CS4360

DS517PP1

17

4.4.2

Default = 0

Function:

The Digital Volume Control registers allow independent control of the signal levels in 1 dB increments

from 0 to -119 dB. Volume settings are decoded as shown in Table 3. The volume changes are im-

plemented as dictated by the Soft Ramp and Zero Cross bits. All volume settings less than -119 dB

are equivalent to enabling the MUTE bit.

4.5

Mode Control 2 (address 0Dh)

4.5.1

SOFT RAMP AND ZERO CROSS CONTROL (SZC)

Default = 10

00 - Immediate Change

01 - Zero Cross

10 - Soft Ramp

11 - Soft Ramp and Zero Cross

Function:

Immediate Change

When Immediate Change is selected all level changes will be implemented 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 and Zero Cross

Soft Ramp and Zero Cross dictates that signal level changes, either by attenuation changes or mut-

ing, will occur in 1/8 dB steps and will be implemented on successive signal zero crossings. The 1/8

dB level changes will occur after timeout periods between 512 and 1024 sample periods (10.7 ms to

21.3 ms at 48 kHz sample rate) if the signal does not encounter zero crossings. The zero cross func-

tion is independently monitored and implemented for each channel.

Binary Code

Decimal Value

Volume Setting

0001010

0

dB

0010100

-20

-20 dB

0101000

-40

-40 dB

0111100

-60

-60 dB

1011010

-90

-90 dB

Table 3. Example Digital Volume Settings

765

4321

0

SZC1

SZC0

CPEN

PDN

POPG

FREEZE

MCLKDIV

SNGLVOL

100

1100

0