The **MHO+78TDD-R** is a high-performance, differential crystal oscillator (XO) manufactured by **MtronPTI**. It is specifically designed for high-frequency applications requiring low jitter and stable timing. ### 1. General Specifications The part number follows a specific nomenclature used by MtronPTI to define its electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Output Type** | LVDS (Low Voltage Differential Signaling) | | **Operating Voltage** | 3.3V (Standard for +78 series) | | **Package Size** | 5.0 x 7.0 mm (6-pad SMD) | | **Frequency Range** | Typically 150MHz to 800MHz (Depends on specific tuning) | | **Stability** | ±50ppm or ±25ppm (Standard options) | --- ### 2. Key Electronic Components & Features * **Differential LVDS Driver:** Unlike standard CMOS oscillators, the "TDD" designation indicates an LVDS output. This provides excellent noise immunity and low EMI, making it ideal for high-speed data transmission. * **Internal Voltage Regulation:** Includes internal circuitry to minimize phase noise caused by power supply fluctuations (PSRR). * **Tristate Function (Pin 1):** The "R" suffix often denotes the specific pin configuration or RoHS compliance, but primarily, these units feature an Enable/Disable function on Pin 1. * **Logic High:** Oscillator output is active. * **Logic Low:** Output enters high impedance (Z) to save power. --- ### 3. Pinout Configuration The MHO+ series typically utilizes a standard 6-pad layout for differential oscillators: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | E/D (Enable/Disable) | Control signal to activate/deactivate output | | **2** | N/C | No Connection (internal use only) | | **3** | GND | Case and circuit ground | | **4** | Output (+) | Non-inverted LVDS signal | | **5** | Output (-) | Inverted LVDS signal | | **6** | Vcc | Positive supply voltage (+3.3V) | --- ### 4. Typical Applications Due to its low jitter and differential signaling, this part is commonly used in: * **Networking:** Gigabit Ethernet, Fibre Channel, and SONET/SDH. * **Computing:** High-speed SerDes (Serializer/Deserializer) clocking. * **FPGA Clocking:** Providing a clean reference clock for Xilinx or Intel Altera FPGAs. ---