CS42324 Datasheet, PDF (55/71 Pages) Cirrus Logic – 10-In, 6-Out, 2 Vrms Audio CODEC

6.11 DAC2 Control (Address 0Ch)
7
DAC2_DEPH
6
DAC2_
SNGVOL
5
DAC2_SOFT
4
DAC2_ZC
3
DAC2_
LOOP_BACK
2
DAC2_INV
CS42324
1
0
DAC2_MIX1 DAC2_MIX0
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.
DAC2_DEPH
0
1
Off
On (valid for Fs = 44.1 kHz)
DAC2 De-Emphasis Control
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.
DAC2_SNGVOL
0
Off
1
On
DAC2 Single Volume Control
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.
DAC2_SOFT
0
Off
1
On
DAC2 Soft Ramp Control
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.
DAC2_SOFT
0
0
0
1
1
0
1
1
DAC2_ZC
Mode
Changes to affect immediately
Zero Cross enabled
Soft Ramp enabled
Soft Ramp and Zero Cross enabled
DS721A6
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