AK4458VN Datasheet, PDF (44/83 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 8ch Premium DAC

[AK4458]
■ 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 Filter
Table 16. Digital Filter Setting (*: Do not 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/DEM41-40 bits (DEM bits).
DEM11-10/DEM21-20/DEM31-30/DEM41-40 bits control de-emphasis mode of DAC1/2/3/4, respectively.
This mode is only valid in PCM Normal Speed Mode.
DEM11/ DEM10/
DEM21/ DEM20/
DEM31/ DEM30/
Mode
DEM41 DEM40
0
0
44.1kHz
0
1
OFF (default)
1
0
48kHz
1
1
32kHz
Table 17. DAC1/2/3/4 De-emphasis Control
014011794-E-00
- 44 -
2015/01