The **VCXO2EV-C25.6T3** is a high-precision electronic component categorized as a **Voltage-Controlled Crystal Oscillator (VCXO)**. These components are essential in applications where a specific frequency needs to be maintained or finely adjusted via an external control voltage. --- ### 1. Technical Specifications Table | Feature | Specification Details | | :--- | :--- | | **Component Type** | Voltage-Controlled Crystal Oscillator (VCXO) | | **Center Frequency** | 25.6 MHz | | **Control Voltage** | Typically 0.5V to 2.5V (Standard range) | | **Output Type** | CMOS / HCMOS | | **Supply Voltage (Vcc)** | 3.3V (Typical for 'V' series) | | **Stability** | Generally ±20ppm to ±50ppm (varies by sub-grade) | | **Package Style** | SMD (Surface Mount Device) | --- ### 2. Breakdown of the Model Code * **VCXO**: Indicates the core technology. Unlike a standard crystal, the output frequency can be "pulled" or tuned by changing the input voltage. * **2EV**: Usually refers to the specific package size (often 2.5 x 2.0 mm or 3.2 x 2.5 mm) and the operating voltage characteristics. * **C**: Represents the output logic type, in this case, **CMOS**. * **25.6**: The fundamental operating frequency in Megahertz (**25.6 MHz**). * **T3**: Indicates the packaging format, typically **Tape and Reel** (3,000 pieces per reel) for automated assembly. --- ### 3. Key Electronic Functions #### A. Frequency Tuning (The "VC" Aspect) The "Voltage Control" pin allows a circuit to make micro-adjustments to the 25.6 MHz signal. This is critical for **Phase-Locked Loops (PLL)** where the oscillator must sync perfectly with an external reference signal. #### B. Frequency Stability Because it uses a quartz crystal as its base, it offers much higher stability than an RC or LC oscillator circuit, while still providing the flexibility of frequency adjustment. #### C. Typical Applications * **Telecommunications**: Used in base stations and networking hardware to maintain timing synchronization. * **Digital Video**: Used in broadcast equipment to lock onto video subcarriers. * **Phase-Locked Loops (PLLs)**: Serving as the local oscillator in frequency synthesizer circuits. * **GPS/GNSS**: Frequency referencing for positioning systems. --- ### 4. Typical Pin Configuration (Standard 4 or 6-Pin SMD) 1. **Pin 1 (VC):** Voltage Control input (adjusts the frequency). 2. **Pin 2 (GND):** Ground connection. 3. **Pin 3 (Output):** The 25.6 MHz CMOS signal output. 4. **Pin 4 (Vcc):** DC Power Supply (3.3V).