The **MHO+35TCD-R** is a high-performance **Oven Controlled Crystal Oscillator (OCXO)**. It is part of a specialized category of electronic components designed to provide an extremely stable frequency source by keeping the internal crystal at a constant temperature. ### 1. Technical Specifications The following table highlights the core electronic characteristics of the MHO series: | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | OCXO (Oven Controlled Crystal Oscillator) | | **Output Type** | CMOS / TTL Compatible | | **Supply Voltage (Vcc)** | +5.0V or +3.3V (Model dependent) | | **Package Style** | Through-hole (DIP-14 or similar footprint) | | **Frequency Stability** | ±0.05 ppm to ±0.5 ppm (depending on range) | | **Operating Temperature** | -40°C to +85°C (Standard Industrial) | | **Warm-up Time** | < 3 minutes to reach stable frequency | --- ### 2. Key Electronic Features #### A. The Internal Oven Control The "O" in OCXO stands for **Oven**. Inside the MHO+35TCD-R, there is a heating element and a temperature sensor. - **Thermal Equilibrium:** It heats the quartz crystal to a specific "turning point" temperature (usually around 75°C–85°C) where the frequency-to-temperature curve is flattest. - **Power Consumption:** During startup, the part draws higher current (Inrush current) to heat up. Once the set temperature is reached, current consumption drops to a "steady-state" level. #### B. Frequency Adjustment (Voltage Control) The "CD" or "R" designations often refer to specific pin configurations or tuning capabilities. - **Electronic Frequency Control (EFC):** Many MHO models feature a control voltage pin that allows for fine-tuning the output frequency to compensate for aging over several years. #### C. Low Phase Noise This part is engineered for low phase noise, meaning it has very little "jitter." This is critical for high-speed communication systems where timing errors can lead to data loss. --- ### 3. Application Use Cases Because of its high stability, the MHO+35TCD-R is typically used in: 1. **Telecommunications:** Base stations (LTE/5G) and small cells. 2. **Test & Measurement:** Frequency counters and signal generators. 3. **Broadcasting:** Sync pulses for digital video/audio equipment. 4. **Data Centers:** Precision timing for network switches. --- ### 4. Schematic Pinout Logic While you should always consult the specific datasheet for your suffix, the standard 4-pin or 5-pin layout generally follows this logic: ```text Pin 1: Voltage Control (EFC) or No Connect Pin 7: Ground (Case) Pin 8: Output (Square Wave CMOS) Pin 14: Supply Voltage (Vcc) ```