The **MEH14ZBX-R** is a high-performance, high-stability **TCXO (Temperature Compensated Crystal Oscillator)** manufactured by **Jauch Quartz**. It is specifically designed for applications requiring precise frequency control under varying environmental conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Frequency Range** | Usually 10.0 MHz to 40.0 MHz (Specific to order) | | **Package Type** | SMT (Surface Mount Technology) - 4 Pads | | **Dimensions** | 5.0 x 3.2 x 1.5 mm | | **Supply Voltage ($V_{DD}$)** | +3.3 V (Standard) | | **Output Type** | Clipped Sine Wave | | **Frequency Stability** | ±0.5 ppm to ±2.5 ppm (depending on temp range) | | **Operating Temperature** | -40°C to +85°C (Extended range available) | --- ### 2. Functional Components To understand how the MEH14ZBX-R works, it is essential to look at its internal electronic architecture: 1. **Quartz Crystal Resonator:** The heart of the part, providing the base frequency. 2. **Compensation Network:** An internal analog or digital circuit that measures the ambient temperature and adjusts the load capacitance to counteract the crystal's natural frequency drift. 3. **Clipped Sine Wave Output:** Unlike a square wave (CMOS), a clipped sine wave consumes less power and generates significantly lower electromagnetic interference (EMI/RFI). 4. **Voltage Regulator:** Internal circuitry that ensures frequency stability even if the input supply voltage fluctuates slightly. --- ### 3. Pin Configuration (4-Pad Layout) | Pin # | Symbol | Function | | :--- | :--- | :--- | | **1** | Vcon / NC | Voltage Control (if VC-TCXO) or No Connection | | **2** | GND | Ground / Negative Supply | | **3** | Output | Frequency Signal Output | | **4** | $V_{DD}$ | Positive Supply Voltage (+3.3V) | --- ### 4. Common Applications Due to its high stability (measured in parts per million - **ppm**), this part is commonly found in: * **GPS/GNSS Modules:** Accurate timing for satellite positioning. * **Wireless Communication:** LTE, Wi-Fi, and Bluetooth base stations. * **IoT Devices:** Low-power sensors requiring stable clocking for long-range transmission. * **Network Infrastructure:** Synchronization for routers and switches. --- ### 5. Part Number Breakdown (Generic Jauch Syntax) * **MEH:** Series identifier for TCXO. * **14:** Package size code (5.0 x 3.2 mm). * **Z:** Stability indicator. * **BX:** Temperature range and voltage code. * **R:** Tape & Reel packaging.