The **PL500-37TI-R** is a specialized electronic component produced by Microchip Technology (originally PhaseLink). It is a high-performance **VCXO (Voltage Controlled Crystal Oscillator) IC** designed to work with fundamental parallel resonant crystals. --- ## 1. Core Specifications and Functions | Feature | Specification | | :--- | :--- | | **Component Type** | VCXO IC (Phase-Locked Loop / Oscillator) | | **Input Frequency** | 17MHz to 36MHz (Fundamental Mode Crystal) | | **Output Frequency** | Same as Input Frequency | | **Operating Voltage** | 2.25V to 3.63V | | **Output Type** | CMOS / TTL | | **Package Type** | SOT-23 (6-pin) | | **Temperature Range** | Industrial (-40°C to +85°C) | --- ## 2. Key Electronic Characteristics ### A. VCXO Functionality The "VC" stands for Voltage Control. This chip allows the output frequency to be adjusted or "pulled" by applying a control voltage to the **VIN** pin. This is essential for applications where the clock must be synchronized with an external reference signal. ### B. Low Phase Noise & Jitter The PL500-37 series is engineered for low-phase noise, making it suitable for high-speed data transmission and sensitive audio/video applications where timing precision is critical. ### C. "Pullability" Range This IC is designed to provide a wide frequency pulling range (typically ±100ppm to ±200ppm, depending on the crystal used). This ensures the system can account for crystal aging and temperature drift. --- ## 3. Pinout Description | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **VIN** | Voltage Control Input (Adjusts frequency) | | 2 | **GND** | Ground Connection | | 3 | **XIN** | Crystal Input (Connect to crystal) | | 4 | **XOUT** | Crystal Output (Connect to crystal) | | 5 | **VDD** | Power Supply (2.25V - 3.63V) | | 6 | **CLKOUT** | CMOS Clock Output | --- ## 4. Part Number Breakdown: `PL500-37TI-R` * **PL500-37**: Base part number for the Low Power VCXO family. * **T**: Package type (SOT-23). * **I**: Temperature rating (Industrial: -40°C to +85°C). * **-R**: Tape and Reel packaging (standard for automated assembly). --- ## 5. Typical Applications * **Set-Top Boxes:** Synchronizing audio/video clocks. * **ADSL/VDSL Modems:** Managing data clocking. * **Instrumentation:** Precision timing in measurement tools. * **Clock Recovery:** Used in circuits where a clock must be extracted from a data stream.