WM8994ECSSLASHR datasheet(111/363 Pages) CIRRUS

111 / 363 page

WM8994

Rev 4.6

111

The DAC Soft Mute register controls are defined in Table 52.

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. The ramp rate determines the rate at which the volume will be

increased or decreased. Note that the actual ramp time depends on the extent of the difference

between the muted and un-muted volume settings.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1556 (0614h)

DAC Softmute

DAC_SOFT

MUTEMODE

DAC Unmute Ramp select

0 = Disabling soft-mute

(DAC[1/2][L/R]_MUTE=0) will cause

the DAC volume to change

immediately to DAC[1/2][L/R]_VOL

settings

1 = Disabling soft-mute

(DAC[1/2][L/R]_MUTE=0) will cause

the DAC volume to ramp up gradually

to the DAC[1/2][L/R]_VOL settings

DAC_MUTE

RATE

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.)

Table 52 DAC Soft-Mute Control

WM8994ECS/R 数据表(PDF) 111 Page - Cirrus Logic

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