The **MHO+13FGD-R** is a high-performance, differential output crystal oscillator manufactured by **Mercury Electronic**. It is specifically designed for high-frequency applications that require low jitter and high stability. --- ## 1. Technical Specifications The part number follows a specific nomenclature used by Mercury. Below are the primary technical characteristics: | Feature | Specification | | :--- | :--- | | **Output Type** | LVPECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Package Size** | 7.0 x 5.0 mm (SMD 6-pad) | | **Supply Voltage** | +3.3V DC (Standard for the '3' designation) | | **Frequency Stability** | ±50 ppm or ±25 ppm (depending on specific sub-grade) | | **Operating Temp** | -40°C to +85°C (Industrial Grade) | | **Output Frequency** | Custom (determined by the suffix, typically 10MHz to 800MHz) | --- ## 2. Key Components & Architecture The device consists of three main internal stages: 1. **Crystal Blank:** A high-precision quartz crystal cut to specific angles (AT-cut) to ensure thermal stability. 2. **Oscillator IC:** An application-specific integrated circuit (ASIC) that drives the crystal and performs frequency multiplication if necessary. 3. **Differential Driver:** A specialized output stage that produces two signals ($OUT$ and $\overline{OUT}$) that are 180 degrees out of phase. This cancels out common-mode noise. --- ## 3. Pin Configuration (6-Pad SMD) The layout is standardized for high-speed differential oscillators: | Pin # | Function | Description | | :--- | :--- | :--- | | **1** | OE or NC | Output Enable (High = Active, Low = High Impedance) | | **2** | NC | No Connection | | **3** | GND | Ground / Case Connection | | **4** | Output | Positive Differential Output | | **5** | Comp Output | Complementary (Negative) Differential Output | | **6** | VDD | Power Supply (+3.3V) | --- ## 4. Typical Applications Due to the **LVPECL** output, this part is used where signal integrity over distance and high-speed data processing are critical: * **Networking:** Fiber Channel, Gigabit Ethernet (10G/40G/100G). * **Telecommunications:** SONET/SDH infrastructures. * **Computing:** High-speed servers and PCI Express clocking. * **Storage:** SAS/SATA interface timing. --- ## 5. Part Number Decoding The "MHO" series breakdown is as follows: * **MHO:** Mercury High Output (PECL/LVPECL Series). * **13:** Refers to the supply voltage and package style (3.3V, 7x5mm). * **F:** Frequency stability code (often ±25ppm or ±50ppm). * **G:** Operating temperature range (G = Industrial -40 to +85°C). * **D:** Duty Cycle (D = 45/55%). * **R:** RoHS Compliant.