AK4495EQ Datasheet, PDF (58/63 Pages) Asahi Kasei Microsystems – Quality-oriented Premium 32-Bit 2ch DAC

[AK4495S/95]
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
AK4495S/95 can achieve this filter response by combination of the internal filter (Table 30) and an external
filter (Figure 40).
Frequency
Gain
20kHz
0.4dB
50kHz
2.8dB
100kHz
15.5dB
Table 30. 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 40. External 3rd Order LPF Circuit Example for DSD
Frequency
Gain
20kHz
0.05dB
50kHz
0.51dB
100kHz
16.8dB
DC gain = 1.07dB
Table 31. 3rd Order LPF (Figure 40) Response
MS1560-E-02
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2014/04