LTC1064-2CJ

Overview

The LTC1064-2CJ is an 8th-order Butterworth lowpass filter housed in a 14-pin CERDIP package. It provides a maximally flat passband with a –48dB/octave attenuation slope and over 80dB stopband attenuation. The cutoff frequency is programmed by an external TTL or CMOS clock, supporting ratios of 50:1 (Pin 10 at V+) or 100:1 (Pin 10 at V–), with a maximum cutoff of 140kHz. Operating from ±2.37V to ±8V supplies, it delivers 80µVRMS wideband noise and 0.03% THD. No external components are required for basic operation.

Feature Summary

• Monolithic 8th-order Butterworth lowpass filter providing a maximally flat passband response
• Clock-programmable cutoff frequency up to 140kHz without requiring external passive components
• Low wideband noise and harmonic distortion suitable for high-performance signal processing

Applications

• Antialiasing filters for data acquisition systems
• Smoothing filters for precision measurement circuits
• Tracking high-frequency lowpass filtering applications

Procurement Notes

Verify the specific ordering suffix 'CJ' against current manufacturer documentation. The datasheet identifies the J package as obsolete and recommends the N14 PDIP package as an alternate source. Confirm that the component meets the specified –40°C to 85°C operating temperature range and matches the pinout requirements for your design.

Selection Notes

Select this device when an 8th-order Butterworth response is required without external resistors or capacitors. Ensure the system can provide a clean clock signal between 500kHz and 7MHz. Verify power supply stability, as the device requires bypassing near the package pins. Consider the 14-pin DIP form factor if surface mount options are not viable.

Part Context

The LTC1064-2 is part of a family of switched-capacitor filters designed to compete with discrete op-amp RC active realizations. It utilizes an enhanced analog CMOS Si-gate process. The device is pin-compatible with the LTC1064-1, which offers an elliptic response instead of Butterworth, allowing for easy substitution based on filter shape requirements.

Replacement Considerations

The J package is listed as obsolete; consider the LTC1064-2CN (PDIP) as the recommended alternate source. For surface mount needs, the LTC1064-2CSW (16-lead SOIC) is available but requires adapter considerations due to pin count differences.