AK4452VN Datasheet, PDF (59/91 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 2ch Premium DAC

[AK4452]
■ DSD Full Scale (FS) Signal Detection Function
The AK4452 has a full scale signal detection function for each channel in DSD mode. When the input data of
each channel (DSDL1, DSDR1) is continuously “0” (-FS) or “1” (+FS) for 2048 cycles, the AK4452 detects a
full scale signal and outputs “1” on the DML1 and DMR1 bits. The output data is muted if a full scale signal is
detected. When DSDD bit = “0”, the output data is changed in soft transition, and the output data is changed
without soft transition when DSDD bit = “1”. A recovering condition to normal operation mode from full scale
detection status is selected by DMC bit if DDM bit = “1”.
When DMC bit = “0”, the AK4452 will return to normal operation automatically by inputting a normal signal.
When DMC bit = “1”, the AK4452 will return to normal operation mode by writing “1” to DMRE bit.
DSDD bit
Mode
Status after Detection
0
Normal path
DSD Mute
(default)
1
Volume pass
PD
Table 24. DSD Mode and The Device Status after Full Scale Detection (DDM bit= “0”)
DSD Error
(DDR or DDLbit)
2048fs
DSD Data
DSD Data
DSD Data(FS or -FS )
AOUT
DSD Data
Figure 58. Analog Output Waveform when DSD FS is Detected (DSDD bit= “1”)
DSD Error
(DDR or DDLbit)
2048fs
DSD Data
DSD Data
DSD Data(FS or -FS )
AOUT
DSD Data
Figure 59. Analog Output Waveform when DSD FS is Detected (DSDD bit= “0”)
Rev. 0.1
- 59 -
2014/04