LTC1068-25IG#PBF

Overview

The LTC1068-25IG#PBF is a clock-tunable, quad second-order switched-capacitor filter building block from Analog Devices. It integrates four matched, low-noise filter sections in a 28-pin SSOP package. The device features a fixed clock-to-center frequency ratio of 25:1. It operates on supply voltages ranging from 3.14V to ±5.5V and supports industrial temperature ranges from -40°C to +85°C. Key electrical parameters include a typical power supply current of 8mA at ±5V, a maximum clock frequency of 5.6MHz, and a center frequency error of ±0.3% typical.

Feature Summary

• Contains four identical second-order filter sections within a single surface-mount package
• Provides precise clock-to-center frequency tuning with minimal section-to-section matching error
• Supports multiple operating modes including notch, highpass, bandpass, and lowpass configurations
• Operates efficiently with low power supply current requirements across various voltage levels

Applications

• Dual matched fourth-order Butterworth lowpass filters
• Clock-tunable bandpass or bandreject (notch) filters
• High-speed universal filter building blocks for signal processing

Procurement Notes

Verify the specific suffix IG#PBF confirms the industrial temperature range and lead-free finish. Confirm the package type matches the design requirements. Check for RoHS compliance documentation. Ensure the supplier provides valid traceability for the Analog Devices manufacturer part number.

Selection Notes

Select this variant when a 25:1 clock-to-center frequency ratio is required. Compare noise specifications against other family members like the LTC1068-50 if lower frequencies are needed. Verify that the external clock source can meet the maximum frequency requirements for the desired Q factor and center frequency.

Part Context

This component belongs to the LTC1068 series of universal switched-capacitor filters. The series includes variants with different nominal ratios such as 200:1, 100:1, and 50:1. All variants share similar pinouts and internal architectures but differ in their default clock-to-frequency scaling factors.

Replacement Considerations

LTC1068-25CG#PBF offers the same functionality with a commercial temperature range instead of industrial.