The **VCXO2EV-C10T3** is a specific model of a Voltage Controlled Crystal Oscillator (VCXO). These components are critical in telecommunications and high-precision timing applications where the output frequency needs to be fine-tuned via an external control voltage. --- ### 1. Key Technical Specifications The part number typically breaks down into several functional characteristics. While exact datasheet values can vary by manufacturer (often associated with brands like Daishinku/KDS or Vectron), the "C10T3" series generally adheres to the following profile: | Feature | Specification | Description | | :--- | :--- | :--- | | **Component Type** | VCXO | Voltage Controlled Crystal Oscillator | | **Output Type** | CMOS / HCMOS | Standard logic level output for digital circuits | | **Supply Voltage ($V_{dd}$)** | 3.3V (Typical) | Standard low-voltage operation | | **Frequency Range** | 1MHz to 54MHz | Common range for the "C10" series | | **Control Voltage ($V_c$)** | 1.65V ± 1.5V | The range used to "pull" the frequency | | **Pullability** | ±50 ppm to ±100 ppm | How much the frequency can be adjusted | | **Package Size** | 2.5 x 2.0 mm | Ultra-miniature SMD footprint | --- ### 2. Functional Electronic Sections A VCXO consists of three primary internal sub-blocks: #### A. The Quartz Crystal The heart of the device. It provides a stable base frequency through mechanical resonance. In a VCXO, the crystal is designed to be "pullable," meaning its resonant frequency can be slightly shifted. #### B. Varactor Diode (The "Voltage Control" Part) This is an internal electronic capacitor whose capacitance changes based on the voltage applied to the Control Voltage pin ($V_c$). By changing the capacitance in the oscillation loop, the device forces the crystal to vibrate slightly faster or slower. #### C. Output Buffer (CMOS) The internal oscillator signal is weak and sinusoidal. The CMOS buffer converts this into a clean square wave (0V to 3.3V) capable of driving other digital components like FPGAs or Microcontrollers. --- ### 3. Pinout Configuration Typically, this 2.5 x 2.0 mm package uses a 4-pin or 6-pin configuration: 1. **Pin 1 ($V_c$):** Control Voltage input. Adjusts the frequency. 2. **Pin 2 (OE):** Output Enable (Optional). High = Active; Low = High Impedance. 3. **Pin 3 (GND):** Ground connection. 4. **Pin 4 (Output):** The clock signal output. 5. **Pin 6 ($V_{dd}$):** Power supply (3.3V). --- ### 4. Typical Applications * **Phase-Locked Loops (PLL):** Used to synchronize local clocks with a reference signal. * **Jitter Attenuation:** Cleaning up noisy clock signals in networking gear. * **Set-Top Boxes & Video:** Synchronizing audio/video bitstreams. * **Wireless Infrastructure:** Base stations requiring precise frequency tuning to match network standards.