The **MHO374FAG-R** is a high-performance **Crystal Oscillator** (specifically a VCXO - Voltage Controlled Crystal Oscillator) manufactured by MtronPTI. These components are critical for frequency control and timing in telecommunications and high-speed data networking. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | VCXO (Voltage Controlled Crystal Oscillator) | | **Package Type** | 6-pin Leadless Ceramic (SMD) | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Supply Voltage** | +3.3V DC (Typical) | | **Frequency Range** | Typically used for high frequencies (e.g., 100MHz to 800MHz+) | | **Operating Temperature** | Commercial or Industrial grades (typically -40°C to +85°C) | | **Phase Jitter** | Ultra-low (sub-picosecond levels) | --- ### 2. Functional Breakdown of Parts #### A. The Oscillator Core The "MHO" series utilizes a high-precision quartz crystal resonator. Because it is a **VCXO**, the output frequency can be "pulled" or adjusted slightly by changing a control voltage applied to one of the pins. This is essential for Phase Locked Loops (PLL) and synchronization. #### B. LVPECL Output Stage The **FAG** designation in the part number often refers to the specific output logic level. **LVPECL** is chosen for: * High-speed data transmission. * Excellent noise immunity. * The ability to drive long transmission lines in backplanes. #### C. Stability and Jitter The "R" suffix typically denotes compliance with **RoHS** (Restriction of Hazardous Substances) standards. The internal circuitry is designed to minimize phase noise, making it suitable for jitter-sensitive applications like 10G/40G/100G Ethernet. --- ### 3. Pin Configuration (Typical 6-Pin SMD) | Pin # | Function | Description | | :--- | :--- | :--- | | 1 | **V_control** | Control Voltage to adjust frequency. | | 2 | **Enable/Disable** | Logic input to turn the output on or off. | | 3 | **GND** | Ground connection. | | 4 | **Output** | Positive output signal. | | 5 | **Output (Comp)** | Complementary (negative) output signal. | | 6 | **Vcc** | Supply voltage (+3.3V). | --- ### 4. Common Applications * **Networking:** Fiber Channel, Gigabit Ethernet, and SONET/SDH. * **Instrumentation:** High-speed data acquisition and test equipment. * **Broadcasting:** Video distribution systems and digital radio. ---