WM8750 datasheet(32/60 Pages) WOLFSON

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WM8750BL

Production Data

PD, Rev 4.1, August 2012

ANALOGUE OUTPUTS

LOUT1/ROUT1 OUTPUTS

The LOUT1 and ROUT1 pins can drive a 16

 or 32 headphone or a line output (see Headphone

Output and Line Output sections, respectively). The signal volume on LOUT1 and ROUT1 can be

independently adjusted under software control by writing to LOUT1VOL and ROUT1VOL,

respectively. Note that gains over 0dB may cause clipping if the signal is large. Any gain setting below

0101111 (minimum) mutes the output driver. The corresponding output pin remains at the same DC

level (the reference voltage on the VREF pin), so that no click noise is produced when muting or un-

muting.

A zero cross detect on the analogue output may also be enabled when changing the gain setting to

minimize audible clicks and zipper noise as the gain updates. If zero cross is enabled a timeout is

also available to update the gain if a zero cross does not occur. This function may be enabled by

setting TOEN in register R23 (17h).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R2 (02h)

LOUT1

Volume

LO1VU

Left Volume Update

0 = Store LOUT1VOL in intermediate

latch (no gain change)

1 = Update left and right channel gains

(left = LOUT1VOL, right = intermediate

latch)

LO1ZC

Left zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

6:0

LOUT1VOL

[6:0]

1111001

(0dB)

LOUT1 Volume

1111111 = +6dB

… (80 steps)

0110000 = -67dB

0101111 to 0000000 = Analogue

MUTE

R3 (03h)

ROUT1

Volume

RO1VU

Right Volume Update

0 = Store ROUT1VOL in intermediate

latch (no gain change)

1 = Update left and right channel gains

(left = intermediate latch, right =

ROUT1VOL)

RO1ZC

Right zero cross enable

1 = Change gain on zero cross only

0 = Change gain immediately

6:0

ROUT1VOL

[6:0]

1111001

ROUT1 Volume

Similar to LOUT1VOL

Table 25 LOUT1/ROUT1 Volume Control

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