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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 480

DC accurate filter eases PLL design

Nello Sevastopoulos and Phillip Karantzalis

Abstract

The LTC1062, a versatile, DC accurate, instrumentation lowpass filter with gain and phase that closely approximate a 5th order Butterworth filter, is described.

Keywords

Filter design

DC accurate filter

LTC1062

The LTC1062 is a versatile, DC accurate, instrumentation lowpass filter with gain and phase that closely approximate a 5th order Butterworth filter. The LTC1062 is quite different from presently available lowpass switched capacitor filters because it uses an external (R,C) to isolate the IC from the input signal DC path, thus providing DC accuracy. The DC accurate output, pin 7 of Figure 480.1, is buffered by an internal op amp ...

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