WM9093ECSSLASHR datasheet(46/84 Pages) WOLFSON

46 / 84 page

WM9093

Production Data

PD, March 2012, Rev 4.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R21 (15h)

IN3 Line Control

IN3_CLAMP

IN3+ and IN3- input pad VMID clamp

0 = Clamp de-activated

1 = Clamp activated

R22 (16h)

IN1 Line Control

IN1_CLAMP

IN1+ and IN1- input pad VMID clamp

0 = Clamp de-activated

1 = Clamp activated

R23 (17h)

IN2 Line Control

IN2_CLAMP

IN2+ and IN2- input pad VMID clamp

0 = Clamp de-activated

1 = Clamp activated

R57 (39h)

AntiPOP2

VMID_BUF_ENA

VMID Buffer Enable

0 = Disabled

1 = Enabled

Table 23 Input VMID Clamps

HEADPHONE ENABLE/DISABLE

The ground-referenced headphone outputs implement Wolfson’s SilentSwitch™ technology to

minimise pop noise associated with enabling and disabling. The output pins HPL and HPR are

shorted to GND by default while the individual driver stages are enabled. As a final step the short

circuit

then

removed

each

these

paths

setting

the applicable

fields

HPOUT1L_RMV_SHORT and 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 24

and Table 25 describe the recommended sequences for enabling and disabling these output drivers.

SEQUENCE

HEADPHONE ENABLE

Step 1

HPOUT1L_ENA = 1

HPOUT1R_ENA = 1

Step 2

HPOUT1L_DLY = 1

HPOUT1R_DLY = 1

Step 3

DC offset correction

Step 4

HPOUT1L_OUTP = 1

HPOUT1L_RMV_SHORT = 1

HPOUT1R_OUTP = 1

HPOUT1R_RMV_SHORT = 1

Table 24 Headphone Output Enable Sequence

SEQUENCE

HEADPHONE DISABLE

Step 1

HPOUT1L_RMV_SHORT = 0

HPOUT1L_DLY = 0

HPOUT1L_OUTP = 0

HPOUT1R_RMV_SHORT = 0

HPOUT1R_DLY = 0

HPOUT1R_OUTP = 0

Step 2

HPOUT1L_ENA = 0

HPOUT1R_ENA = 0

Table 25 Headphone Output Disable Sequence

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