LTC1064-3CN

Overview

The LTC1064-3CN is a monolithic 8th-order lowpass Bessel filter housed in a 14-pin PDIP package. It provides a linear phase response over its entire passband and requires no external components other than an external TTL or CMOS clock to program the cutoff frequency. The device supports three clock-to-cutoff ratios: 75:1, 120:1, and 150:1, with a maximum cutoff frequency of 95kHz. It operates from dual power supplies ranging from ±2.37V to ±8V. Key electrical characteristics include a total wideband noise of 60µVRMS at ±7.5V, a total harmonic distortion of 0.03% or better, and a maximum output DC offset of 150mV.

Feature Summary

• Monolithic 8th-order lowpass Bessel filter architecture providing linear phase response across the full passband without requiring external passive components.
• Frequency programmability via external TTL or CMOS clock signals, supporting selectable clock-to-cutoff frequency ratios of 75:1, 120:1, and 150:1.
• Low noise performance with a total wideband noise specification of 60µVRMS and low harmonic distortion of 0.03% or better under standard operating conditions.

Applications

• Antialiasing filters for data acquisition systems
• Smoothing filters in signal processing chains
• Tracking high-frequency lowpass filtering applications

Procurement Notes

Verify the specific ordering suffix CN corresponds to the 14-lead plastic DIP (N Package) configuration when sourcing. Confirm that the required operating temperature range aligns with the commercial grade specifications (-40°C to +85°C). Ensure the design accommodates the necessary external clock source and bypass capacitors as detailed in the datasheet application circuits.

Selection Notes

Select this component when an 8th-order Bessel response with precise linear phase characteristics is required in a compact form factor. It is suitable for designs needing a cutoff frequency up to 95kHz determined by an external clock. Consider the ±2.37V to ±8V supply requirement and ensure the available clock signal meets the logic threshold levels specified for the chosen supply voltage.

Part Context

The LTC1064-3CN belongs to the LTC1064 family of high-frequency switched-capacitor filters. It shares pin compatibility with the LTC1064-1, LTC1064-2, and LTC1064-4 variants, which offer different filter responses such as Chebyshev or elliptic functions. This specific part number denotes the commercial temperature range version packaged in a 14-lead PDIP housing.

Replacement Considerations

The LTC1064-3MJ is listed as an obsolete military-grade alternative within the same package family. For current procurement, verify availability of the standard commercial grade parts. No direct cross-model substitutes are confirmed in the provided documentation; consult manufacturer resources for updated obsolescence status.