The **MHO+26TDD-R** is a high-precision, high-frequency **Oven Controlled Crystal Oscillator (OCXO)** manufactured by MtronPTI. These components are designed for applications requiring extreme frequency stability over varying temperature ranges. --- ### 1. Key Technical Specifications | Parameter | Value / Range | | :--- | :--- | | **Center Frequency** | Typically 10.000 MHz (Commonly used) | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage ($V_{cc}$)** | +3.3V or +5.0V (Variant dependent) | | **Frequency Stability** | ±10 ppb to ±50 ppb (Parts per billion) | | **Operating Temp Range** | -40°C to +85°C | | **Package Style** | Through-hole (DIP-14 compatible footprint) | --- ### 2. Core Electronic Characteristics #### A. The "Oven" Mechanism The "O" in OCXO stands for **Oven**. Inside the MHO+26TDD-R, the quartz crystal is placed inside a specialized thermal enclosure (oven). - **Heating Element:** Maintains the crystal at a specific "turning point" temperature (usually around 75°C–80°C). - **Stability:** By keeping the crystal at a constant temperature, the device avoids frequency drifts caused by ambient temperature changes. #### B. Frequency Adjustment (Control Voltage) The "TDD" designation often refers to the specific tuning and drive configuration. These units typically feature a **V_control** pin: - Allows for fine-tuning of the output frequency via an external analog voltage. - Used to compensate for **aging** (the natural drift of crystal frequency over years). #### C. Phase Noise and Jitter This part is engineered for **Low Phase Noise**. In electronic communication, high phase noise causes "jitter," which leads to data errors. The MHO series is optimized to provide a very "clean" sine or square wave. --- ### 3. Pin Configuration (Typical DIP-14) | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | V_control | Voltage input for frequency tuning | | **7** | Case GND | Ground connection | | **8** | Output | RF Frequency output (CMOS) | | **14** | V_cc | DC Power Supply | --- ### 4. Common Applications Due to its high stability, the MHO+26TDD-R is used in: * **Base Stations:** Synchronizing timing in 4G/5G cellular towers. * **Test & Measurement:** Internal clock reference for spectrum analyzers and counters. * **Network Switches:** High-speed data synchronization (Synchronous Ethernet). * **GPS/GNSS Receivers:** Maintaining timing when satellite signals are momentarily lost. ---