LTC1064-3CJ

Overview

The LTC1064-3CJ is a monolithic 8th-order lowpass Bessel filter housed in a 14-pin CERDIP package. It provides a linear phase response over its entire passband and requires no external components. The cutoff frequency is programmed by an external TTL or CMOS clock, with selectable ratios of 75:1 (Pin 10 at V+), 120:1 (Pin 10 at GND), or 150:1 (Pin 10 at V–). The maximum cutoff frequency is 95kHz. It operates from ±2.37V to ±8V power supplies and features 60µVRMS total wideband noise and 0.03% THD.

Feature Summary

• Monolithic 8th-order lowpass Bessel filter providing linear phase response
• Clock-programmable cutoff frequency with multiple ratio options
• No external components required for operation
• Low total output DC offset and low harmonic distortion

Applications

• Antialiasing filters
• Smoothing filters
• Tracking high frequency lowpass filters

Procurement Notes

Verify the specific ordering suffix against official Analog Devices documentation to confirm the package type and temperature range. The 'CJ' designation indicates a 14-lead ceramic dual in-line package with a commercial operating temperature range. Ensure compatibility with existing board layouts as this package may be obsolete compared to newer alternatives.

Selection Notes

Select the LTC1064-3CJ when a compact 8th-order Bessel filter is needed without external passive components. Consider the available clock-to-cutoff frequency ratios (75:1, 120:1, 150:1) to determine the maximum achievable bandwidth. Verify that the required supply voltage range falls within ±2.37V to ±8V and that the input signal levels do not exceed the specified limits.

Part Context

The LTC1064-3 is part of a family of switched-capacitor filters that includes pin-compatible variants such as the LTC1064-1, LTC1064-2, and LTC1064-4. These devices share similar architectural features but differ in filter order or configuration. The LTC1064-3 specifically offers an 8th-order response in a 14-pin package, distinguishing it from other members of the series.

Replacement Considerations

The datasheet identifies the N package (14-lead PDIP) as an alternate source for the C package. The J package (14-lead CERDIP) is marked as obsolete. Designers should evaluate the N package for direct replacement if leaded plastic packaging is acceptable.