Datasheet

LPV321, LPV324-N, LPV358-N
www.ti.com SNOS413D –AUGUST 2000–REVISED MARCH 2013
Figure 48. Simple Low-Pass Active Filter
(5)
Figure 49. Frequency Response of Simple Low-pass Active Filter in Figure 9
Note that the single-op-amp active filters are used in to the applications that require low quality factor, Q (≤ 10),
low frequency (≤ 5 kHz), and low gain (≤ 10), or a small value for the product of gain times Q (≤ 100). The op
amp should have an open loop voltage gain at the highest frequency of interest at least 50 times larger than the
gain of the filter at this frequency. In addition, the selected op amp should have a slew rate that meets the
following requirement:
Slew Rate ≥ 0.5 x (ω
H
V
OPP
) X 10
−6
V/µsec
where
• ω
H
is the highest frequency of interest
• V
OPP
is the output peak-to-peak voltage (6)
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: LPV321 LPV324-N LPV358-N