The **MV25T3CG-R** is a high-performance, ultra-stable **Temperature Compensated Crystal Oscillator (TCXO)** manufactured by **Microchip Technology** (formerly under the Vectron brand). It is specifically designed for telecommunications and networking applications where precise timing is critical. --- ## 1. Technical Specifications The following table summarizes the primary electronic characteristics of the MV25T3CG-R: | Parameter | Specification | | :--- | :--- | | **Output Frequency** | 25.000 MHz | | **Supply Voltage (Vcc)** | 3.3 VDC | | **Output Type** | CMOS | | **Frequency Stability** | ±0.28 ppm (Over Temperature) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Package Size** | 5.0 x 3.2 mm (SMD) | | **Current Consumption** | ~6 mA (Typical) | --- ## 2. Core Electronic Components & Architecture The MV25T3CG-R is an integrated module consisting of three main electronic sub-sections: ### A. The Quartz Crystal Resonator * **Function:** Acts as the primary frequency reference. * **Characteristics:** High-Q factor quartz cut to vibrate at exactly 25 MHz. ### B. Temperature Compensation Circuit (Analog/Digital) * **Function:** Corrects the frequency drift caused by ambient temperature changes. * **Mechanism:** It utilizes a thermistor-based network or a digital compensation ASIC that adjusts the load capacitance of the crystal to "pull" the frequency back to its nominal value. ### C. Output Buffer (CMOS) * **Function:** Drives the signal to the rest of the PCB. * **Logic Levels:** Provides a rail-to-rail square wave (0V to 3.3V) compatible with standard FPGA and MCU clock inputs. --- ## 3. Key Features * **Stratum 3 Compliance:** Meets the stringent requirements for Stratum 3 timing, ensuring minimal "wander" in network synchronization. * **Low Phase Noise:** Optimized to reduce jitter, making it suitable for high-speed data transmission. * **Voltage Control (Optional):** Some variants in this series allow for fine-tuning the frequency via an external voltage pin (VCTCXO). --- ## 4. Pin Configuration (Typical 4-6 Pin Layout) | Pin # | Function | Description | | :--- | :--- | :--- | | **1** | NC or Vc | No Connect or Control Voltage (for VCTCXO) | | **2** | GND | Ground Connection | | **3** | Output | 25 MHz CMOS Signal | | **4** | Vdd | +3.3V Power Supply | ---