WM8993 datasheet(68/229 Pages) WOLFSON

68 / 229 page

WM8993

Production Data

PD, November 2010, Rev 4.0

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

SPKLVOL_ENA

SPKMIXL Mixer and SPKLVOL

PGA Enable

0 = Disabled

1 = Enabled

Note that SPKMIXL and SPKLVOL

are also enabled when

SPKOUTL_ENA is set.

MIXOUTLVOL_ENA

MIXOUTL Left Volume Control

Enable

0 = Disabled

1 = Enabled

MIXOUTRVOL_ENA

MIXOUTR Right Volume Control

Enable

0 = Disabled

1 = Enabled

MIXOUTL_ENA

MIXOUTL Left Output Mixer Enable

0 = Disabled

1 = Enabled

MIXOUTR_ENA

MIXOUTR Right Output Mixer

Enable

0 = Disabled

1 = Enabled

R56 (38h)

AntiPOP1

HPOUT2_IN_ENA

HPOUT2MIX Mixer and Input Stage

Enable

0 = Disabled

1 = Enabled

Table 38 Output Signal Paths Enable

HEADPHONE SIGNAL PATHS ENABLE

The HPOUT1L and HPOUT1R output paths can be actively discharged to AGND through internal

resistors if desired. This is desirable at start-up in order to achieve a known output stage condition

prior to enabling the VMID reference voltage. This is also desirable in shutdown to prevent the

external connections from being affected by the internal circuits. The HPOUT1L and HPOUT1R

outputs are shorted to AGND by default; the short circuit is removed on each of these paths by

setting the applicable fields HPOUT1L_RMV_SHORT or HPOUT1R_RMV_SHORT.

The ground-referenced Headphone output drivers are designed to suppress pops and clicks when

enabled or disabled. However, it is necessary to control the drivers in accordance with a defined

sequence in start-up and shut-down to achieve the pop suppression. It is also necessary to schedule

the DC Servo offset correction at the appropriate point in the sequence (see “DC Servo”). Table 39

and Table 40 describe the recommended sequences for enabling and disabling these output drivers.

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