The **PL502-39OC-R** is a high-performance, low-phase noise **Voltage Controlled Crystal Oscillator (VCXO)** IC designed by Microchip Technology (formerly PhaseLink). It is specifically engineered to work with high-frequency fundamental crystals to provide a clean clock signal for networking and communication systems. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the PL502-39OC-R: | Feature | Specification | | :--- | :--- | | **Part Number** | PL502-39OC-R | | **Type** | VCXO (Voltage Controlled Crystal Oscillator) | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Frequency Range** | 600kHz to 800MHz (Supports high-freq fundamental) | | **Operating Voltage** | 2.5V or 3.3V | | **Package Type** | TSSOP-16 (8-pin equivalent functionality in many variants) | | **Pulling Range** | ±100 ppm to ±200 ppm (Typical) | | **Temperature Range** | 0°C to +70°C (Commercial Grade) | --- ### 2. Functional Core Components The device consists of several critical internal electronic blocks: 1. **Crystal Oscillator Circuit:** Designed to interface with a "High Frequency Fundamental" (HFF) crystal. This minimizes jitter compared to using a standard crystal with a PLL multiplier. 2. **Voltage Control (VC) Input:** An analog input pin that allows the user to adjust (pull) the output frequency by changing the input voltage. This is essential for Phase-Locked Loop (PLL) applications. 3. **LVPECL Output Driver:** Provides a high-speed, differential output signal. LVPECL is preferred in high-speed applications because of its excellent noise immunity and fast transition times. 4. **Phase Noise Reduction:** The internal architecture is optimized for sub-picosecond RMS jitter, making it suitable for 10GbE or Fibre Channel applications. --- ### 3. Pinout Description (Common 16-pin TSSOP) | Pin Name | Function | Description | | :--- | :--- | :--- | | **VIN** | Voltage Control | Input for frequency tuning. | | **XIN / XOUT** | Crystal Input | Connection points for the external Quartz crystal. | | **VDD** | Power Supply | Power input (2.5V or 3.3V). | | **OUTP / OUTN** | Differential Output | The LVPECL clock signal outputs. | | **OE** | Output Enable | Logic high enables the output; logic low sets it to high-Z. | | **GND** | Ground | Reference ground. | --- ### 4. Application Use-Cases * **Networking:** Used in Gigabit Ethernet switches and routers to maintain precise synchronization. * **Telecommunications:** SONET/SDH optical modules where low jitter is mandatory. * **Set-Top Boxes:** Providing clock references for high-definition video processing.