WM8980CGEFLSLASHV datasheet(64/123 Pages) WOLFSON

64 / 123 page

WM8980

Pre-Production

PP, Rev 3.8, May 2012

OUT3 can provide a buffered midrail headphone pseudo-ground, or a left line output.

OUT4 can provide a buffered midrail headphone pseudo-ground, a right line output, or a mono mix

output.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R56

OUT3 mixer

control

OUT3MUTE

0 = Output stage outputs OUT3 mixer

1 = Output stage muted – drives out

VMID. Can be used as VMID buffer in

this mode.

OUT4_2OUT3

OUT4 mixer output to OUT3

0 = disabled

1= enabled

BYPL2OUT3

Left ADC input to OUT3

0 = disabled

1= enabled

LMIX2OUT3

Left DAC mixer to OUT3

0 = disabled

1= enabled

LDAC2OUT3

Left DAC output to OUT3

0 = disabled

1= enabled

R57

OUT4 mixer

control

OUT4MUTE

0 = Output stage outputs OUT4 mixer

1 = Output stage muted – drives out

VMID. Can be used as VMID buffer in

this mode.

HALFSIG

0=OUT4 normal output

1=OUT4 attenuated by 6dB

LMIX2OUT4

Left DAC mixer to OUT4

0 = disabled

1= enabled

LDAC2OUT4

Left DAC to OUT4

0 = disabled

1= enabled

BYPR2OUT4

Right ADC input to OUT4

0 = disabled

1= enabled

RMIX2OUT4

Right DAC mixer to OUT4

0 = disabled

1= enabled

RDAC2OUT4

Right DAC output to OUT4

0 = disabled

1= enabled

Table 46 OUT3/OUT4 Mixer Registers

The OUT3 and OUT4 output stages each have a selectable gain boost of 1.5x (3.52dB). When this

boost is enabled the output DC level is also level shifted (from AVDD/2 to 1.5xAVDD/2) to prevent

the signal from clipping. A dedicated amplifier BUFDCOP, as shown in Figure 32, is used to perform

the DC level shift operation. This buffer must be enabled using the BUFDCOPEN register bit for this

operating mode. It should also be noted that if SPKVDD is not equal to or greater than 1.5xAVDD this

boost mode may result in signals clipping. Table 43 summarises the effect of the OUT3BOOST and

OUT4BOOST control bits.

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