CS5330A/31A
3.1.11 Digital Filter
Figures 5 through 8 show the attenuation characteristics of the digital filter included in the ADC. The filter
response scales linearly with sample rate. The x-axis has been normalized to Fs, and can be scaled by
multiplying the x-axis by the system sample rate, i.e. 48 kHz.
0
2
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-2
-4
-6
-8
-110
-120
-10
.46
.47
.48
.49
.50
.51
.52
.53
.54
0.0 0.1
0.2 0.3 0.4
0.5
0.6 0.7 0.8
0.9 1.0
Normalized Input Frequency
Normalized Input Frequency
Figure 5. CS5330A/31A Digital Filter Stopband Rejection
Figure 6. CS5330A/31A Digital Filter Transition Band
0.0
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
-0.03
-0.04
-0.05
-10.0
-20.0
-30.0
-40.0
-50.0
-60.0
-70.0
-80.0
-90.0
-100.0
0.40
0.45
0.50
0.60
0.65
0.70
0
0.1
0.2
0.3
0.4
0.5
Normalized Input Frequency
Normalized Input Frequency
Figure 7. CS5330A/31A Digital Filter Passband Ripple
Figure 8. CS5330A/31A Digital Filter Transition Band
DS138F5
13
CIRRUS [ CIRRUS LOGIC ]
