The **PL580-38OCL-R** is a high-performance, low-phase-noise **VCXO (Voltage Controlled Crystal Oscillator)** IC produced by Microchip (formerly PhaseLink). It is specifically designed for high-frequency synthesis and clock distribution in telecommunications and networking hardware. --- ### 1. Key Technical Specifications | Parameter | Specification | |:--- |:--- | | **Component Type** | VCXO (Voltage Controlled Crystal Oscillator) | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Input Frequency Range** | 19 MHz to 40 MHz (Crystal Input) | | **Output Frequency Range** | 19 MHz to 850 MHz (via Frequency Multiplier) | | **Supply Voltage (Vcc)** | 2.5V or 3.3V | | **Package Type** | SOP-16 (150 mil width) | | **Operating Temp** | 0°C to +70°C (Commercial Grade) | --- ### 2. Core Functional Blocks The device integrates several critical electronic sections into a single chip: 1. **Crystal Oscillator Interface:** Designed to work with a fundamental parallel resonant crystal. It includes an integrated varactor for frequency tuning. 2. **Phase-Locked Loop (PLL):** A low-noise analog PLL that multiplies the crystal frequency to the desired high-speed output. 3. **VCXO Control:** A high-linearity voltage control pin ($V_{CON}$) that allows for frequency pulling (typically ±100 ppm), essential for clock synchronization. 4. **LVPECL Output Driver:** Provides differential outputs that ensure high-speed signal integrity and low electromagnetic interference (EMI). --- ### 3. Pin Configuration (Common SOP-16) | Pin Name | Function | Description | |:--- |:--- |:--- | | **$V_{CON}$** | Control Voltage | Analog input to adjust the oscillator frequency. | | **XIN / XOUT** | Crystal Pins | Connection for the external quartz crystal. | | **CLK / $\overline{CLK}$** | Differential Outputs | The high-frequency LVPECL clock outputs. | | **OE** | Output Enable | Logic high to enable outputs; logic low to tri-state. | | **VDD / VSS** | Power / Ground | Power supply and reference ground. | --- ### 4. Circuit Implementation Example To use the PL580-38OCL-R, the following basic configuration is required: ```c // Typical Connection Logic [Crystal] <--> [XIN/XOUT Pins] [Control Voltage 0-3.3V] --> [VCON Pin] [Pull-up Resistors] --> [OE Pin] [LVPECL Termination (50 ohms to VDD-2V)] <--> [CLK/nCLK] ``` ### 5. Application Areas * **Networking:** SONET/SDH, Gigabit Ethernet, and Fiber Channel. * **Telecommunications:** Base stations and wireless infrastructure. * **Video:** Professional broadcast video equipment requiring low jitter. * **Clock Recovery:** Used in circuits where a clock must be "locked" to an incoming data stream via the $V_{CON}$ pin. ---