AK4620A Datasheet, PDF (22/42 Pages) Asahi Kasei Microsystems – 24 BIT 192KHZ AUDIO CODEC WITH IPGA

ASAHI KASEI
[AK4620A]
2. DSD Mode
In DSD mode, DIF0-2 is ignored. The frequency of DCLK is fixed at 64fs. The DCKB bit inverts the polarity of DCLK.
DCLK (64fs)
DCKB=1
DCLK (64fs)
DCKB=0
DSDL,DSDR
D0
D1
Normal
D2
D3
DSDL,DSDR
Phase Modulation ^D0
D1
D1
D2
D2
D3
Figure 7. DSD Mode Timing
„ D/A conversion mode switching timing
RSTDA bit
D/A Mode
D/A Data
PCM Mode
PCM Data
≥4/fs
DSD Mode
≥0
DSD Data
Figure 8. D/A Mode Switching Timing (PCM to DSD)
RSTDA bit
D/A Mode
D/A Data
DSD Mode
≥4/fs
DSD Data
PCM Mode
PCM Data
Figure 9. D/A Mode Switching Mode Timing (DSD to PCM)
Caution: In DSD mode, the signal level ranges from 25% to 75%. Peak levels of DSD signal above this range are not
recommended by the SACD format book (Scarlet Book).
MS0368-E-00
- 22 -
2004/12