CDB4365 datasheet(39/52 Pages) CIRRUS

39 / 52 page

DS670F1

CS4365

6.7.2

Channel A Volume = Channel B Volume (Px_A=B)

Default = 0

0 - Disabled

1 - Enabled

Function:

The AOUTAx and AOUTBx volume levels are independently controlled by the A and the B Channel Vol-

ume Control Bytes when this function is disabled. The volume on both AOUTAx and AOUTBx are deter-

mined by the A Channel Attenuation and Volume Control Bytes (per A-B pair), and the B Channel Bytes

are ignored when this function is enabled.

6.7.3

Single Volume Control (SNGLVOL)

Default = 0

0 - Disabled

1 - Enabled

Function:

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

Bytes when this function is disabled. The volume on all channels is determined by the A1 Channel Vol-

ume Control Byte, and the other Volume Control Bytes are ignored when this function is enabled.

6.8

Ramp and Mute (address 08h)

6.8.1

Soft Ramp and Zero Cross CONTROL (SZC)

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 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.

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.

432

SZC1

SZC0

RMP_UP

RMP_DN

PAMUTE

DAMUTE

MUTE_P1

MUTE_P0

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