The **MHO366TAG-R** is a high-performance, oven-controlled crystal oscillator (OCXO) manufactured by **Mercury Electronic**. It is specifically designed for applications requiring extreme frequency stability and low phase noise, such as telecommunications infrastructure and precision measurement devices. --- ## 1. Technical Specifications Below are the primary electronic characteristics typical for the MHO366 series: | Parameter | Specification (Typical) | | :--- | :--- | | **Frequency Range** | 10.000 MHz to 100.000 MHz | | **Supply Voltage (Vcc)** | +3.3V or +5.0V DC | | **Output Waveform** | CMOS or Sine Wave | | **Frequency Stability** | ±5 ppb to ±50 ppb (over temp range) | | **Operating Temperature** | -40°C to +85°C | | **Package Type** | Through-hole (DIP-14 compatible) | | **Power Consumption** | ~2.5W (Warm-up), ~1.0W (Steady state) | --- ## 2. Key Internal Components The "MHO" designation refers to the **Mercury High-precision Oven** architecture. The device consists of several critical electronic sections: ### A. The Crystal Resonator The heart of the unit is a high-Q quartz crystal, usually **SC-cut** (Stress Compensated). SC-cut crystals are preferred in OCXOs because they are less sensitive to thermal shock and mechanical stress compared to standard AT-cut crystals. ### B. Oven Control Circuitry To maintain frequency stability, the crystal is placed inside a thermally insulated "oven." * **Heating Element:** A power transistor or resistor that generates heat. * **Thermistor:** A temperature sensor that provides feedback to the controller. * **PID Controller:** An analog or digital circuit that regulates power to the heater to maintain a constant internal temperature (usually around +75°C to +85°C), regardless of the external environment. ### C. Voltage Regulation Internal low-dropout (LDO) regulators ensure that the oscillator circuit receives a clean, ripple-free voltage, preventing supply noise from affecting the frequency output (Phase Jitter). --- ## 3. Part Number Breakdown (Naming Convention) While specific suffixes can vary by custom order, the general breakdown for the MHO series is as follows: | Code | Meaning | | :--- | :--- | | **MHO** | Mercury High-precision OCXO series | | **366** | Package size and pin configuration (Standard Euro-style/DIP footprint) | | **T** | Temperature stability Grade | | **A** | Supply Voltage (e.g., A = 5.0V, B = 3.3V) | | **G** | Output Logic (e.g., G = CMOS) | | **-R** | RoHS Compliant (Lead-free) | --- ## 4. Typical Applications * **5G Base Stations:** Providing the master clock for cellular synchronization. * **GPS/GNSS Receivers:** Maintaining timing during signal loss (holdover). * **Test Equipment:** Synthesizers and frequency counters. * **Network Switches:** Ensuring data packets are synchronized across high-speed links.