The **MHO+57FAAD-R** is a high-precision, high-stability **Oven Controlled Crystal Oscillator (OCXO)** manufactured by **Mercury Electronic**. These components are critical in telecommunications and instrumentation where frequency drift must be minimized despite temperature changes. --- ## 1. Technical Specifications The part number follows a specific coding structure. Below are the primary electronic characteristics associated with this series: | Parameter | Specification (Typical) | | :--- | :--- | | **Output Type** | HCMOS / TTL | | **Package Style** | 14-pin DIP (Full size) or 5-pin Rectangular | | **Supply Voltage** | +5.0 VDC (Standard) | | **Frequency Stability** | $\pm$0.01 ppm to $\pm$0.5 ppm | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Aging Rate** | $\pm$0.5 ppb to $\pm$2.0 ppb per day | | **Warm-up Power** | ~2.5W to 3.5W | --- ## 2. Key Internal Components An OCXO like the MHO+57FAAD-R is more complex than a standard crystal. It contains: * **SC-Cut or AT-Cut Crystal:** The heart of the oscillator, chosen for its thermal properties. * **Heating Element:** A resistive heater used to bring the internal cavity to a specific "turnover" temperature. * **Thermostat/Control Circuit:** A feedback loop (often using a thermistor) that regulates the heater to keep the crystal at a constant temperature (usually around 75°C to 85°C). * **Voltage Regulator:** Ensures the internal oscillator is shielded from fluctuations in the input supply voltage. --- ## 3. Pin Configuration (Common for MHO Series) While you should always verify with the specific datasheet for the "FAAD-R" suffix, the standard 14-pin DIP footprint usually utilizes these pins: 1. **Pin 1 (V_control):** Often used for Electronic Frequency Control (EFC) to tune the frequency via voltage. 2. **Pin 7 (GND):** Case and Circuit Ground. 3. **Pin 8 (Output):** The RF frequency output (HCMOS). 4. **Pin 14 (Vcc):** +5V Supply Input. --- ## 4. Typical Applications Because of its high stability and the "Oven" feature, this part is found in: * **Basestations:** Synchronizing timing in 4G/5G cellular networks. * **Synthesizers:** Serving as a master clock for high-frequency signal generators. * **Measurement Equipment:** Frequency counters and spectrum analyzers. * **Network Switches:** Handling high-speed data synchronization (SDH/SONET).