LTC1068IG#TRPBF

Overview

The LTC1068IG#TRPBF is a clock-tunable, quad second-order switched-capacitor filter building block from Analog Devices. It integrates four matched, low-noise sections within a 28-lead SSOP package. The device operates on a single 5V supply or dual ±5V supplies, with a minimum operating voltage of 3.14V. The internal clock-to-center frequency ratio is fixed at 100:1 for the standard LTC1068 variant. It supports various filter topologies including lowpass, highpass, bandpass, and notch configurations. The component functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates four identical second-order switched-capaculator filter sections in a compact surface-mount package
• Features low noise performance suitable for precision analog signal processing applications
• Supports flexible filter design through multiple operating modes and external resistor adjustments
• Provides precise center frequency tuning via an external clock source

Applications

• Dual matched fourth-order Butterworth lowpass filters
• Clock-tunable bandpass and notch filter circuits
• High-order active filter construction using FilterCAD software

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm that the IG designation corresponds to the required industrial temperature range for your application environment. Ensure the clock source meets the specified duty cycle and threshold requirements for proper operation.

Selection Notes

Select this part when a 100:1 clock-to-center frequency ratio is required. Compare against LTC1068-200, LTC1068-50, and LTC1068-25 if different frequency ratios are needed. Consider the maximum Q limits relative to the desired center frequency and supply voltage configuration before finalizing the design.

Part Context

This component belongs to the LTC1068 family of universal switched-capacitor filters. It shares the same physical package and core architecture with variants offering different nominal clock ratios. The IG suffix specifically denotes the industrial temperature grade version of the standard LTC1068 model.

Replacement Considerations

LTC1068IG#PBF serves as the tube-packaged equivalent. Other family members like LTC1068-200IG#TRPBF offer different frequency ratios but share similar pinouts.