The **PLL520-05OC-R** is a high-performance Phase-Locked Loop (PLL) clock synthesizer Integrated Circuit (IC). It is specifically designed for high-speed clock generation and frequency translation in networking and storage applications. --- ### 1. Key Technical Specifications | Parameter | Specification | |:--- |:--- | | **Manufacturer** | PhaseLink (Acquired by Micrel / Microchip) | | **Type** | VCXO (Voltage Controlled Crystal Oscillator) / Clock Generator | | **Input Frequency Range** | 10 MHz to 30 MHz (Typically uses 27MHz for video) | | **Output Frequency Range** | Up to 150 MHz | | **Output Type** | CMOS / TTL | | **Supply Voltage (VDD)** | 3.3V ± 10% | | **Package Type** | SOIC-8 | | **Operating Temperature** | 0°C to +70°C (Commercial Grade) | --- ### 2. Functional Description The device integrates several electronic components into a single silicon die to manage timing signals: * **Phase Frequency Detector (PFD):** Compares the phase of the input clock (or crystal) with the feedback signal. * **Voltage Controlled Oscillator (VCO):** Generates the internal high-frequency signal. * **Charge Pump & Loop Filter:** Converts phase differences into a control voltage for the VCO. * **Frequency Multiplier:** Provides a fixed or selectable multiplication ratio to generate a high-speed output from a low-speed reference. --- ### 3. Features and Benefits * **Low Jitter:** Designed to meet the stringent timing requirements of high-speed data transmission. * **Pullability:** As a VCXO-based part, it allows for fine-tuning of the output frequency via an external control voltage ($V_{CTRL}$). * **Integration:** Replaces complex discrete oscillator circuits, reducing PCB footprint. * **Power Management:** Optimized for low power consumption in 3.3V systems. --- ### 4. Typical Applications The PLL520-05OC-R is commonly found in electronic systems requiring precise timing: 1. **Set-Top Boxes:** Generating system clocks for video processing. 2. **Network Switches/Routers:** Providing reference clocks for Ethernet PHYs. 3. **Digital Video:** Used in MPEG encoders/decoders where frequency synchronization is critical. 4. **ADSL/Cable Modems:** Managing data clocking rates. --- ### 5. Pin Configuration (SOIC-8) | Pin # | Symbol | Description | |:--- |:--- |:--- | | 1 | XIN / CLK | Crystal or Reference Clock Input | | 2 | VDD | Positive Power Supply (3.3V) | | 3 | GND | Ground | | 4 | VCON | Control Voltage for VCXO | | 5 | CLKOUT | Main Clock Output | | 6-8 | NC/Other | Non-connected or Factory test pins (See datasheet) |