The **VCXO2EV-T12.288T3** is a high-performance Voltage Controlled Crystal Oscillator (VCXO). These components are essential in telecommunications and digital audio/video applications where a precise frequency needs to be adjusted or synchronized via an external analog voltage. --- ### 1. Component Overview The part number can be broken down into its core functional characteristics: | Parameter | Specification | | :--- | :--- | | **Component Type** | VCXO (Voltage Controlled Crystal Oscillator) | | **Nominal Frequency** | 12.288 MHz | | **Control Voltage Range** | Typically 0.5V to 2.5V or 0V to 3.3V (varies by sub-series) | | **Output Type** | CMOS / HCMOS | | **Package Size** | Typically 5.0 x 3.2 mm or 7.0 x 5.0 mm SMD | ### 2. Key Electronic Features * **Frequency (12.288 MHz):** This is a "magic frequency" commonly used in professional audio systems. It is exactly $256 \times 48 \text{ kHz}$, making it the standard master clock for high-fidelity audio sampling. * **Voltage Control (V_c):** Unlike a standard fixed oscillator, this part has a dedicated pin for an analog input. Changing this voltage slightly shifts the output frequency (Pulling Range). * **Pulling Range:** Usually specified in parts per million (ppm), typically $\pm 50$ to $\pm 100 \text{ ppm}$. This allows the system to "lock" onto an external reference clock. * **Low Phase Noise:** Designed to minimize jitter, ensuring that the timing of digital signals remains extremely stable. --- ### 3. Pin Configuration (Typical 6-Pad SMD) Standard VCXOs in this series generally follow this pinout structure: | Pin # | Function | Description | | :--- | :--- | :--- | | **1** | **V_c** | Control Voltage (Frequency Tuning) | | **2** | **E/D** | Enable/Disable (Tristate function) | | **3** | **GND** | Ground | | **4** | **Output** | 12.288 MHz RF Output signal | | **5** | **NC** | No Connection | | **6** | **Vdd** | Power Supply (usually 3.3V or 5.0V) | --- ### 4. Common Applications 1. **Phase-Locked Loops (PLL):** Used as the adjustable element to synchronize internal clocks with external data streams. 2. **Digital Audio (DAC/ADC):** Providing the master clock for audio interfaces to prevent "clicks and pops" during playback. 3. **Broadcasting:** Synchronizing video frames across different hardware units. ---