CS44800 datasheet(55/80 Pages) CIRRUS

55 / 80 page

DS632F1

CS44800

7.7

Volume Control Configuration (address 06h)

7.7.1

Single Volume Control (SNGVOL)

Default = 0

Function:

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

isters when this function is disabled. When enabled, the volume on all channels is determined by the A1

Channel Volume Control register. The other Volume Control registers are ignored.

7.7.2

Soft Ramp and Zero Cross Control (SZC[1:0])

Default = 10

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 tim-

eout period (approximately 18.7 ms for a PWM switch rate of 384/768 kHz and 17.0 ms for a PWM switch

rate of 421.875/843.75 kHz) if the signal does not encounter a zero crossing. The zero cross function is

independently monitored and implemented for each channel.

Soft Ramp

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

ing, 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 (approximately 18.7 ms for a PWM switch rate of 384/768 kHz and

17.0 ms for a PWM switch rate of 421.875/843.75 kHz) if the signal does not encounter a zero crossing.

The zero cross function is independently monitored and implemented for each channel.

7.7.3

Enable 50% Duty Cycle for Mute Condition (MUTE_50/50)

Default = 0

0 - Disabled

1 - Enabled

Function:

This bit enables the modulator to output an exact 50%-duty-cycle PWM signal (not modulated), which cor-

responds to digital silence, for all mute conditions. The muting function is affected, similar to volume con-

765

SNGVOL

SZC1

SZC0

RESERVED

MUTE_50/50

SRD_ERR

SRU_ERR

AMUTE

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