The **MHO+12FBD-R** is a specific series within the **MHO+** line of high-performance, ultra-low phase noise Oven Controlled Crystal Oscillators (OCXOs) manufactured by **Mercury Electronic**. Below is a detailed breakdown of its electronic components and specifications. --- ### 1. Component Identification The part number can be decoded as follows: | Part Segment | Meaning | | :--- | :--- | | **MHO+** | Series name (High-precision Oven Controlled Crystal Oscillator) | | **12** | Package size (Standard 20.2 x 20.2 mm or 25.4 x 25.4 mm variant) | | **F** | Output Logic Type (typically CMOS or HCMOS) | | **B** | Supply Voltage (usually 3.3V or 5.0V depending on sub-revision) | | **D** | Operating Temperature Range (often -40°C to +85°C) | | **R** | RoHS Compliant / Tape & Reel packaging | --- ### 2. Core Electronic Specifications The MHO+ series is designed for telecommunications and precision instrumentation. | Feature | Specification | | :--- | :--- | | **Frequency Range** | Typically 10 MHz to 100 MHz | | **Frequency Stability** | ±5 ppb to ±50 ppb (Parts per billion) | | **Supply Voltage** | 3.3V or 5.0V DC | | **Power Consumption** | ~2.5W during warm-up; <1.0W at steady state | | **Phase Noise** | Extremely low (e.g., -155 dBc/Hz at 10 kHz offset) | | **Output Waveform** | Square wave (HCMOS/CMOS) or Sine Wave | --- ### 3. Functional Blocks Inside the **MHO+12FBD-R**, several electronic sub-systems work together: 1. **SC-Cut Quartz Crystal:** The heart of the unit. The "SC-cut" (Stress Compensated) crystal is used for its superior thermal stability and lower sensitivity to mechanical stress compared to standard AT-cut crystals. 2. **Heating Element & Thermistor:** A heating resistor and a temperature sensor (thermistor) are wrapped around the crystal. 3. **Control Loop (The "Oven"):** An analog or digital PID controller maintains the internal temperature at the "turn-over point" (the temperature where the crystal's frequency change is zero), usually around 75°C to 85°C. 4. **Buffer/Driver IC:** An internal integrated circuit that converts the crystal's weak oscillation into a robust HCMOS signal capable of driving external loads. --- ### 4. Typical Pin Configuration Most units in this series utilize a 5-pin or 6-pin DIP configuration: 1. **Vcc:** Power Supply input. 2. **Output:** The clock signal frequency. 3. **GND:** Case and circuit ground. 4. **Vref/Vco (Optional):** Voltage control pin for fine-tuning the frequency (Electronic Frequency Control - EFC). 5. **NC:** No connection. --- ### 5. Application Areas * **Base Stations:** 4G/5G LTE timing. * **Synthesizers:** Providing a stable reference for RF equipment. * **Test & Measurement:** High-end oscilloscopes and frequency counters. * **Network Switches:** Synchronous Ethernet (SyncE) and IEEE 1588 PTP.