CS42438-DMZR(2006) 查看數據表（PDF） - Cirrus Logic

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CS42438-DMZR
(Rev.:2006)

108 dB, 192 kHz 6-In, 8-Out TDM CODEC

Cirrus Logic 

7.7 Transition Control (Address 06h)

7

DAC_SNGVOL

6

DAC_SZC1

5

DAC_SZC0

4

AMUTE

CS42438

3

2

1

MUTE ADC_SP ADC_SNGVOL ADC_SZC1

0

ADC_SZC0

7.7.1

Single Volume Control (DAC_SNGVOL, ADC_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

AOUT1 and AIN1 Volume Control register and the other Volume Control registers are ignored.

7.7.2

Soft Ramp and Zero Cross Control (ADC_SZC[1:0], DAC_SZC[1:0])

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 volume-level changes will take effect immediately in one step.

Zero Cross

Zero Cross Enable dictates that signal level changes, either by gain changes, attenuation changes or mut-

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

cur 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.

Soft Ramp

Soft Ramp allows level changes, either by gain changes, attenuation changes or muting, to be implement-

ed 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 gain changes, 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 inde-

pendently monitored and implemented for each channel.

46

DS646F1

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