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Figure 14. 2- and 3-pole butterworth filters, Figure 15. hybrid digital/analog attenuation, Figure 16. hybrid analog/digital attenuation – Cirrus Logic CS4221 User Manual

Page 27: 14 for, Gure 14 provide, Ure 15, will

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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

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