Cirrus Logic CS4234 - 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)