CS42428 datasheet(51/73 Pages) CIRRUS

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DS605F1

CS42428

6.10

Volume Transition Control (address 0Dh)

6.10.1 SINGLE VOLUME CONTROL (SNGVOL)

Default = 0

Function:

The individual channel volume levels are independently controlled by their respective Volume Control

registers when this function is disabled. When enabled, the volume on all channels is determined by

the A1 Channel Volume Control register and the other Volume Control registers are ignored.

6.10.2 SOFT RAMP AND ZERO CROSS CONTROL (SZCX)

Default = 00

00 - Immediate Change

01 - Zero Cross

10 - Soft Ramp

11 - Soft Ramp on Zero Crossings

Function:

Immediate Change

When Immediate Change is selected, all level changes will take effect immediately in one step.

Zero Cross

Zero Cross Enable dictates that signal-level changes, either by attenuation changes or muting, will

occur on a signal zero crossing to minimize audible artifacts. The requested level-change will occur

after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample

rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-

itored and implemented for each channel.

Soft Ramp

Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally

ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock

periods.

Soft Ramp on Zero Crossing

Soft Ramp and Zero Cross Enable dictates that signal level changes, either by attenuation changes

or muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level

change will occur after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms

at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is

independently monitored and implemented for each channel.

432

Reserved

SNGVOL

SZC1

SZC0

AMUTE

MUTE

ADC_SP

RAMP_UP

RAMP_DN

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