The MAX281 is a 5th-order zero-error Bessel lowpass filter that utilizes an external resistor and capacitor to isolate the integrated circuit from the DC signal path. This design provides a DC-accurate output while using an internal or external clock to drive the switched-capacitor network.
The device offers flexibility in operation, supporting either an internal oscillator (140kHz nominal) or an externally supplied clock. It features selectable divider ratios for the clock-to-cutoff frequency ratio and includes options for buffered outputs via an on-chip amplifier.
| DC Error | No DC error |
|---|---|
| Low Passband Noise | To 20kHz Cutoff Frequency |
| Operating Supply Voltage (Dual) | +/-5V |
| Input Frequency Range | 0-20 kHz |
| Internal Oscillator Frequency (MAX281A) | 140kHz nominal |
| Max Clock Frequency | 4 MHz |
| Offset Voltage (MAX281B) | 20 mV |
Yes, it operates either on its internal oscillator or an externally supplied clock.
The maximum clock frequency is 4 MHz.