The **MHO+27TGD-R** is a specific part number typically associated with **MHO+ series High-Stability Oven Controlled Crystal Oscillators (OCXO)** or high-precision oscillators produced by manufacturers like Mercury Electronic. Below is a breakdown of the electronic components, technical specifications, and internal architecture of this part. --- ### 1. Technical Specifications Table | Parameter | Specification (Typical) | | :--- | :--- | | **Component Type** | Oven Controlled Crystal Oscillator (OCXO) | | **Nominal Frequency** | 27.000 MHz (indicated by "27") | | **Output Type** | CMOS / TTL Compatible | | **Package Type** | DIP-14 (Full size) or SMD equivalent | | **Supply Voltage** | 3.3V or 5.0V (Varies by sub-suffix) | | **Operating Temp Range** | -40°C to +85°C (Standard Industrial) | | **Frequency Stability** | ±0.1 ppm to ±0.01 ppm (High Stability) | --- ### 2. Internal Electronic Parts and Construction An OCXO like the MHO+27TGD-R is a complex module consisting of several sub-components integrated into one metal-can package: #### A. The Quartz Crystal The heart of the device is a high-quality quartz crystal, often an **SC-cut (Stress-Compensated)** or **AT-cut** crystal. This component provides the fundamental resonance frequency. #### B. The Oven (Heating Element) Unlike standard oscillators, the MHO+ series contains a thermal chamber. * **Thermistor:** A temperature sensor that monitors the internal heat. * **Heating Resistor/Transistor:** Controlled by a feedback loop to keep the crystal at a specific "turning point" temperature (usually around 75°C to 85°C) where frequency drift is minimal. #### C. The Oscillator Circuitry This includes capacitors, inductors, and an integrated circuit (IC) that maintains the oscillation of the crystal. It ensures the signal is clean and matches the 27.000 MHz target. #### D. Voltage Regulator & Buffer * **LDO (Low Dropout Regulator):** Ensures the internal heating and oscillation circuits receive stable power, protecting the signal from external noise. * **Output Buffer:** A high-speed CMOS inverter that shapes the sine wave into a clean square wave for digital circuits. --- ### 3. Part Number Decoder (MHO+ Series) | Segment | Meaning | | :--- | :--- | | **MHO+** | Product Series (High Stability OCXO/VCXO) | | **27** | Center Frequency (27.000 MHz) | | **T** | Through-hole (DIP) or specific Temperature characteristic | | **G** | Stability Grade (often refers to ±ppb or ±ppm) | | **D** | Supply Voltage (usually 3.3V or 5.0V) | | **-R** | RoHS Compliant (Lead-free) | --- ### 4. Applications The MHO+27TGD-R is used in environments where timing precision is critical and cannot be maintained by standard oscillators: * **Telecommunications:** Base stations and synchronization. * **GPS/GNSS:** High-precision positioning equipment. * **Test & Measurement:** Oscilloscopes and frequency counters. * **Broadcasting:** Video/Audio sync signals. ---