LTC1064-4CN#PBF

Overview

The LTC1064-4CN#PBF is a quad switched-capacitor filter building block housed in a 24-lead plastic DIP package. It integrates four independent second-order sections capable of realizing lowpass, highpass, bandpass, and notch functions using external resistors. The device supports clock-to-center frequency ratios of 50:1 or 100:1, enabling center frequencies from 0.1Hz to 140kHz. Operating on dual supplies ranging from ±2.375V to ±8V, it features low DC offset (typically 5mV) and wideband noise performance competitive with active RC filters.

Feature Summary

• Integrates four universal second-order filter sections within a single monolithic package
• Supports simultaneous 50:1 and 100:1 clock-to-center frequency tuning ratios
• Provides multiple filter outputs including lowpass, highpass, bandpass, and notch
• Operates with low power supply currents and minimal DC offset voltages

Applications

• Anti-aliasing filters for data acquisition systems
• Wide frequency range tracking filters
• Spectral analysis equipment
• Loop filters in control circuits

Procurement Notes

Verify the #PBF suffix indicates lead-free compliance and RoHS adherence. Confirm the CN suffix corresponds to the 24-lead plastic DIP package. Ensure the AC grade meets specific temperature requirements if operating outside standard ranges. Cross-reference pinouts against the official datasheet to prevent socket mismatches during assembly.

Selection Notes

Select this component when designing multi-stage filters requiring synchronized tuning across multiple bands. Verify that the required Q factor does not exceed limits for the chosen clock ratio mode. Ensure external resistor tolerances are sufficient to maintain center frequency accuracy. Consider buffering outputs if driving low impedance loads to preserve filter characteristics.

Part Context

This part belongs to the LTC1064 family of switched-capacitor filters. It serves as a versatile building block for constructing higher-order filters by cascading its internal sections. The device replaces discrete active RC solutions, reducing board space and component count while maintaining precise frequency response control through external clock signals.

Replacement Considerations

The LTC1064-4CSW offers identical electrical specifications but utilizes a 24-lead SO Wide surface-mount package. Designers transitioning from DIP to SMT must adjust PCB footprints and reflow profiles accordingly.