LTC1068-200CG#TRPBF

Overview

The LTC1068-200CG#TRPBF is a clock-tunable, quad second-order switched-capacitor filter building block in a 28-lead SSOP package. It contains four matched low-noise sections with a nominal clock-to-center frequency ratio of 200:1. The device operates on supply voltages ranging from 3.14V to ±5.5V and draws up to 9.5mA at ±5V. Key electrical parameters include an internal op amp GBW of 6MHz, slew rate of 10V/µs, and typical center frequency error of ±0.3%. It supports various filter topologies including lowpass, highpass, bandpass, and notch configurations.

Feature Summary

• Integrates four identical second-order switched-capaculator filter sections within a single surface-mount package.
• Provides precise clock-tunable filtering with a fixed 200:1 clock-to-center frequency ratio for the CG variant.
• Supports multiple operating modes (Mode 1, 1b, 2, 3) to adjust frequency ratios and transfer functions using external resistors.

Applications

• Designing dual matched fourth-order Butterworth lowpass filters
• Implementing universal low noise eighth-order filter building blocks
• Creating clock-tunable bandpass or bandreject (notch) filters

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm that the CG designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure the clock source meets the required duty cycle and voltage threshold specifications for reliable operation.

Selection Notes

Select the LTC1068-200 variant specifically when a 200:1 clock-to-center frequency ratio is required. Compare against the standard LTC1068 (100:1), LTC1068-50 (50:1), and LTC1068-25 (25:1) based on the desired maximum cutoff frequencies. Consider the IG suffix if an industrial temperature range (-40°C to 85°C) is necessary for the application environment.

Part Context

This component belongs to the Analog Devices LTC1068 series of universal switched-capacitor filters. The family includes variants with different nominal clock-to-frequency ratios (100:1, 50:1, 25:1) to accommodate various bandwidth requirements while maintaining the same pinout and functional architecture.

Replacement Considerations

LTC1068-200IG#TRPBF serves as the industrial temperature grade equivalent. Other family members like LTC1068-50CG#TRPBF offer different frequency scaling but share the same package and interface.