## Technical Overview: TPSKA4M50B00-R3 The **TPSKA4M50B00-R3** is a high-performance **Ceramic Discriminator** manufactured by Murata Electronics. It is primarily used in communication equipment for detecting (demodulating) FM signals. It works in conjunction with an Integrated Circuit (IC) to convert frequency variations into audio or data signals. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Center Frequency (fo)** | 4.5 MHz | | **Demodulation Bandwidth** | ±50 kHz min. (at 3dB) | | **Resonant Impedance** | 40 $\Omega$ max. | | **Operating Temperature** | -20°C to +80°C | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 7.5 x 3.0 mm (approx.) | --- ### 2. Functional Description A ceramic discriminator is a type of resonator that utilizes the **Piezoelectric Effect**. In a circuit, it acts as a frequency-sensitive element. * **Frequency Selection:** It is specifically tuned to a center frequency of **4.5 MHz**, which is a standard intermediate frequency (IF) for audio subcarriers in television systems (PAL/NTSC). * **Phase Shifting:** It shifts the phase of the signal based on the frequency deviation. When paired with an FM detector IC (like a quadrature detector), it allows the IC to compare the phase and extract the original audio signal. * **Stability:** Because it is made of ceramic material, it offers better temperature stability and narrower tolerances than standard LC (Inductor-Capacitor) circuits. --- ### 3. Application Areas The TPSKA series is commonly found in the following electronic devices: * **Television Sets:** Processing the 4.5MHz sound carrier. * **VCRs/DVD Players:** Handling audio IF signals. * **Communication Receivers:** FM demodulation stages. * **FM Modems:** Signal recovery in low-frequency wireless data links. --- ### 4. Circuit Implementation Example In a typical application, the discriminator is connected to the quadrature input pins of an FM IF IC. ```c // Representative connection logic (Internal to IC) [IF Signal Input] --> [Limiter Amplifier] --+--> [Phase Detector] --> [Audio Out] | ^ +--> [TPSKA4M50B] --+ (Phase Shifter) ```