WM8993 datasheet(64/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

The volume ramp rate during soft mute and un-mute is controlled by the DAC_MUTERATE bit.

Ramp rates of fs/32 and fs/2 are selectable as shown in Table 34. The ramp rate determines the rate

at which the volume will be increased or decreased. The actual ramp time depends on the extent of

the difference between the muted and un-muted volume settings.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC CTRL

DAC_MUTERATE

DAC Soft Mute Ramp Rate

0 = Fast ramp (fs/2, maximum

ramp time is 10.7ms at fs=48k)

1 = Slow ramp (fs/32, maximum

ramp time is 171ms at fs=48k)

(Note: ramp rate scales with

sample rate.)

DAC_UNMUTE_RAMP

DAC Unmute Ramp select

0 = Disabling soft-mute

(DAC_MUTE=0) will cause the DAC

volume to change immediately to

DACL_VOL and DACR_VOL

settings

1 = Disabling soft-mute

(DAC_MUTE=0) will cause the DAC

volume to ramp up gradually to the

DACL_VOL and DACR_VOL

settings

DAC_MUTE

DAC Soft Mute Control

0 = DAC Un-mute

1 = DAC Mute

Table 34 DAC Soft-Mute Control

DAC MONO MIX

A DAC digital mono-mix mode can be enabled using the DAC_MONO register bit. The mono mix is

generated as the sum of the Left and Right channel DAC data. To prevent clipping, a -6dB

attenuation is automatically applied to the mono mix.

The mono mix is only supported when one or other DAC is disabled. If DACL_ENA and DACR_ENA

are both set, then stereo operation applies.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

DAC CTRL

DAC_MONO

DAC Mono Mix

0 = Disabled

1 = Enabled

Only valid when one or other

DAC is disabled.

Table 35 DAC Mono Mix

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