Adc filter plots, Section 7 – Cirrus Logic CS4234 User Manual
Page 70
DS899F1
70
CS4234
7. ADC FILTER PLOTS
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
−100
−90
−80
−70
−60
−50
−40
−30
−20
−10
0
Frequency (normalized to Fs)
Amplitude (dB)
Stopband Rejection
0.4
0.42
0.44
0.46
0.48
0.5
0.52
0.54
0.56
0.58
−100
−90
−80
−70
−60
−50
−40
−30
−20
−10
0
Frequency (normalized to Fs)
Amplitude (dB)
Transition Band
0.6
Figure 32. ADC Stopband Rejection
Figure 33. ADC Transition Band
0.45
0.46
0.47
0.48
0.49
0.5
0.51
0.52
0.53
0.54
0.55
−10
−9
−8
−7
−6
−5
−4
−3
−2
−1
0
Frequency (normalized to Fs)
Amplitude (dB)
Transition Band (Detail)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
−0.05
−0.04
−0.03
−0.02
−0.01
0
0.01
0.02
0.03
0.04
0.05
Frequency (normalized to Fs)
Amplitude (dB)
Passband Ripple
Figure 34. ADC Transition Band (Detail)
Figure 35. ADC Passband Ripple
0
2
4
6
8
10
12
14
16
18
20
−3
−2.5
−2
−1.5
−1
−0.5
0
Frequency (Hz)
Amplitude (dB)
High−Pass Filter Response (Fs = 48kHz)
0
2
4
6
8
10
12
14
16
18
20
−3
−2.5
−2
−1.5
−1
−0.5
0
Frequency (Hz)
Amplitude (dB)
High−Pass Filter Response (Fs = 96kHz)
Figure 36. ADC HPF (48 kHz)
Figure 37. ADC HPF (96 kHz)