WM8993 datasheet(95/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

EARPIECE DRIVER OUTPUT CONFIGURATIONS

The earpiece driver outputs HPOUT2P and HPOUT2N are driven by the HPOUT2MIX output mixer,

which can take inputs from the mixer output PGAs MIXOUTLVOL and MIXOUTRVOL, or from the

low power, differential Direct Voice path IN2LP/VRXN and IN2RP/VRXP. Fine volume control is

available on the output mixer paths using MIXOUTLVOL and MIXOUTRVOL. A selectable -6dB

attenuation is available on the HPOUT2MIX output, as described in Table 52 (refer to the “Output

Signal Path” section).

The earpiece outputs are designed to operate in a BTL configuration, driving 50mW into a typical

Ω ear speaker.

For suppression of pop noise there are two separate enables for the earpiece driver; HPOUT2_ENA

enables the output stage and HPOUT2_IN_ENA enables the mixer and input stage.

HPOUT2_IN_ENA should be enabled a minimum of 50

μs before HPOUT2_ENA – see “Control Write

Sequencer” section for an example power sequence.

LINE OUTPUT CONFIGURATIONS

The four line outputs LINEOUT1P, LINEOUT1N, LINEOUT2P and LINEOUT2N provide a highly

flexible combination of differential and single-ended configurations, each driven by a dedicated output

mixer. There is a selectable -6dB gain option in each mixer to avoid clipping when mixing more than

one signal into a line output. Additional volume control is available at other locations within each of

the supported signal paths. For more information about the line output mixing options, refer to the

“Output Signal Path” section.

Typical applications for the line outputs (single-ended or differential) are:

•

Handset or headset microphone output to external voice CODEC

•

Stereo line output

•

Output to external speaker driver(s) to support additional loudspeakers (e.g. stereo 2W

with external driver plus on-chip mono 2W output)

When single-ended mode is selected for either LINEOUT1 or LINEOUT2, a buffered VMID must be

enabled as a reference for the outputs. This is enabled by setting the LINEOUT_VMID_BUF_ENA bit

as defined in Table 62.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R56 (38h)

AntiPOP1

LINEOUT_VMID_BUF_E

Enables VMID reference for line

outputs in single-ended mode

0 = Disabled

1 = Enabled

Table 62 LINEOUT VMID Buffer for Single-Ended Operation

Some example line output configurations are listed and illustrated below.



Differential line output from Mic/Line input on IN1L PGA



Differential line output from Mic/Line input on IN1R PGA



Stereo differential line output from output mixers MIXOUTL and MIXOUTR



Stereo single-ended line output from output mixer to either LINEOUT1 or LINEOUT2



Mono single-ended line output from output mixer

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