AK4456 Datasheet, PDF (55/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz Advanced 32-bit DAC

[AK4456]
■ DSD Full Scale (FS) Signal Detection Function
The AK4456 has a full scale signal detection function for each channel in DSD mode. When the input data of
each channel (DSDL1/2/3, DSDR1/2/3) is continuously “0” (-FS) or “1” (+FS) for 2048 cycles, the AK4456
detects a full scale signal and outputs “1” on the DML1/2/3 and DMR1/2/3 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 AK4456 will return to normal operation automatically by inputting a normal signal.
When DMC bit = “1”, the AK4456 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 25. 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 55. 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 56. Analog Output Waveform when DSD FS is Detected (DSDD bit= “0”)
015006886-E-00
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2015/06