output). OUT3 and OUT4 can also be used as a Vmid buffer to provide a “ground” reference for

headphone outputs, eliminating the need for DC blocking capacitors.

Alternatively, OUT4 can be used to provide a mono mix of left and right channels.

All analogue output pins are powered through the HPVDD and HPGND pins.

Each output can drive a headphone load down to 16

.

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.

13.8.1

ENABLING THE ANALOGUE OUTPUTS

Each output can be individually enabled or disabled via dedicated control bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

OUT1L_ENA

OUT1L enable

0 = disabled

1 = enabled

R104 (68h)

R10 (0Ah)

OUT1R_ENA

OUT1R enable

0 = disabled

1 = enabled

R105 (69h)

R10 (0Ah)

OUT2L_ENA

OUT2L enable

0 = disabled

1 = enabled

R106 (70h)

R10 (0Ah)

OUT2R_ENA

OUT2R enable

0 = disabled

1 = enabled

R107 (71h)

R9 (09h)

OUT3_ENA

OUT3 enable

0 = disabled

1 = enabled

R92 (5Ch)

R9 (09h)

OUT4_ENA

OUT4 enable

0 = disabled

1 = enabled

R93 (5Dh)

Note:

Each bit can be accessed through two separate control registers. Reading from or writing to

either register location has the same effect.

Table 37 Enabling the Analogue Outputs

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