LTC1064-3CSW#PBF

Overview

The LTC1064-3CSW#PBF is a monolithic 8th-order lowpass Bessel filter housed in a 16-pin SO-Wide (SOL) 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 operates from ±2.37V to ±8V power supplies, with a maximum cutoff frequency of 95kHz. Key electrical specifications include a total wideband noise of 60µVRMS at ±7.5V, a total harmonic distortion of 0.03% or better, and a maximum clock frequency of 7MHz.

Feature Summary

• Monolithic 8th-order lowpass Bessel filter architecture providing linear phase response across the full passband without requiring external passive components.
• Clock-programmable cutoff frequency selection via Pin 10 configuration, supporting ratios of 75:1, 120:1, and 150:1 relative to the input clock signal.
• Low noise and low harmonic distortion performance suitable for high-fidelity signal processing applications.

Applications

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

Procurement Notes

Verify that the component matches the specific Analog Devices part number LTC1064-3CSW#PBF. Confirm the package type is the 16-lead plastic wide SOIC (SW). Ensure the ordering suffix indicates lead-free compliance if required by the assembly process. Cross-reference the manufacturer's datasheet for any updates regarding pinout or absolute maximum ratings before finalizing procurement.

Selection Notes

Select this component when an 8th-order Bessel response with linear phase characteristics is required in a compact surface-mount form factor. It is appropriate for designs needing programmable cutoff frequencies up to 95kHz driven by an external clock. Consider the ±2.37V to ±8V supply range and ensure the application can accommodate the necessary clock signal levels and duty cycle requirements specified in the datasheet.

Part Context

This component belongs to the LTC1064 family of active filters manufactured by Analog Devices. It is pin-compatible with the LTC1064-1, LTC1064-2, and LTC1064-4 variants, which offer different filter responses such as Butterworth or Chebyshev characteristics. The CSW suffix denotes the commercial temperature range (-40°C to +85°C) and the 16-lead wide SOIC package.

Replacement Considerations

The LTC1064-1, LTC1064-2, and LTC1064-4 are pin-compatible alternatives within the same family. These parts share the same package and pinout but provide different filter responses, such as Butterworth or Chebyshev, instead of the Bessel response found in the LTC1064-3.

FAQ

How is the cutoff frequency ratio determined?

The ratio of the clock frequency to the -3dB cutoff frequency is determined by the DC level applied to Pin 10. Connecting Pin 10 to V+ sets a 75:1 ratio, connecting it to GND sets a 120:1 ratio, and connecting it to V– sets a 150:1 ratio.

What is the maximum operating clock frequency?

For supply voltages of ±7V or higher, the maximum clock frequency is 7MHz. For ±5V supplies, the maximum clock frequency is limited to 4MHz.

Are external components required for operation?

No external passive components are needed for the filter function itself. However, power supply bypass capacitors (0.1µF or larger) are recommended close to the package, and an external clock source is required to program the cutoff frequency.