Datasheet

LMV821-N, LMV822-N, LMV822-N-Q1
LMV824-N, LMV824-N-Q1
SNOS032G –AUGUST 1999–REVISED NOVEMBER 2013 www.ti.com
Figure 40. Output signal per the Circuit of Figure 39
DUAL AMPLIFIER ACTIVE FILTERS (DAAFs)
The LMV822/24 bring economy and performance to DAAFs. The low-pass and the high-pass filters of Figure 41
and Figure 42 (respectively), offer one key feature: excellent sensitivity performance. Good sensitivity is when
deviations in component values cause relatively small deviations in a filter's parameter such as cutoff frequency
(Fc). Single amplifier active filters like the Sallen-Key provide relatively poor sensitivity performance that
sometimes cause problems for high production runs; their parameters are much more likely to deviate out of
specification than a DAAF would. The DAAFs of Figure 41 and Figure 42 are well suited for high volume
production.
3 kHz Low-Pass Active Filter with a Butterworth Response and a Pass Band Gain of Times Two
Figure 41. Dual Amplifier
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Product Folder Links: LMV821-N LMV822-N LMV822-N-Q1 LMV824-N LMV824-N-Q1