The part number **I630-31BC9O2-155.520** refers to a high-precision **Voltage Controlled Crystal Oscillator (VCXO)**, typically manufactured by companies like ILSI (now part of Abracon) or similar frequency control specialists. --- ### 1. Part Number Breakdown Based on standard industry nomenclature for this series, here is the technical breakdown: | Component Segment | Description | Specific Detail | |:---|:---|:---| | **I630** | Series Model | Low Jitter / Low Phase Noise VCXO | | **31** | Operating Voltage | 3.3V DC Supply | | **B** | Operating Temp | -20°C to +70°C (Standard Industrial) | | **C** | Frequency Stability | ±50 ppm (Typical) | | **9** | Pullability | ±100 ppm Min (Tuning Range) | | **O2** | Output Type | LVPECL (Differential Output) | | **155.520** | Nominal Frequency | 155.520 MHz | --- ### 2. Technical Specifications This component is designed for high-speed telecommunications and data transfer. * **Frequency (155.520 MHz):** This is a standard networking frequency, specifically used for **SONET/SDH (OC-3)** systems. * **Output Logic (LVPECL):** Low-Voltage Positive Emitter-Coupled Logic. This provides a differential signal which is excellent for rejecting electromagnetic interference (EMI) and maintaining signal integrity over long PCB traces. * **VCXO Functionality:** Unlike a standard clock, a VCXO allows the output frequency to be "steered" or adjusted slightly using a control voltage pin. This is essential for Phase-Locked Loops (PLLs) and frequency synchronization. --- ### 3. Common Applications Due to its high frequency and low jitter characteristics, this part is found in: 1. **Optical Networking:** SONET/SDH, Gigabit Ethernet, and Fiber Channel. 2. **Telecommunications:** Base stations and backhaul equipment. 3. **Data Centers:** High-speed switches and routers. 4. **Clock Recovery:** Used in circuits that need to "lock onto" an incoming data stream's timing. --- ### 4. Implementation Example (Schematic Logic) To use this part, a designer typically implements the following connections: ```markdown Pin 1: VC (Voltage Control) -> Connects to a DAC or PLL Error Signal Pin 2: OE (Output Enable) -> High for Active, Low for High-Z Pin 3: GND -> System Ground Pin 4: Output -> Differential (+) to Receiver Pin 5: Complementary Out -> Differential (-) to Receiver Pin 6: VDD -> +3.3V Supply ```