Cirrus Logic CS4221 - Manual (Page 27)

CS4220 CS4221
DS284PP3 27
Figure 14. 2- and 3-Pole Butterworth Filters
Gain
dB
-10 dB
0 dB
Frequency
T2 = 15 µs
T1 = 50 µs
F1 F2
Figure 15. De-emphasis Curve
Signal
Noise
0
0 -113.5
Attenuation (d B)
A
m
p
li
tude
(d
B)
Analog Digital
Figure 16. Hybrid Analog/Digital Attenuation