Cirrus Logic CS4271 - Manual (Page 33)

CS4271
DS592F1 33
5.4.2 Output Connections
The recommended output filter configuration is shown in Figure 14. This filter configuration accounts for the normally
differing AC loads on the AOUT+ and AOUT- differential output pins. It also shows an AC coupling configuration
which minimizes the number of required AC coupling capacitors.
The CS4271 does not include phase or amplitude compensation for an external filter, and therefore the DAC system
phase and amplitude response will be dependent on the external analog circuitry. Figure 15 shows the full-scale an-
alog output levels.
AOUT+
AOUT- -
+
470 pF
C0G
CS4271
560
Ω 22 µF
4.99 k
Ω 2200 pF
C0G
715 Ω
2.32 k Ω 4.42 k Ω
1.33 k Ω
1.50 k Ω
22
µF
1.5 nF
C0G
6.8 nF
C0G
47 k
Ω
Analog
Out
Figure 14. CS4271 Recommended Analog Output Filter
CS4271
AOUT+
AOUT-
Full-Scale Output Level= (AIN+) - (AIN-)= 5 Vpp
3.75 V
2.5 V
1.25 V
3.75 V
2.5 V
1.25 V
Figure 15. Full-Scale Analog Output