WM8993 datasheet(81/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

EARPIECE DRIVER MIXER

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

defined in Table 52. 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.)

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 (1Fh)

HPOUT2

Volume

HPOUT2_MUTE

HPOUT2 (Earpiece Driver) Mute

0 = Un-mute

1 = Mute

HPOUT2_VOL

HPOUT2 (Earpiece Driver) Volume

0 = 0dB

1 = -6dB

R51 (33h)

HPOUT2

Mixer

VRX_TO_HPOUT2

Direct Voice (Differential Input,

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 52 Earpiece Driver Mixer (HPOUT2MIX) Control

LINE OUTPUT MIXERS

The WM8993 provides two pairs of line outputs, both with highly configurable output mixers. The

outputs LINEOUT1N and LINEOUT1P can be configured as two single-ended outputs or as a

differential output. In the same manner, LINEOUT2N and LINEOUT2P can be configured either as

two single-ended outputs or as a differential output. The respective line output mixers can be

configured in single-ended mode or differential mode; each mode supports multiple signal path

configurations.

LINEOUT1 single-ended mode is selected by setting LINEOUT1_MODE = 1. In single-ended mode,

any of three possible signal paths may be enabled:



MIXOUTL (left output mixer) to LINEOUT1P



MIXOUTR (right output mixer) to LINEOUT1N



MIXOUTL (left output mixer) to LINEOUT1N

LINEOUT1 differential mode is selected by setting LINEOUT1_MODE = 0. In differential mode, any

of three possible signal paths may be enabled:



MIXOUTL (left output mixer) to LINEOUT1N and LINEOUT1P



IN1L (input PGA) to LINEOUT1N and LINEOUT1P



IN1R (input PGA) to LINEOUT1N and LINEOUT1P

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