The **MHO368FCG-R** is a high-performance, precision **Oven Controlled Crystal Oscillator (OCXO)** manufactured by **Marin**. These components are critical in applications where high frequency stability and low phase noise are required, as they use an internal oven to keep the quartz crystal at a constant temperature. --- ## 1. Technical Specifications The following table outlines the primary electronic characteristics of the MHO368FCG-R series: | Parameter | Specification | Note | | :--- | :--- | :--- | | **Nominal Frequency** | Typically 10.000 MHz | Can vary by specific build | | **Output Type** | CMOS / HCMOS | Square wave output | | **Supply Voltage ($V_{cc}$)** | 3.3V or 5.0V | Dependent on specific sub-model | | **Frequency Stability** | ±10 ppb to ±50 ppb | Over operating temperature | | **Package Style** | Through-Hole (DIP-14 size) | Metal hermetic seal | | **Operating Temp Range** | -40°C to +85°C | Industrial grade | | **Power Consumption** | ~1.5W (Warm-up) / ~0.6W (Stable) | Standard for OCXOs | --- ## 2. Key Internal Components An OCXO like the MHO368FCG-R consists of several integrated sub-systems: ### A. The Quartz Crystal The heart of the unit is a precision-cut quartz crystal (usually **SC-cut** or **AT-cut**). SC-cut crystals are preferred in this model for better thermal stability and lower sensitivity to mechanical stress. ### B. The Oven (Heating Element) Contains a thermistor and a heating power transistor. It maintains the crystal's "turnover temperature" (the point where frequency change relative to temperature is zero). ### C. Temperature Control Circuitry A feedback loop (often a bridge circuit) that monitors the internal temperature and adjusts the heater current to maintain sub-degree thermal precision. ### D. Voltage Regulator & Buffer Internal LDOs (Low Dropout Regulators) ensure that fluctuations in the input supply voltage do not translate into frequency "pushing." --- ## 3. Pinout Configuration The MHO368FCG-R typically follows a standard Euro-package or DIP layout: 1. **V_Control (Optional):** Voltage input for fine frequency tuning (Electronic Frequency Control). 2. **V_Ref (Optional):** Reference voltage output. 3. **Vcc:** Positive power supply. 4. **RF Output:** The generated clock signal. 5. **Ground:** Case and circuit ground. --- ## 4. Typical Applications Due to its high stability, this part is commonly used in: * **Base Stations:** Synchronizing timing in 4G/5G telecommunications. * **Synthesizers:** Low phase noise signal generation in RF equipment. * **Test & Measurement:** Internal reference clocks for frequency counters or spectrum analyzers. * **Network Timing:** PTP (Precision Time Protocol) and Stratum 3/3E clocking.