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LS204IYDT View Datasheet(PDF) - STMicroelectronics

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LS204IYDT
ST-Microelectronics
STMicroelectronics ST-Microelectronics
LS204IYDT Datasheet PDF : 16 Pages
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LS204
Application information for active low-pass filters
Figure 13. Filter configuration
C2
R1
Vin
R2
C1
Vout
Three parameters are needed to characterize the frequency and phase response of a 2nd
order active filter:
the gain (Gv),
the damping factor (ξ ) or the Q factor (Q = 2 ξ )1),
the cut-off frequency (Fc).
The higher order response is obtained with a series of 2nd order sections. A simple RC
section is introduced when an odd filter is required.
The choice of ξ (or Q factor) determines the filter response (see Table 6).
Table 6. Filter response to ξ or Q factor
Filter response ξ
Q
Cut-off frequency (Fc)
Bessel
-----3-
2
-----1- Frequency at which phase shift is -90°C
3
Butterworth
Chebyschev
-----2-
2
-----1- Frequency at which Gv = -3 dB
2
Frequency at which the amplitude response passes through
-----2-
2
-----1-
2
specified max. ripple band and enters the stop bank.
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