AK4490 Datasheet, PDF (33/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490]
Full Scale (FS) DSD Signal Detection Function
The AK4490 has a full scale (FS) detection function at each channel in DSD Mode. When DSDL or DSDR
input data is continuously “0” (-FS) or “1” (+FS) for 2048 cycles, the AK4490 detects full scale and enters full
scale detection status and DML or DMR bit becomes “1”. The output will be muted by full scale detection if
DDM bit = “1”. When DSDD bit is “0”, the output is attenuated in soft transition. When DSDD bit is “1”, the
soft transition is disabled.
Recovery method to normal operation mode from full scale detection status is controlled by DMC bit when
DDM bit = “1”. When DMC bit = “0”, the AK4490 returns to normal operation automatically by a normal
signal input. When DMC bit = “1”, the AK4490 returns normal operation by writing DMRE bit = “1”.
DSDD
Mode
Status After Detection
0
Normal Path
DSD Mute
(default)
1
Volume Bypass
PD
Table 19. DSD Mode and the Device Status after Detection (DDM bit= “0”)
DSD Error
(DDR or DDLbit)
2048fs
DSD Data
DSD Data
DSD Data(FS or -FS )
DSD Data
AOUT
Mode
Figure 9. Analog Output Waveform on DSD FS Detection (DSDD bit= “1”)
DSD Error
(DDR or DDLbit)
2048fs
DSD Data
DSD Data
DSD Data(FS or -FS )
AOUT
Mode
DSD Data
Figure 10. Analog Output Waveform on DSD FS Detection (DSDD bit= “0”)
MS1648-E-03
- 33 -
2014/11