The **CDBKB455KCAY07-R0** is a specific surface-mount ceramic discriminator manufactured by **Murata Electronics**. It is primarily used in communication equipment for FM detection. ### 1. Component Overview Ceramic discriminators are resonant devices that convert frequency changes into voltage changes. This specific model belongs to the **CDBKB** series, designed to work with integrated circuits (ICs) for FM demodulation. --- ### 2. Technical Specifications Below are the key electronic characteristics of the CDBKB455KCAY07-R0: | Parameter | Specification | | :--- | :--- | | **Center Frequency (fo)** | 455 kHz | | **Demodulation Output** | ≥ 30 mV (at fo ± 4.0 kHz) | | **Distortion Factor** | ≤ 2.0% | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -20°C to +80°C | | **Dimensions** | 5.2 x 4.5 x 1.5 mm | | **Packaging** | Tape & Reel (R0 suffix) | --- ### 3. Electronic Functions * **FM Demodulation:** Its core role is to act as the frequency-selective element in an FM detector circuit. When paired with a compatible FM IF IC, it enables the extraction of audio signals from a 455 kHz Intermediate Frequency (IF). * **LC Replacement:** In modern electronics, these ceramic units replace traditional LC (Inductor-Capacitor) tuned circuits because they require no manual adjustment and offer higher stability. * **Impedance Matching:** The internal ceramic structure is tuned to provide a specific phase-shift characteristic at the center frequency, which the IC interprets as the "zero point" for audio recovery. --- ### 4. Circuit Implementation In a typical application, the discriminator is connected to the quadrature detector pins of an FM receiver IC. ```c // Typical Connection Schematic (Simplified) [ FM IF IC ] | |-- Pin: Quadrature Input <--> [ CDBKB455KCAY07-R0 ] |-- Pin: Ground <--> [ Ground ] | [ Audio Output ] ``` ### 5. Part Number Breakdown * **CDB:** Ceramic Discriminator. * **KB:** Series code (SMD type). * **455:** Center Frequency (455 kHz). * **KCAY07:** Internal design code/characteristics (tolerance and bandwidth). * **R0:** Packaging code (180mm diameter plastic tape & reel). ---