The **PL580-38OC-R** is a high-performance Phase Locked Loop (PLL) based clock generator chip, primarily designed for low-jitter applications. It is manufactured by Microchip (formerly PhaseLink/Micrel). --- ### ## Technical Specifications Below are the primary technical parameters of the PL580-38OC-R: | Parameter | Specification | | :--- | :--- | | **Type** | VCXO / PLL Clock Generator | | **Input Frequency** | 17MHz to 36MHz (Crystal or Reference) | | **Output Frequency** | Up to 800MHz (Depends on Multiplier) | | **Output Type** | LVPECL (Differential) | | **Supply Voltage** | 2.97V to 3.63V (3.3V Nominal) | | **Jitter Performance** | < 0.5ps RMS (Integration Range 12kHz - 20MHz) | | **Package** | SOP-16 (Standard Outline Package) | | **Operating Temp** | 0°C to +70°C (Commercial Grade) | --- ### ## Key Features and Architecture 1. **PLL Multiplier:** It uses a high-frequency analog PLL to multiply a standard crystal frequency to high-speed clock rates required by modern data systems. 2. **LVPECL Output:** Low-Voltage Positive Emitter-Coupled Logic (LVPECL) is used to ensure signal integrity over high frequencies and long traces, providing excellent noise immunity. 3. **Phase Noise:** The "38" series is specifically optimized for very low phase noise, making it suitable for high-speed Ethernet (1GbE/10GbE), SONET, and Fibre Channel. 4. **Voltage Control (VCXO):** The "V" in the series indicates it can function as a Voltage Controlled Crystal Oscillator, allowing fine-tuning of the output frequency via an analog control voltage. ### ## Part Number Breakdown Understanding the suffix helps in identifying the exact variant: * **PL580:** Product Series (Low Jitter PLL). * **-38:** Specific configuration code (Multiplier/Performance curve). * **O:** Package code (SOP/SOIC). * **C:** Temperature grade (Commercial: 0°C to 70°C). * **-R:** Packing method (Tape and Reel). --- ### ## Typical Application Circuit The chip is typically integrated into a PCB using the following connectivity logic: ```c // Simplified Pin Connection Logic 1. VDD/VSS -> 3.3V Power and Ground Plane 2. XIN/XOUT -> 25MHz Quartz Crystal 3. VC -> Control Voltage (if using VCXO mode) 4. OUTP/OUTN -> Differential LVPECL Output to FPGA/ASIC 5. SEL Pins -> Logic High/Low to set Frequency Multiplier ```