7.2
DAC Output Filter
The CS42448 is a linear phase design and does not include phase or amplitude compensation for an ex-
ternal filter. Therefore, the DAC system phase and amplitude response will be dependent on the external
analog circuitry. Shown below is the recommended active and passive output filters.
1800 pF
4.75 kΩ
DAC1-4
390 pF
C0G
C0G
5.49 kΩ
2.94 kΩ
22 µF
-
AOUTx -
AOUTx +
562Ω
+
47.5 k Ω
1200 pF
C0G
1.65 kΩ
887 Ω
5600 pF
1.87 kΩ
22 µF
C0G
Figure 30. Active Analog Output Filter
DAC1-4
3.3 µF
Ω
560
AOUTx+
+
C
R
ext
10 kΩ
Rext+ 560
C =
Figure 31. Passive Analog Output Filter
4πFSRext560
DS648PP2
59
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