AK4458 Datasheet, PDF (55/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 8ch Premium DAC

[AK4458]
■ DSD Full Scale (FS) Signal Detection Function
The AK4458 has a full scale signal detection function for each channel in DSD mode. When the input data of
each channel (DSDL1/2/3/4, DSDR1/2/3/4) is continuously “0” (-FS) or “1” (+FS) for 2048 cycles, the
AK4458 detects a full scale signal and outputs “1” on the DML1/2/3/4 and DMR1/2/3/4 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 AK4458 will return to normal operation automatically by inputting a normal signal.
When DMC bit = “1”, the AK4458 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 Bypass
PD
Table 27. 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”)
014011794-E-01
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2015/08