The **CDBKB455KCAY09-R0** is a specialized electronic component primarily categorized as a **Ceramic Discriminator**. It is manufactured by Murata Electronics and is designed for use in communication equipment. --- ### 1. Technical Specifications Below are the primary technical parameters for this component: | Parameter | Specification | | :--- | :--- | | **Component Type** | Ceramic Discriminator | | **Center Frequency (fo)** | 455 kHz | | **Bandwidth** | ± 4.0 kHz min. (at 3dB) | | **Recovery Voltage** | 35 mV min. | | **Distortion** | 3.0% max. | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Description A ceramic discriminator like the CDBKB455KCAY09-R0 is used in **FM (Frequency Modulation) Demodulation** circuits. - **Purpose:** It converts frequency shifts in an incoming signal into a varying voltage output (audio signal). - **Working Principle:** It utilizes the piezoelectric effect of ceramics. As the input frequency deviates from the center frequency (455 kHz), the phase shift changes linearly, allowing the IC to detect the audio information. - **Application Context:** It is almost always used in conjunction with an FM IF (Intermediate Frequency) integrated circuit (IC). --- ### 3. Key Features * **Small Footprint:** Designed as a "Chip" component to save space on modern PCBs. * **High Stability:** Offers excellent frequency stability against temperature changes. * **Adjustment-Free:** Unlike traditional LC (Inductor-Capacitor) coils, ceramic discriminators do not require manual tuning during production. * **RoHS Compliant:** Meets environmental standards for lead-free electronics. --- ### 4. Common Applications This part is typically found in the following devices: 1. **Two-way Radios:** Used in walkie-talkies and professional mobile radios. 2. **Cordless Phones:** Older analog or digital cordless systems. 3. **Paging Systems:** Used for signal decoding. 4. **Remote Control Receivers:** Short-range communication systems operating in the HF/VHF bands.