WM8994ECSSLASHR datasheet(129/363 Pages) CIRRUS

129 / 363 page

WM8994

Rev 4.6

129

SPEAKER BOOST MIXER

Each class D/AB speaker driver has its own boost mixer which performs a dual role. It allows the

output from the left speaker mixer (via SPKLVOL), right speaker mixer (via SPKRVOL)

, or the ‘Direct

Voice’ path to be routed to either speaker driver. The speaker boost mixers are controlled using the

registers defined in Table 66 below.

The ‘Direct Voice’ path is the differential input, VRXN-VRXP, routed directly to the output drivers,

providing a low power differential path from baseband voice to loudspeakers. Note that a phase

inversion exists b

etween VRXP and SPKOUTxP. The ‘Direct Voice’ path output therefore represents

VVRXN - VVRXP.

The second function of the speaker boost mixers is that they provide an additional AC gain (boost)

function to shift signal levels between the AVDD1 and SPKVDD voltage domains for maximum output

power. The AC gain (boost) function is described in the

“Analogue Outputs” section.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R36 (0024h)

SPKOUT

Mixers

IN2LRP_TO_SPKOUT

Direct Voice (VRXN-VRXP) to Left

Speaker Mute

0 = Mute

1 = Un-mute

SPKMIXL_TO_SPKOU

SPKMIXL Left Speaker Mixer to

Left Speaker Mute

0 = Mute

1 = Un-mute

SPKMIXR_TO_SPKO

UTL

SPKMIXR Right Speaker Mixer to

Left Speaker Mute

0 = Mute

1 = Un-mute

IN2LRP_TO_SPKOUT

Direct Voice (VRXN-VRXP) to Right

Speaker Mute

0 = Mute

1 = Un-mute

SPKMIXL_TO_SPKOU

SPKMIXL Left Speaker Mixer to

Right Speaker Mute

0 = Mute

1 = Un-mute

SPKMIXR_TO_SPKO

UTR

SPKMIXR Right Speaker Mixer to

Right Speaker Mute

0 = Mute

1 = Un-mute

Table 66 Speaker Boost Mixer (SPKOUTLBOOST, SPKOUTRBOOST) Control

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