WM8962B datasheet(116/295 Pages) WOLFSON

116 / 295 page

WM8962

116

Rev 4.3

SPEAKER OUTPUT PATHS

The following sections describe all the speaker output paths and controls. For information on the

headphone output paths and controls, refer to the “Headphone Output Paths” section.

SPEAKER MIXER CONTROL

The two speaker mixers - SPKMIXL and SPKMIXR

– can each have any combination of the six

available input paths enabled as described in Table 70 (left speaker mixer) and Table 71 (right

speaker mixer). The six input signal paths are two from the DACs (DACL and DACR), two from the

input mixers (MIXINL and MIXINR) and two bypass paths direct from the IN4 input pins (IN4L and

IN4R). The speaker mixers are muted by default.

The two signal paths from the left and right DACs to each of the two speaker mixers SPKMIXL and

SPKMIXR are enabled using the register bits DACL_TO_SPKMIXL, DACL_TO_SPKMIXR,

DACR_TO_SPKMIXL and DACR_TO_SPKMIXR. A selectable -6dB control is available on each of

these paths to help avoid signal clipping.

The two DAC output signals can also be configured to bypass the speaker mixers using the

SPKMIXL_TO_SPKOUTL_PGA and SPKMIXR_TO_SPKOUTR_PGA register bits. Note that the DAC

output signals bypass the mixers by default.

The direct signal paths from each of the input mixers MIXINL and MIXINR to each of the speaker

mixers

SPKMIXL

and

SPKMIXR

are

enabled

using

the

MIXINL_TO_SPKMIXL,

MIXINL_TO_SPKMIXR,

MIXINR_TO_SPKMIXL

and

MIXINR_TO_SPKMIXR

bits.

selectable -6dB control is available on each of these paths to help avoid signal clipping.

The direct signal paths from the IN4L and IN4R input pins to the speaker mixers SPKMIXL and

SPKMIXR are enabled using the IN4L_TO_SPKMIXL, IN4L_TO_SPKMIXR, IN4R_TO_SPKMIXL, and

IN4R_TO_SPKMIXR register bits. Each input signal path from IN4 also has an associated PGA with a

gain range from -15dB to +6dB.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R105 (69h)

Speaker Mixer

(1)

SPKMIXL_TO_SP

KOUTL_PGA

Left Speaker PGA Path Select

0 = DACL Output

1 = SPKMIXL Output

DACL_TO_SPKM

IXL

Left DAC to Left Speaker Mixer

select

0 = Disabled

1 = Enabled

DACR_TO_SPKM

IXL

Right DAC to Left Speaker Mixer

select

0 = Disabled

1 = Enabled

MIXINL_TO_SPK

MIXL

Left Input Mixer to Left Speaker

Mixer select

0 = Disabled

1 = Enabled

MIXINR_TO_SPK

MIXL

Right Input Mixer to Left Speaker

Mixer select

0 = Disabled

1 = Enabled

IN4L_TO_SPKMI

Input IN4L to Left Speaker Mixer

select

0 = Disabled

1 = Enabled

IN4R_TO_SPKMI

Input IN4R to Left Speaker Mixer

select

0 = Disabled

1 = Enabled

WM8962B Datasheet(PDF) 116 Page - Wolfson Microelectronics plc

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