WM1811A datasheet(115/328 Pages) WOLFSON

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Production Data

WM1811A

PD, November 2013, Rev 4.1

115

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

MIXOUTLVOL_TO_

HPOUT2

MIXOUTLVOL (Left Output Mixer

PGA) to Earpiece Driver

0 = Mute

1 = Un-mute

MIXOUTRVOL_TO_

HPOUT2

MIXOUTRVOL (Right Output Mixer

PGA) to Earpiece Driver

0 = Mute

1 = Un-mute

Table 66 Earpiece Driver Mixer (HPOUT2MIX) Control

LINE OUTPUT MIXERS

The WM1811A provides two pairsof 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 LINEOUT1Nand LINEOUT1P



IN1R (input PGA) to LINEOUT1Nand LINEOUT1P

The LINEOUT1output mixers are controlled as described in Table 67. Care should be taken to avoid

clipping when enabling more than one path to the line outputmixers. The LINEOUT1_VOL control can

be used to provide -6dB attenuation when more than one full scale signal is applied.

When using the LINEOUT1 mixers in single-ended mode, a buffered VMID must be enabled. This is

achieved by setting LINEOUT_VMID_BUF_ENA, as described in the “Analogue Outputs” section.

WM1811A Datasheet(PDF) 115 Page - Wolfson Microelectronics plc

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