LMF100CIWMX/NOPB

Overview

The LMF100CIWMX/NOPB is a dual high-performance switched capacitor filter manufactured by Texas Instruments. It operates on a wide power supply range of 4 V to 15 V and supports clock frequencies up to 100 kHz. The device features an f0 × Q range up to 1.8 MHz and low offset voltage, typically ±5 mV in 50:1 mode. It provides crosstalk isolation of -60 dB and a clock-to-center frequency ratio accuracy of ±0.2%. Designed for surface mount applications, it utilizes a 20-pin SOIC package.

Feature Summary

• Dual independent second-order filter blocks capable of realizing various filtering functions including allpass, highpass, notch, bandpass, and lowpass.
• High performance CMOS architecture with significantly improved offset voltage and frequency range compared to the pin-compatible MF10.
• Flexible configuration modes allowing fourth-order biquadratic function realization within a single package through internal cascading.

Applications

• Replacing active RC filters to achieve reduced form factors and higher accuracy.
• Audio processing systems requiring precise frequency response characteristics.
• Communication equipment utilizing classical filter topologies such as Butterworth, Bessel, Elliptic, and Chebyshev.

Procurement Notes

Verify component authenticity against official datasheets before integration. Confirm that the specific ordering suffix aligns with required packaging and temperature grades. Ensure design compliance with the manufacturer's notice regarding new design recommendations.

Selection Notes

Evaluate the required center frequency and quality factor against the device's f0 × Q limit of 1.8 MHz. Check compatibility with available clock sources and supply voltages within the 4 V to 15 V range. Consider thermal management requirements for the SOIC-20 package in enclosed environments.

Part Context

This component belongs to the LMF100 family of switched capacitor filters. It serves as a modernized alternative to legacy analog silicon gate CMOS filters, offering enhanced performance metrics while maintaining pin compatibility with older industry standards like the MF10 for easier migration.

Replacement Considerations

The LMF100CIWM is the direct pin-compatible predecessor. Designers should verify if the 'Not Recommended for New Designs' status impacts long-term supply availability or if a newer generation filter IC is more suitable for current projects.