WM8750 datasheet(33/60 Pages) WOLFSON

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Production Data

WM8750BL

PD, Rev 4.1, August 2012

LOUT2/ROUT2 OUTPUTS

The LOUT2 and ROUT2 output pins are essentially similar to LOUT1 and ROUT1, but they are

independently controlled and can also drive an 8

 mono speaker (see Speaker Output section). For

speaker drive, the ROUT2 signal must be inverted (ROUT2INV = 1), so that the left and right channel

are mixed to mono in the speaker [L–(-R) = L+R].

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R40 (28h)

LOUT2

Volume

6:0

LOUT2VOL

[6:0]

1111001

(0dB)

Similar to LOUT1VOL

LO2ZC

Left zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

LO2VU

Same as LO1VU

R41 (29h)

ROUT2

Volume

6:0

ROUT2VOL

[6:0]

1111001

(0dB)

Similar ROUT1VOL

RO2ZC

Right zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

RO2VU

Same as RO1VU

R24 (18h)

Additional

Control (2)

ROUT2INV

ROUT2 Invert

0 = No Inversion (0

 phase shift)

1 = Signal inverted (180

 phase shift)

Table 26 LOUT2/ROUT2 Volume Control

MONO OUTPUT

The MONOOUT pin can drive a mono line output. The signal volume on MONOOUT can be adjusted

under software control by writing to MONOOUTVOL.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R42 (2Ah)

MONOOUT

Volume

6:0

MONOOUT

VOL [6:0]

1111001

(0dB)

MONOOUT Volume

1111111 = +6dB

… (80 steps)

0110000 = -67dB

0101111 to 0000000 = Analogue MUTE

MOZC

MONOOUT zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

Table 27 MONOOUT Volume Control

OUT3 OUTPUT

The OUT3 pin can drive a 16

 or 32 headphone or a line output or be used as a DC reference for a

headphone output (see Headphone Output section). It can be selected to either drive out an inverted

ROUT1 or inverted MONOOUT for e.g. an earpiece drive between OUT3 and LOUT1 or differential

output between OUT3 and MONOOUT. OUT3 can also drive an un-inverted ROUT1 signal, which

originates at the right mixer output before the output PGA.

OUT3SW selects the mode of operation required.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R24 (18h)

Additional

Control (2)

8:7

OUT3SW

[1:0]

OUT3 select

00 : VREF

01 : ROUT1 signal (volume controlled by

ROUT1VOL)

10 : MONOOUT

11 : right mixer output (no volume

control through ROUT1VOL)

Table 28 OUT3 Select

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