LTC1062 1062fd 10Hz 5th Order Butterworth Lowpass Filter is a lowpass filter with no DC error, low passband noise, operates DC to 20kHz, operates on a single 5V supply or up to ±8V, 5th order filter, maximally flat response, internal or external clock, cascadable for faster rolloff, buffer available.
The LTC1062 is a 5th‑order all‑pole maximally flat low‑pass filter with no DC error. Its architecture removes DC offset and low‑frequency noise by placing the filter outside the DC path, and it can operate from a single 5 V supply up to +8 V. The filter’s cutoff frequency is set by an internal clock that can be externally driven, and two devices can be cascaded for a 10th‑order response.
The document lists absolute maximum ratings, electrical characteristics, typical performance curves, and package details. It includes application notes such as antialiasing, digital voltmeter scaling, and filtering of AC signals riding on high DC voltages, along with guidance on oscillator frequency adjustment and external clock usage.
| Supply Voltage Range | +2.5 V to +9 V |
|---|---|
| Input Frequency Range | 0 Hz to 20 kHz |
| Clock‑to‑Cutoff Ratio | 100:1 |
| Maximum Attenuation (100 kHz clock, 1 kHz cutoff) | ≈ 64 dB |
| RMS Noise (DC‑17 kHz) | 100 µV |
The RMS noise from DC to 17 kHz is about 100 µV.
Two LTC1062 devices can be cascaded to form a 10th‑order filter.
Insert a 50 kΩ potentiometer in series with Cosc or use an external capacitor to change the oscillator frequency.