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Linear Technology's New Simple To Use Active RC Filters
The new LTC1563-X range of active filters offer excellent performance over a large range with only an additional resistor required to set the cut-off frequency.
The LTC®1563-2/LTC1563-3 are a family of extremely easy-to-use, active RC lowpass filters with rail-to-rail inputs and outputs and low DC offset suitable for systems with a resolution of up to 16 bits. The LTC1563-2, with a single resistor value, gives a unity-gain Butterworth response. The LTC1563-3, with a single resistor value, gives a unity-gain Bessel response. The proprietary architecture of these parts allows for a simple resistor calculation:
R = 10k (256kHz/fC); fC = Cutoff Frequency
where fC is the desired cutoff frequency. For many applications, this formula is all that is needed to design a filter. By simply utilizing different valued resistors, gain and other responses are achieved.
The LTC1563-X features a low power mode, for the lower frequency applications, where the supply current is reduced by an order of magnitude and a near zero power shutdown mode.
The LTC1563-Xs are available in the narrow SSOP-16 package (SO-8 footprint).
The company's Web site address is http://www.linear-tech.com/.
[Reprinted with kind permission from Linear Technology]
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