AK4396 Datasheet, PDF (23/38 Pages) Asahi Kasei Microsystems – Advanced Multi-Bit 192kHz 24-Bit ΔΣ DAC

ASAHI KASEI
„ D/A conversion mode switching timing
[AK4396]
RSTN bit
D/A Mode
D/A Data
≥4/fs
PCM Mode
DSD Mode
≥0
PCM Data
DSD Data
Figure 6. D/A Mode Switching Timing (PCM to DSD)
RSTN bit
D/A Mode
D/A Data
DSD Mode
≥4/fs
DSD Data
Figure 7. D/A Mode Switching Timing (DSD to PCM)
PCM Mode
PCM Data
Caution: In DSD mode, the signal level is ranging from 25% to 75%. Peak levels of DSD signal above this duty are not
recommended by SACD format book (Scarlet Book).
„ De-emphasis Filter
A digital de-emphasis filter is available for 32kHz, 44.1kHz or 48kHz sampling rates (tc = 50/15µs) and is enabled or
disabled with DEM1-0 pins or DEM1-0 bits. In case of double speed and quad speed mode, the digital de-emphasis filter
is always off. When DSD mode, DEM1-0 bits are ignored. The setting value is held even if PCM mode and DSD mode
are switched.
DEM1 DEM0
Mode
0
0
44.1kHz
0
1
OFF Default
1
0
48kHz
1
1
32kHz
Table 12. De-emphasis Control (Normal Speed Mode)
„ Output Volume
The AK4396 includes channel independent digital output volumes (ATT) with 256 levels at linear step including MUTE.
These volumes are in front of the DAC and can attenuate the input data from 0dB to –48dB and mute. When changing
levels, transitions are executed via soft changes; thus no switching noise occurs during these transitions. The transition
time of 1 level and all 256 levels is shown in Table 13.
Sampling Speed
Transition Time
1 Level
255 to 0
Normal Speed Mode
4LRCK
1020LRCK
Double Speed Mode
8LRCK
2040LRCK
Quad Speed Mode
16LRCK
4080LRCK
Table 13. ATT Transition Time
MS0336-E-00
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2004/08