User guide

DS563F2 19
CS5381
3.9 Capacitor Size on the Reference Pin (FILT+)
The CS5381 requires an external capacitance on the internal reference voltage pin, FILT+. The size of this
decoupling capacitor will affect the low frequency distortion performance as shown in Figure 25, with larger
capacitor values used to optimize low frequency distortion performance. The THD+N curves in Figure 25
were measured with VA=VD=VL=5 V in Single-Speed Master Mode with a full-scale sinewave input.
Figure 25. CS5381 THD + N versus Frequency
220 uF
100 uF
47 uF
22 uF
10 uF
1 uF