The **MHO+27TFG-R** is a high-precision, high-frequency **VCXO (Voltage Controlled Crystal Oscillator)** typically manufactured by specialized frequency control companies like Mercury Electronic. This component is designed for applications requiring tight frequency stability and the ability to fine-tune the output frequency via an external control voltage. --- ### 1. Technical Specifications Below are the primary electrical characteristics for the MHO series (specifically the 27TFG-R variant): | Feature | Specification | | :--- | :--- | | **Output Type** | HCMOS / TTL Compatible | | **Supply Voltage (Vcc)** | Typically +3.3V or +5.0V (Variant dependent) | | **Frequency Stability** | ±25ppm to ±50ppm (standard range) | | **Pulling Range** | ±100ppm (Minimum) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Type** | DIP-14 (Full size) or DIP-8 (Half size) Metal Can | | **RoHS Status** | Compliant (Indicated by "-R") | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **MHO:** Series designation for Mercury High Output/Metal Hybrid Oscillators. * **27:** Often refers to the specific frequency or a physical dimension code (27.000 MHz is a common base for this series). * **TFG:** Coding for specific stability, temperature range, and duty cycle requirements. * **-R:** Indicates **RoHS Compliance** (Lead-free). --- ### 3. Pin Configuration For a standard 14-pin DIP VCXO package (where only 4 pins are usually present), the layout is typically: | Pin Number | Function | Description | | :---: | :--- | :--- | | **1** | **V_control** | Control Voltage to adjust the frequency (Pulling). | | **7** | **GND** | Case ground and circuit supply return. | | **8** | **Output** | The generated clock signal (Square Wave). | | **14** | **Vcc** | Power supply input. | --- ### 4. Key Applications Because this is a **VCXO**, it is primarily used in circuits where the frequency needs to be synchronized or "locked" to another signal: 1. **Phase-Locked Loops (PLL):** Used as the local oscillator to sync with incoming data streams. 2. **Telecommunications:** Base stations and networking hardware (SONET/SDH). 3. **Video Equipment:** Digital video broadcast (DVB) for frame synchronization. 4. **Frequency Synthesis:** Generating precise clock signals for high-speed microprocessors. ---