AK4452VN Datasheet, PDF (88/91 Pages) Asahi Kasei Microsystems – 115dB 768kHz 32-bit 2ch Premium DAC

[AK4452]
It is recommended for SACD format book (Scarlet Book) that the filter response at SACD playback is an analog
low pass filter with a cut-off frequency of maximum 50kHz and a slope of minimum -30dB/Oct. The AK4452
can achieve this filter response by combination of the internal filter (Table 32) and an external filter (Figure 80).
Frequency
Gain
DSDF bit
0
1
20kHz
0.8dB
-0.2dB
50kHz
5.5dB
-6.3dB
100kHz
19.9dB
-23.7dB
Table 32. Internal Filter Response at DSD Mode
AOUT-
2.0k
2.8Vpp
2200p
AOUT+
+
2.0k
2.8Vpp
1.8k
3300p
1.8k
4.3k
4.3k
1.0k
1.0k
270p
270p
+Vop
-
+
-Vop
Analog
Out
6.34Vpp
Figure 80. External 3rd Order LPF Circuit Example for DSD
Frequency
Gain
20kHz
0.05dB
50kHz
0.51dB
100kHz
16.8dB
DC gain = 1.07dB
Table 33. 3rd Order LPF (Figure 80) Response
Rev. 0.1
- - 88 - -
2014/04