WM8994ECSSLASHR datasheet(130/363 Pages) CIRRUS

130 / 363 page

WM8994

130

Rev 4.6

EARPIECE DRIVER MIXER

The earpiece driver has a dedicated mixer, HPOUT2MIX, which is controlled using the registers

defined in Table 67. The earpiece driver is configurable to select output from the left output mixer (via

MIXOUTLVOL), the right output mixer (via MIXOUTRVOL), or

the ‘Direct Voice’ path.

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 earpiece. Note that a phase inversion

exists between VRXP and HPOUT2P. The ‘Direct Voice’ path output therefore represents V

VRXN -

VVRXP.

Care should be taken to avoid clipping when enabling more than one path to the earpiece driver. The

HPOUT2VOL volume control can be used to avoid clipping when more than one full scale signal is

input to the mixer.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R31 (001Fh)

HPOUT2

Volume

HPOUT2_MUTE

HPOUT2 (Earpiece Driver) Mute

0 = Un-mute

1 = Mute

HPOUT2_VOL

HPOUT2 (Earpiece Driver) Volume

0 = 0dB

1 = -6dB

R51 (0033h)

HPOUT2

Mixer

IN2LRP_TO_HPOUT2

Direct Voice (VRXN-VRXP) to

Earpiece Driver

0 = Mute

1 = Un-mute

MIXOUTLVOL_TO_HP

OUT2

MIXOUTLVOL (Left Output Mixer

PGA) to Earpiece Driver

0 = Mute

1 = Un-mute

MIXOUTRVOL_TO_HP

OUT2

MIXOUTRVOL (Right Output Mixer

PGA) to Earpiece Driver

0 = Mute

1 = Un-mute

Table 67 Earpiece Driver Mixer (HPOUT2MIX) Control

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