LTC1264CSW

Overview

The LTC1264CSW is a high-speed, quad universal filter building block from Analog Devices Inc. It integrates four identical second-order switched-capacitor filter sections within a single 24-lead SO Wide package. The device supports center frequencies up to 250kHz with a standard clock-to-center frequency ratio of 20:1. It operates on dual supplies ranging from ±2.375V to ±8V or a single 5V supply. Key electrical characteristics include a gain-bandwidth product of 7MHz, a slew rate of 10V/µs, and power supply current of 9mA to 26mA depending on voltage. The component features double-sampling for improved aliasing performance and low harmonic distortion.

Feature Summary

• Integrates four identical second-order switched-capacitor filter sections in a compact package
• Features double-sampling architecture to significantly improve aliasing performance
• Supports multiple filter topologies including lowpass, highpass, bandpass, and notch functions
• Provides flexible operation modes allowing adjustment of the clock-to-center frequency ratio

Applications

• Digital communications systems requiring tunable filtering
• Spread spectrum communications applications
• Spectral analysis equipment
• Loran receivers
• General instrumentation signal processing

Procurement Notes

Verify the specific suffix against official documentation to confirm lead-free status and packaging type. The CSW designation indicates a plastic small outline wide package. Confirm that the #PBF suffix denotes RoHS compliance if required by your manufacturing standards. Ensure the ordering code matches the exact pinout and temperature range specifications found in the manufacturer's datasheet.

Selection Notes

Select this component when designing active filters requiring multiple second-order stages without discrete op-amp mismatches. Consider the maximum center frequency limits based on the chosen Q factor and operating temperature. Ensure the external clock source meets the specified duty cycle and rise/fall time requirements to maintain stability and minimize jitter-induced noise.

Part Context

This part belongs to the LTC1264 family of switched-capacitor filters. It serves as a versatile building block for constructing higher-order filters by cascading its internal sections. The device is designed to replace complex discrete resistor-capacitor-op-amp networks, offering better matching and easier tuning through clock frequency adjustments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.