LTC1068IG#PBF

Overview

The LTC1068IG#PBF 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 features a nominal clock-to-center frequency ratio of 100:1. It operates on supply voltages ranging from 3.14V to 5.5V or ±5V. Key electrical parameters include a typical center frequency error of ±0.3%, a power supply current of 6.5mA at 4.75V, and a maximum clock frequency of 5.6MHz. The component supports industrial temperature ranges from -40°C to +85°C.

Feature Summary

• Integrates four identical second-order filter sections in a single surface mount package
• Provides precise clock tuning with minimal center frequency error
• Supports multiple operating modes for versatile filter topologies
• Operates efficiently with low power supply current requirements

Applications

• Designing dual matched fourth-order Butterworth lowpass filters
• Implementing high-speed eighth-order linear phase bandpass filters
• Creating tunable notch or bandreject filters for signal processing

Procurement Notes

Verify the specific suffix against official documentation to confirm lead-free finish and temperature grade. Ensure the ordering code matches the required industrial range and package type. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and compliance with RoHS standards before finalizing procurement.

Selection Notes

Select this component when a fixed 100:1 clock-to-frequency ratio is appropriate for the design. Compare it against other family members if different ratios like 25:1 or 200:1 are needed. Consider the available operating modes and noise specifications relative to the target center frequency and supply voltage constraints.

Part Context

This part belongs to the LTC1068 series of universal switched-capacitor filters. It shares the same internal architecture as variants like the LTC1068-25 and LTC1068-200, differing primarily in the factory-set clock-to-center frequency ratio. The IG suffix indicates the industrial temperature grade and plastic SSOP packaging.

Replacement Considerations

Direct substitutes within the same family include the LTC1068CG#PBF for commercial temperature ranges. For different frequency ratios, consider the LTC1068-25IG#PBF or LTC1068-200IG#PBF. Verify pin compatibility and electrical characteristics before substituting.