The **VOS2T-R-21L0** is a high-precision, industrial-grade **Quartz Crystal Oscillator**. Specifically, it belongs to the category of **VCTCXO** (Voltage Controlled Temperature Compensated Crystal Oscillator). These components are critical for providing a stable frequency reference in telecommunications and RF systems. --- ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Component Type** | VCTCXO (Voltage Controlled Temperature Compensated Crystal Oscillator) | | **Output Frequency** | Typically 10.000 MHz to 52.000 MHz (Model specific) | | **Frequency Stability** | ±0.5 ppm to ±2.0 ppm (vs. Temperature) | | **Supply Voltage** | 3.3V (standard for the "21L0" series) | | **Output Type** | Clipped Sine Wave or CMOS | | **Package Size** | 2.0 x 1.6 mm or 2.5 x 2.0 mm (SMD Package) | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | --- ### 2. Internal Electronic Structure The "VOS2" series integrates several electronic stages within its miniature ceramic package: * **Quartz Crystal Resonator:** The heart of the part, providing the base mechanical vibration. * **Compensation Circuit:** Uses a thermistor or a digital compensation network to adjust the frequency as temperature changes, preventing "drift." * **Voltage Control (VC) Pin:** Allows the user to fine-tune the output frequency by applying a small DC voltage. * **Buffer Amplifier:** Ensures the output signal is strong enough to drive the next stage in the circuit (e.g., a Phase Locked Loop or MCU). --- ### 3. Pinout Configuration Most SMD oscillators in this series follow a standard 4-pin or 6-pin layout: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **V_cont / NC** | Control Voltage (for frequency tuning) or No Connect | | **2** | **GND** | Ground connection | | **3** | **Output** | Frequency output signal | | **4** | **Vcc** | Supply Voltage (Power) | --- ### 4. Common Applications Due to its high stability and small footprint, the VOS2T-R-21L0 is found in: 1. **GNSS/GPS Modules:** Used for precise timing to lock onto satellites. 2. **Wireless Modules:** Wi-Fi, Bluetooth, and LTE systems that require tight frequency tolerances. 3. **IoT Devices:** Battery-powered sensors that need low-power but stable clock sources. ---