The **MV28T2CD-R** is a specific electronic component, typically categorized as a **Precision Temperature-Compensated Crystal Oscillator (TCXO)** or a specialized **Oven-Controlled Crystal Oscillator (OCXO)**, often produced by manufacturers like **CTS Electronic Components** (Valpey Fisher division). These parts are designed for high-stability frequency control in telecommunications and networking equipment. --- ### 1. General Specifications Based on the standard nomenclature for this series, here are the technical characteristics: | Parameter | Typical Value / Description | | :--- | :--- | | **Component Type** | Crystal Oscillator (TCXO/OCXO) | | **Package Type** | Through-hole (DIP) or Surface Mount (SMD) | | **Frequency Stability** | Extremely high (often in the ±0.1 ppm to ±1.0 ppm range) | | **Supply Voltage** | Typically 3.3V or 5.0V DC | | **Output Type** | CMOS / HCMOS or Clipped Sine Wave | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | --- ### 2. Key Internal Components The "Electronic Parts" within this module include: * **Quartz Crystal:** The heart of the unit, precision-cut to vibrate at a specific resonant frequency. * **Varactor Diode:** Used for frequency tuning. By changing the voltage, the capacitance of the diode changes, shifting the crystal's frequency slightly. * **Compensation Network:** A thermistor-based circuit or a digital ASIC that senses ambient temperature and applies a corrective voltage to the crystal to prevent frequency drift. * **Buffer/Output Amplifier:** An integrated circuit that isolates the crystal oscillator from the external load to ensure a clean square or sine wave signal. --- ### 3. Pinout Configuration (Common) While you should always consult the specific datasheet for the "R" revision, the standard configuration for this series is: 1. **Pin 1 (V_control):** Voltage control for frequency fine-tuning (Electronic Frequency Control). 2. **Pin 7 (GND):** Case ground and negative supply. 3. **Pin 8 (Output):** The generated frequency signal. 4. **Pin 14 (Vcc):** Positive supply voltage. --- ### 4. Typical Applications The MV28T2CD-R is found in infrastructure-grade hardware where timing is critical: * **Base Stations:** Synchronizing cellular signals (4G/5G). * **SONET/SDH:** High-speed fiber optic networking. * **Stratum 3/3E:** Providing "holdover" stability if the primary clock source is lost. * **Test & Measurement:** Used as a reference clock in laboratory equipment. --- ### 5. Part Number Breakdown (Logic) * **MV:** Series designation (often indicating Medium Voltage or specific Valpey Fisher line). * **28:** Package size/form factor code. * **T:** Temperature compensation type. * **2:** Voltage code (e.g., 5.0V). * **CD:** Frequency stability and temperature range code. * **-R:** RoHS Compliant (Lead-free).