CS42324 datasheet(55/71 Pages) CIRRUS

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DS721A6

CS42324

6.11

DAC2 Control (Address 0Ch)

6.11.1

DAC2 De-Emphasis Control

This bit enables the digital filter to apply the standard 15μs/50μs digital de-emphasis filter response for a

sample rate (Fs) of 44.1 kHz. De-emphasis is available only in Single-Speed Mode.

6.11.2

DAC2 Single Volume Control

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 DAC2 channels is determined by the

DAC2A Volume Control register and the DAC2B Volume Control register is ignored.

6.11.3

DAC2 Soft Ramp Control

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.

6.11.4

DAC2 Zero Cross Control

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 time-

out 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 and Zero Cross Enable

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

ing, 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 time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sam-

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

itored and implemented for each channel.

432

DAC2_DEPH

DAC2_

SNGVOL

DAC2_SOFT

DAC2_ZC

DAC2_

LOOP_BACK

DAC2_INV

DAC2_MIX1

DAC2_MIX0

DAC2_DEPH

DAC2 De-Emphasis Control

Off

On (valid for Fs = 44.1 kHz)

DAC2_SNGVOL

DAC2 Single Volume Control

Off

1On

DAC2_SOFT

DAC2 Soft Ramp Control

0Off

DAC2_SOFT

DAC2_ZC

Mode

Changes to affect immediately

Zero Cross enabled

Soft Ramp enabled

Soft Ramp and Zero Cross enabled

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