WM1811A datasheet(128/328 Pages) WOLFSON

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WM1811A

Production Data

PD, November 2013, Rev 4.1

128

EARPIECE DRIVER OUTPUT CONFIGURATIONS

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

which takes its inputs from the mixer output PGAs MIXOUTLVOL and MIXOUTRVOL. Fine volume

control is available using MIXOUTLVOL and MIXOUTRVOL. A selectable -6dB attenuation is

available on the HPOUT2MIX output, as described in Table 66 (refer to the “Analogue Output Signal

Path” section).

The earpiece outputs are designed to operate in a BTL configuration, driving 50mW into a typical 16



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

s before HPOUT2_ENA.

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

“Analogue 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

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 74.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R56 (0038h)

AntiPOP (1)

LINEOUT_VMID_BUF_

ENA

Enables VMID reference for line

outputs in single-ended mode

0 = Disabled

1 = Enabled

Table 74 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 fromMic/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

WM1811A Datasheet(PDF) 128 Page - Wolfson Microelectronics plc

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