LTC1065CSW#PBF

Overview

The LTC1065CSW#PBF is a monolithic, clock-tunable, linear phase 5th order Bessel lowpass filter with DC accuracy. It operates from ±2.375V to ±8V power supplies and features a typical output DC offset of 1mV. The cutoff frequency is controlled by an internal or external clock with a fixed 100:1 ratio. Key electrical specifications include a maximum cutoff frequency of 50kHz, wideband noise of 80µVRMS, and clock feedthrough of 50µVRMS. The device provides 80dB common mode rejection and maintains low distortion (0.004% THD at 2VRMS). It is housed in a 16-lead SO Wide package.

Feature Summary

• Clock-tunable cutoff frequency using internal RC oscillator or external clock source
• High DC accuracy with typically 1mV output offset voltage
• Linear phase 5th order Bessel response for minimal transient overshoot
• Low clock feedthrough and wideband noise for high signal integrity

Applications

• Anti-aliasing filters in data acquisition systems
• Strain gauge amplifier signal conditioning
• Audio processing requiring flat group delay
• Digital voltmeter input filtering
• Reconstruction filters in DAC outputs

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the SW package variant matches the required PCB footprint. Ensure the operating temperature range aligns with the C grade specification for industrial environments. Cross-reference the manufacturer part number directly with official Analog Devices documentation to avoid counterfeit components.

Selection Notes

Select this component when a precise Bessel response is required alongside tunable cutoff frequencies. Compare against the LTC1063 if a Butterworth response is preferred instead. Consider the power supply requirements, as performance varies between single and dual supply configurations. Evaluate the need for cascading multiple units if steeper roll-off characteristics are necessary for the application.

Part Context

This component belongs to the LTC1065 family of switched-capacitor filters manufactured by Analog Devices. It is pin-compatible with the LTC1063, which offers a Butterworth response. The device represents a solution for applications needing adjustable filtering without digital control interfaces, relying instead on analog clock signals to define bandwidth.

Replacement Considerations

The LTC1063 is a direct pin-compatible alternative offering a Butterworth response instead of Bessel. For higher order filtering, consider the LTC1064 series. Verify that any substitute maintains the required clock-to-cutoff ratio and supply voltage compatibility.