AK4392 Datasheet, PDF (24/41 Pages) Asahi Kasei Microsystems – High Performance 120dB Premium 32-Bit DAC

■ D/A Conversion Mode Switching Timing
[AK4392]
RSTN bit
D/A Mode
D/A Data
≥4/fs
PCM Mode
DSD Mode
≥0
PCM Data
DSD Data
Figure 10. D/A Mode Switching Timing (PCM to DSD)
RSTN bit
D/A Mode
D/A Data
DSD Mode
PCM Mode
≥4/fs
DSD Data
PCM Data
Figure 11. D/A Mode Switching Timing (DSD to PCM)
Note. The signal range is identified as 25% ~ 75% duty ratios in DSD mode. DSD signal must not go beyond this duty
range at the 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 256fs/384fs and 128fs/192fs, 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 10. De-emphasis Control
■ Output Volume
The AK4392 includes channel independent digital output volumes (ATT) with 255 levels at linear step including MUTE.
These volume control is in front of the DAC and it can attenuate the input data from 0dB to –127dB and mute. When
changing output levels, transitions are executed in soft change; thus no switching noise occurs during these transitions.
MS1045-E-02
- 24 -
2009/04