LMF100CIWM

Overview

The LMF100CIWM is a dual high-performance switched capacitor filter manufactured by Texas Instruments in a 20-pin SOIC package. It operates on a wide supply voltage range of 4 V to 15 V and supports clock frequencies up to 100 kHz. The device features a typical clock-to-center frequency ratio accuracy of ±0.2% and an f0 × Q range up to 1.8 MHz. DC offset voltages are typically ±5 mV for the first output and ±15 mV for subsequent outputs. It provides low crosstalk of -60 dB and includes three outputs per filter block: lowpass, bandpass, and notch/allpass/highpass.

Feature Summary

• Dual independent second-order switched capacitor filter blocks
• Pin-compatible with industry standard MF10 with improved performance
• Configurable for various filtering functions including Butterworth, Bessel, Elliptic, and Chebyshev
• Low offset voltage and high clock-to-center frequency ratio accuracy

Applications

• Replacing active RC filters with reduced form factors and higher accuracy
• Audio processing and communication systems
• Instrumentation and medical telemetry equipment

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix 'CIWM' corresponds to the industrial temperature range (-40°C to 85°C) and SOIC-20 package. Check for current availability status as the datasheet indicates this device may be not recommended for new designs.

Selection Notes

Select the LMF100CIWM when pin compatibility with the legacy MF10 is required but superior electrical performance is needed. Ensure the application requires a clock frequency within the 100 kHz limit and operates within the 4 V to 15 V supply range. Consider thermal dissipation requirements for the SOIC-20 package if operating at maximum load conditions.

Part Context

The LMF100 series represents an evolution of the classic MF10 universal switched capacitor filter. Manufactured using TI's LMCMOS process, it offers significantly lower offset voltages and wider operational bandwidth compared to its predecessor. The CIWM variant specifically denotes the industrial temperature grade and surface-mount packaging option.

Replacement Considerations

The LMF100CIWM is pin-for-pin compatible with the MF10. However, verify that the replacement does not require current limiting modes supported by the MF10, as the LMF100 lacks this feature. Direct substitutes include other LMF100 variants such as LMF100CCN for through-hole applications.