AK4490EN Datasheet, PDF (29/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490EN]
3. Digital filter
The AK4490EN has four kinds of digital filter selected by SSLOW, SD and SLOW pins. Different sound
qualities on playback can be selected by these filters.
SSLOW pin
L
L
L
L
H
SD pin
L
L
H
H
-
Table 7. Digital Filter Setting
SLOW pin
Mode
L
Sharp roll-off filter
H
Slow roll-off filter
L
Short delay Sharp roll-off filter
H
Short delay Slow roll-off filter
-
Super Slow roll-off filter
(default)
The AK4490EN can be operated on a slower sampling frequency. This mode is available when the
SSLOW pin = “H”.
(2) Serial Mode (PSN pin = “L”)
1. Manual Setting Mode (ACKS bit = “0”)
MCLK frequency is detected automatically and the sampling speed is set by DFS2-0 bits (Table 8). The
MCLK frequency corresponding to each sampling speed should be provided externally (Table 9). The
AK4490EN is set to Manual Setting Mode at power-up (PDN pin = “L” →“H”). When DFS2-0 bits are
changed, the AK4490EN should be reset by RSTN bit.
DFS2
0
0
0
0
1
1
1
1
Table 8. Sampling Speed (Manual Setting Mode @Serial Mode)
DFS1 DFS0
Sampling Rate (fs)
0
0 Normal Speed Mode 30kHz  54kHz
(default)
0
1
Double Speed Mode 54kHz  108kHz
1
0
Quad Speed Mode 120kHz  216kHz
1
1
Reserved
-
0
0
Oct Speed Mode
0
1
Hex Speed Mode
384kHz
768kHz
1
0
Reserved
-
1
1
Reserved
-
015013666-E-01
- 29 -
2015/12