LTC1068-25IG#TRPBF

Overview

The LTC1068-25IG#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 features a fixed clock-to-center frequency ratio of 25:1. It operates on supply voltages ranging from 3.14V to ±5.5V. The industrial temperature grade (IG suffix) supports operation between -40°C and +85°C. Electrical characteristics include a typical center frequency error of ±0.3% and a maximum power supply current of 15mA at ±5V.

Feature Summary

• Integrates four identical second-order filter sections in a single surface-mount package
• Provides precise clock-to-center frequency tuning with a nominal 25:1 ratio
• Supports multiple operating modes including notch, highpass, bandpass, and lowpass configurations
• Operates efficiently with single or dual power supplies

Applications

• Dual matched fourth-order Butterworth lowpass filters
• Clock-tunable bandpass and bandreject filter designs
• High-order filter cascading for signal processing

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. Ensure the component matches the required clock-to-frequency ratio specifications for the target application design.

Selection Notes

Select this variant when a 25:1 clock-to-center frequency ratio is required. Compare noise performance and maximum Q limits against other family members like the LTC1068-200 or LTC1068-50 based on the desired cutoff frequency range.

Part Context

This component belongs to the LTC1068 series of universal switched-capacitor filters. The series includes variants with different internal ratios, such as 200:1, 100:1, and 50:1, allowing designers to choose the optimal part for specific frequency scaling requirements without changing the external circuit topology significantly.

Replacement Considerations

LTC1068-25CG#TRPBF offers the same electrical performance but is rated for commercial temperature ranges only.