AK4456 Datasheet, PDF (44/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz Advanced 32-bit DAC

[AK4456]
■ Digital Filter (PCM mode)
Four digital filters are available for playback, providing a choice of different sound colors. These digital filters
are selected by SD bit, SLOW bit and SSLOW bit.
SSLOW
0
0
0
0
1
SD bit SLOW bit
Mode
0
0
Sharp roll-off filter
0
1
Slow roll-off filter
1
0
Short delay Sharp roll-off filter
1
1
Short delay Slow roll-off filter
*
*
Super Slow Roll-off Mode
Table 15. Digital Filter Setting (*: don’t care)
(default)
The slowest frequency characteristics setting is when SSLOW bit = “1”.
■ De-emphasis Filter (PCM mode)
A digital de-emphasis filter is available for 32kHz, 44.1kHz or 48kHz sampling rates (tc = 50/15µs) and is
enabled or disabled with DEM11-10/DEM21-20/DEM31-30 bits (DEM bits).
DEM11-10/DEM21-20/DEM31-30 bits control de-emphasis mode of DAC1/2/3, respectively. D The slowest
frequency characteristics setting is when SSLOW bit = “1”.
DEM11/ DEM10/
DEM21/ DEM20/ Mode
DEM31/ DEM30/
0
0
44.1kHz
0
1
OFF (default)
1
0
48kHz
1
1
32kHz
Table 16. De-emphasis Control
015006886-E-00
- 44 -
2015/06