WM8993 datasheet(152/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

152

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R56 (38h)

AntiPOP1

LINEOUT1_DISC

Discharges LINEOUT1P and

LINEOUT1N outputs via approx 4k

resistor

0 = Not active

1 = Actively discharging LINEOUT1P

and LINEOUT1N

LINEOUT2_DISC

Discharges LINEOUT2P and

LINEOUT2N outputs via approx 4k

resistor

0 = Not active

1 = Actively discharging LINEOUT2P

and LINEOUT2N

Table 103 Line Output Discharge Control

VMID REFERENCE DISCHARGE CONTROL

The VMID reference can be actively discharged to AGND through internal resistors. This is desirable

at start-up in order to achieve a known initial condition prior to enabling the soft-start VMID reference;

this ensures maximum suppression of audible pops associated with start-up. VMID is discharged by

setting VMID_DISCH.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R57 (39h)

AntiPOP2

VMID_DISCH

Connects VMID to ground

0 = Disabled

1 = Enabled

Table 104 VMID Reference Discharge Control

INPUT VMID CLAMPS

The analogue inputs can be clamped to Vmid using the INPUTS_CLAMP bit described below. This

allows pre-charging of the input AC coupling capacitors during power-up, avoiding long delays when

using headphone bypass paths. Note that all eight inputs are clamped using the same control bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R21 (15h) Input

Clamps

INPUTS_CLAMP

Input pad VMID clamp

0 = Clamp de-activated

1 = Clamp activated

Table 105 Input VMID Clamps

WM8993 Datasheet(PDF) 152 Page - Wolfson Microelectronics plc

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