LTC1065IN8#PBF

Overview

The LTC1065IN8#PBF is a monolithic, clock-tunable, linear phase 5th order Bessel lowpass filter with DC accuracy. It operates from ±2.375V to ±8V supplies and features an internal oscillator or external clock input. The cutoff frequency is set by a 100:1 clock-to-cutoff ratio, reaching up to 50kHz maximum. Key electrical parameters include a typical output DC offset of 0mV at ±5V supply (±5mV max), 80µVRMS wideband noise, and 50µVRMS clock feedthrough. It provides 80dB typical common-mode rejection and maintains low distortion with a THD + Noise of 87dB at 2VRMS output.

Feature Summary

• Provides a 5th order Bessel polynomial frequency response for linear phase characteristics.
• Features clock-tunable cutoff frequency controlled by internal RC or external clock signals.
• Delivers high DC accuracy with minimal output offset voltage drift across operating conditions.
• Supports cascading multiple units to achieve steeper roll-off rates.

Applications

• Anti-aliasing filters in data acquisition systems
• Audio signal processing requiring linear phase
• Strain gauge amplifier conditioning
• Low-level signal filtering applications

Procurement Notes

Verify the specific suffix IN8 corresponds to the 8-pin PDIP package and industrial temperature range (-40°C to 85°C). Confirm RoHS compliance via the #PBF designation. Check current availability status as distribution may vary. Ensure ordering documentation matches the Analog Devices part number exactly to avoid pinout mismatches with similar variants.

Selection Notes

Select this component when a Bessel response is required for minimal transient overshoot. The internal oscillator simplifies design by allowing cutoff tuning via a single resistor and capacitor. Verify that the required clock frequency falls within the supported range for the chosen power supply voltage. Consider the 100:1 clock-to-cutoff ratio when determining timing components.

Part Context

This device belongs to the LTC1065 family of analog filters manufactured by Analog Devices. It is pin-compatible with the LTC1063, which offers a Butterworth response. The IN8 variant specifically denotes the industrial temperature grade housed in an 8-lead plastic DIP package. It serves as a direct replacement for legacy Linear Technology parts in existing designs.

Replacement Considerations

The LTC1063 is a pin-compatible alternative offering a Butterworth response instead of Bessel. For higher-order filtering, consider the LTC1064 series. Verify that the replacement maintains the required phase linearity and cutoff frequency stability for the specific application constraints.