The **PLL500-17TC-R** is a high-performance Low Phase Noise VCXO (Voltage Controlled Crystal Oscillator) IC, specifically designed to provide a low-cost, high-frequency clock source for telecommunications and networking applications. --- ### ## Technical Specifications Overview | Parameter | Specification | | :--- | :--- | | **Part Number** | PLL500-17TC-R | | **Manufacturer** | Microchip Technology (formerly PhaseLink/Micrel) | | **Input Frequency** | 17MHz to 36MHz (Crystal) | | **Output Frequency** | Up to 130MHz (typically) | | **Supply Voltage (Vcc)** | 3.3V ± 10% | | **Package Type** | SOT-23 (6-pin) | | **Operating Temperature** | 0°C to +70°C (Commercial Grade) | | **Packaging** | Tape & Reel (indicated by the "-R") | --- ### ## Functional Description The device integrates a specialized Phase Locked Loop (PLL) and a Voltage Control pin (V_C) to allow for frequency tuning. 1. **VCXO Functionality:** It converts a low-frequency crystal input into a high-frequency CMOS output. The output frequency can be "pulled" or adjusted slightly by changing the voltage on the control pin. 2. **Low Phase Noise:** It is engineered to minimize jitter, making it suitable for timing-sensitive circuits like ADSL, Set-top boxes, and Gigabit Ethernet. 3. **Frequency Multiplier:** It uses an internal PLL to multiply the base crystal frequency to the desired high-speed output. --- ### ## Pin Configuration (SOT-23-6) | Pin # | Name | Description | | :--- | :--- | :--- | | 1 | **VC** | Voltage Control input (controls the output frequency) | | 2 | **GND** | Ground connection | | 3 | **XIN** | Crystal input or reference clock input | | 4 | **XOUT** | Crystal output (leave floating if using external clock) | | 5 | **VDD** | 3.3V Power Supply | | 6 | **CLKOUT** | CMOS Clock Output | --- ### ## Key Applications * **Networking:** Synchronous Ethernet, Fiber Channel, and SONET. * **Consumer Electronics:** HDTV, DVD players, and high-end audio DACs. * **Instrumentation:** Low-jitter clock generation for measurement tools. ---