AK4390 Datasheet, PDF (17/32 Pages) Asahi Kasei Microsystems – Ultra Low Latency 32-Bit ΔΣ DAC

[AK4390]
■ De-emphasis Filter
A digital de-emphasis filter is available for 32kHz, 44.1kHz or 48kHz sampling rates (tc = 50/15µs) and it is enabled or
disabled with the DEM1-0 pins or DEM1-0 bits. For 256fs/384fs and 128fs/192fs, the digital de-emphasis filter is always
off. When in DSD mode, the DEM1-0 bits are ignored. The current value is held even if PCM mode and DSD mode are
switched.
DEM1 DEM0
Mode
0
0
44.1kHz
0
1
OFF (default)
1
0
48kHz
1
1
32kHz
Table 5. De-emphasis Control
■ Output Volume Control
The AK4390 includes channel independent digital output volume control (ATT) with 256 levels at 0.5dB steps including
MUTE. The volume control is in front of the DAC, and it can attenuate the input data from 0dB to –127dB and mute.
When changing output levels, transitions are executed via soft changes; thus no switching noise occurs during these
transitions.
MS1046-E-00
- 17 -
2009/01