LTC1563-2IGN

The LTC1563-2IGN is an easy-to-use active RC lowpass filter family from LT, designed for systems requiring high resolution up to 16 bits. It offers rail-to-rail input and output voltages and low DC offset, making it suitable for various applications. The LTC1563-2 variant provides a unity-gain Butterworth response, configurable with a single resistor value to set the cutoff frequency between 256Hz and 256kHz. The cutoff frequency accuracy is typically within ±2%.

This filter operates from a single supply voltage ranging from 2.7V to 5V. It exhibits low noise characteristics, with 36µVRMS at 25.6kHz and 60µVRMS at 256kHz. The device is cascadable to form higher-order filters and is available in a narrow SSOP-16 package, which shares the same footprint as an SO-8 package. Its flexibility allows for different resistor values to achieve arbitrary transfer functions with or without gain, supporting cutoff frequencies up to 360kHz using FilterCAD.

Typical applications include discrete RC active filter replacement, antialiasing filters, smoothing or reconstruction filters, linear phase filtering for data communication, and phase locked loops. The proprietary architecture simplifies filter design with a straightforward resistor calculation: R = 10k (256kHz/fC), where fC is the desired cutoff frequency.