The CFU455F2 is a ceramic filter manufactured by Murata Electronics North America. It is specifically designed for use in intermediate frequency (IF) stages of radio receivers. The filter is centered at 455 kHz, a common IF frequency in many AM and FM receivers. The CFU455F2 is used to selectively pass signals around this frequency while rejecting unwanted signals and noise, improving the receiver's selectivity and sensitivity.

Applications:

• AM Radio Receivers: Used in AM radio receivers to filter out unwanted signals and improve selectivity.
• FM Radio Receivers: Employed in FM radio receivers as part of the IF filtering stage.
• Communication Equipment: Used in various communication devices, such as walkie-talkies and two-way radios.
• Wireless Audio Systems: Integrated into wireless microphones and audio transmitters.
• Industrial Control Systems: Employed in industrial control systems where reliable signal filtering is required.

Features:

• Center Frequency: 455 kHz center frequency.
• Narrow Bandwidth: Provides a narrow bandwidth for high selectivity.
• Low Insertion Loss: Minimizes signal loss within the passband.
• High Attenuation: Offers high attenuation of out-of-band signals.
• Compact Size: Small form factor for space-constrained applications.

Benefits:

• Improved Selectivity: Enhances the receiver's ability to select the desired signal while rejecting interference.
• Reduced Noise: Filters out unwanted noise, improving signal clarity.
• Stable Performance: Provides stable performance over temperature variations.
• Easy Integration: Simple integration into radio receiver circuits.
• Reliable Operation: Ensures reliable performance in various operating conditions.

Specifications:

While the specifications may vary slightly, typical specifications for the CFU455F2 include:

• Center Frequency: 455 kHz ± 2 kHz.
• Bandwidth: Typically ± 3 kHz at 6 dB.
• Insertion Loss: Typically 4 dB.
• Attenuation: Typically 40 dB at ± 20 kHz.
• Input/Output Impedance: Typically 2 kOhms.
• Operating Temperature: -20°C to +80°C.

The CFU455F2 from Murata Electronics North America is a ceramic filter specifically designed for intermediate frequency (IF) filtering in radio receivers. Its narrow bandwidth, low insertion loss, and high attenuation of out-of-band signals make it a suitable choice for enhancing selectivity and reducing noise in AM and FM radio applications.