AK4392 Datasheet, PDF (38/41 Pages) Asahi Kasei Microsystems – High Performance 120dB Premium 32-Bit DAC

[AK4392]
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 AK4392 can achieve this filter
response by combination of the internal filter (Table 16) and an external filter (Figure 21).
Frequency
Gain
20kHz
−0.4dB
50kHz
−2.8dB
100kHz
−15.5dB
Table 16. Internal Filter Response at DSD Mode
AOUT-
2.0k
2.8Vpp
2200p
2.0k
AOUT+
2.8Vpp
1.8k
3300p
1.8k
4.3k
4.3k
1.0k
1.0k
270p
270p
+Vop
-
+
-Vop
Analog
Out
6.34Vpp
Figure 21. External 3rd Order LPF Circuit Example for DSD
Frequency
Gain
20kHz
−0.05dB
50kHz
−0.51dB
100kHz
−16.8dB
DC gain = 1.07dB
Table 17. 3rd Order LPF (Figure 21) Response
MS1045-E-02
- 38 -
2009/04