WM8993 datasheet(80/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

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 ‘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.) The speaker boost mixers are controlled using the registers

defined in Table 51 below.

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 (24h)

SPKOUT

Mixers

VRX_TO_SPKOUTL

Direct Voice (Differential Input,

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

VRX_TO_SPKOUTR

Direct Voice (Differential Input,

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 51 Speaker Boost Mixer (SPKOUTLBOOST, SPKOUTRBOOST) Control

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