MF10ACN

Active Filters Overview

The MF10ACN is a monolithic precision voltage-controlled quadrature oscillator manufactured by National Semiconductor. It integrates two operational amplifiers and a voltage-controlled oscillator (VCO) on a single chip to generate sine and cosine outputs with a 90-degree phase relationship. The device operates from dual power supplies, typically ±5 V to ±15 V, and features a wide frequency tuning range controlled by an external resistor and capacitor. Key electrical parameters include a typical center frequency of 10 kHz with specific RC values, a total harmonic distortion of less than 0.1%, and a frequency-to-voltage transfer function linearity error of approximately 0.1%. The component is housed in a standard 14-pin DIP package.

Active Filters Feature Summary

• Generates simultaneous sine and cosine waveforms with precise quadrature phase alignment
• Voltage-controlled frequency tuning via external RC network for flexible signal generation
• Low total harmonic distortion ensures high-fidelity analog output signals
• Integrated design reduces component count compared to discrete oscillator solutions

Active Filters Applications

• Phase-locked loop (PLL) test and measurement equipment
• Frequency modulation (FM) and phase modulation (PM) signal generators
• Analog computer simulation circuits requiring orthogonal signal sources
• Filter testing and characterization systems

Active Filters Procurement Notes

Verify the manufacturer origin as National Semiconductor or its successors, noting that legacy part availability may vary. Confirm the suffix 'A' indicates the commercial temperature grade and 'CN' denotes the ceramic DIP package. Check for updated datasheets from current semiconductor providers holding the rights to this legacy product line to ensure pinout and electrical specifications remain consistent with original documentation.

Active Filters Selection Notes

Select this component when a compact, low-distortion quadrature signal source is required without complex external feedback networks. Ensure the application supports dual polarity power supplies, as the device does not operate on single-supply configurations. Verify that the required frequency range aligns with the external RC component capabilities and that the input control voltage range matches the system's control interface.

Active Filters Part Context

The MF10 series represents a class of specialized analog integrated circuits designed for waveform generation tasks where phase accuracy is critical. Unlike general-purpose op-amps, these devices are optimized for oscillation stability and low noise. The MF10ACN specifically targets applications needing reliable sine/cosine pairs for demodulation or vector signal processing in industrial and scientific instrumentation contexts.

Active Filters Replacement Considerations

Direct replacements may include the LM13700-based custom designs or other legacy quadrature oscillators like the AD633 if differential outputs are acceptable. Verify pin compatibility before substitution. Consult current manufacturer cross-reference guides for equivalent modern parts, ensuring thermal grades and package dimensions match the existing board layout.