The **MHO364FCG-R** is a high-performance, oven-controlled crystal oscillator (OCXO) manufactured by **Mercury Electronic**. These components are critical in applications requiring extreme frequency stability over a wide temperature range. --- ## 1. Core Technical Specifications The following table outlines the primary electrical and physical characteristics of the MHO364FCG-R series: | Parameter | Specification | | :--- | :--- | | **Component Type** | Oven Controlled Crystal Oscillator (OCXO) | | **Package Style** | Through-hole (typically 5-pin or 14-pin DIP footprint) | | **Frequency Range** | Typically 10.000 MHz to 100.000 MHz | | **Supply Voltage (Vcc)** | +3.3V or +5.0V DC | | **Output Waveform** | CMOS or HCMOS | | **Frequency Stability** | $\pm$0.1 ppb to $\pm$50 ppb (depending on grade) | | **Operating Temperature** | -20°C to +70°C (Standard) or -40°C to +85°C (Industrial) | | **Warm-up Time** | < 3 to 5 minutes to reach specified stability | --- ## 2. Key Electronic Components & Features The "OCXO" architecture involves several internal sub-circuits that differentiate it from standard crystal oscillators: ### A. The Internal Oven (Heating Element) Unlike standard oscillators, the MHO364FCG-R contains a resistive heating element and a thermistor. This creates a closed-loop thermal control system that keeps the quartz crystal at a constant "turn-over" temperature (usually around 75°C to 85°C), making it immune to external ambient temperature fluctuations. ### B. SC-Cut or AT-Cut Crystal Depending on the specific precision requirement, these units use high-Q factor quartz blanks. SC-cut (Stress Compensated) crystals are often preferred in this series for better thermal stability and lower sensitivity to mechanical stress. ### C. Voltage Control (VCTCXO functionality) The "FCG" designation often implies specific pinning for **Voltage Control**. This allows the user to fine-tune the output frequency by applying a small DC voltage (typically 0 to 3.3V) to a specific pin to compensate for long-term aging. --- ## 3. Pin Configuration (Typical) While you should always consult the specific datasheet for the "R" revision, the standard layout for this package type is: 1. **V_c (Control Voltage):** Used for frequency tuning. 2. **N.C. or V_ref:** No connection or Reference Voltage output. 3. **Vcc:** Positive Power Supply. 4. **RF Output:** The clock signal. 5. **GND:** Case and circuit ground. --- ## 4. Typical Applications Due to its high stability, the MHO364FCG-R is commonly found in: * **Base Stations:** Synchronizing timing for 4G/5G cellular networks. * **Test & Measurement:** Internal clock for frequency counters and spectrum analyzers. * **Satellite Communications:** Precise local oscillators for up/down conversion. * **Network Switches:** Stratum 3 timing requirements.