Instruction Manual

70 DS773F1
CS42L55
9. ADC & DAC DIGITAL FILTERS
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
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.
5
−0.25
−0.2
−0.15
−0.1
−0.05
0
0.05
0.1
0.15
0.2
0.25
Frequency (normalized to Fs)
Amplitude dB
Figure 27. ADC Passband Ripple Figure 28. ADC Stopband Rejection
0.4 0.43 0.46 0.49 0.52 0.55 0.58 0.61 0.64
−100
−90
−80
−70
−60
−50
−40
−30
−20
−10
0
Frequency (normalized to Fs)
Amplitude dB
0.45 0.46 0.47 0.48 0.49 0.5 0.51 0.52 0.53 0.54 0.5
5
−10
−9
−8
−7
−6
−5
−4
−3
−2
−1
0
Frequency (normalized to Fs)
Amplitude dB
Figure 29. ADC Transition Band Figure 30. ADC Transition Band Detail
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
−90
−80
−70
−60
−50
−40
−30
−20
−10
0
frequency (Normalized to Fs)
Magnitude (dB)
Figure 31. DAC Passband Ripple Figure 32. DAC Stopband
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.4
5
−0.05
−0.04
−0.03
−0.02
−0.01
0
0.01
0.02
0.03
frequency (Normalized to Fs)
Magnitude (dB)
Figure 33. DAC Transition Band Figure 34. DAC Transition Band (Detail)
0.4 0.42 0.44 0.46 0.48 0.5 0.52 0.54 0.56 0.58 0.6
−60
−50
−40
−30
−20
−10
0
frequency (Normalized to Fs)
Magnitude (dB)
0.45 0.46 0.47 0.48 0.49 0.5 0.51 0.52 0.53 0.54
−60
−50
−40
−30
−20
−10
0
frequency (Normalized to Fs)
Magnitude (dB)