Fifth-order low-pass filter

The LTC1062 is an integrated fifth-order low-pass filter that stands out by the absence of any d.c. error. This is achieved by keeping the actual filter outside the d.c. range to eliminate matters like d.c. offset and low-frequency interference. It therefore makes the LTC1062 eminently suitable for filter applications where d.c. errors cannot be tolerated. A pivotal role in this is played by external resistor R5. The output signal is fed back to the input of the filter via external capacitor C4. Network R5-C4, in association with the internal switched-capacitor network, provides the fifth-order low-pass function.