The **M3A15FCG-R** is a high-performance, differential crystal oscillator (XO) manufactured by **MtronPTI**. It is designed specifically for high-speed data applications and telecommunications where low jitter and high stability are critical. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Supply Voltage ($V_{dd}$)** | 3.3V (standard) | | **Package Size** | 5.0 x 7.0 mm (6-pad SMD) | | **Frequency Stability** | ±20ppm to ±100ppm (variant dependent) | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Phase Jitter** | < 1 ps RMS (typical) | | **Enable/Disable Function** | Included on Pad 1 | --- ### 2. Functional Components The "M3A" series is built using several internal electronic stages to ensure signal integrity: 1. **Crystal Resonator:** A high-precision AT-cut quartz crystal serves as the mechanical frequency source. 2. **Oscillator IC:** A specialized integrated circuit that maintains the oscillation and provides the differential output drivers. 3. **LVPECL Driver:** This stage creates a differential signal (complementary outputs), which minimizes electromagnetic interference (EMI) and provides excellent noise immunity over long PCB traces. 4. **Tri-state Buffer:** Allows the output to be placed in a high-impedance state, useful for testing or power-saving modes. --- ### 3. Pin Configuration For integration onto a PCB, the 6-pad layout is standardized: | Pad # | Function | Description | | :--- | :--- | :--- | | **1** | E/D (Enable/Disable) | Logic '1' or open enables output; Logic '0' disables. | | **2** | N/C | No internal connection. | | **3** | Case Ground | Connected to the metal lid for EMI shielding. | | **4** | Output | The primary LVPECL signal. | | **5** | Complementary Output | The inverted LVPECL signal. | | **6** | Supply Voltage ($V_{dd}$) | Input power. | --- ### 4. Applications Due to its **LVPECL** output and low-jitter profile, this part is commonly found in: * **Fibre Channel & Ethernet:** 10G/40G/100G networking equipment. * **SONET/SDH:** High-speed optical transport networks. * **Storage Area Networks (SAN):** High-speed data transfer between servers and storage. * **FPGA Clocking:** Providing stable reference clocks for high-end Xilinx or Altera FPGAs.