The **M3V18TAJ-R** is a specific electronic component belonging to the **Voltage Controlled Crystal Oscillator (VCXO)** family, typically manufactured by companies like **CTS Electronic Components**. It is designed for high-precision timing applications where the frequency needs to be adjusted or "pulled" by an external control voltage. --- ## 1. Technical Specifications Below are the primary technical parameters for the M3V18TAJ-R series: | Feature | Specification | | :--- | :--- | | **Component Type** | VCXO (Voltage Controlled Crystal Oscillator) | | **Package Type** | Surface Mount (SMD) | | **Package Size** | 3.2mm x 5.0mm (Typical for M3V series) | | **Output Type** | HCMOS / TTL | | **Supply Voltage (Vcc)** | +3.3 Vdc | | **Operating Temperature** | -40°C to +85°C (Industrial Grade) | | **Frequency Stability** | ±50ppm (Standard for "A" code) | | **Pullability/APR** | ±50ppm to ±100ppm | --- ## 2. Part Number Breakdown The suffix and prefix codes define the specific behavior of the oscillator: * **M3V**: Identifies the product series (3.2x5.0mm VCXO). * **18**: Typically refers to the specific frequency or a variation in voltage (3.3V). * **T**: Indicates the frequency stability rating. * **A**: Represents the operating temperature range (Industrial: -40°C to +85°C). * **J**: Refers to the Absolute Pull Range (APR). * **-R**: Indicates **RoHS Compliant** and usually shipped in Tape & Reel packaging. --- ## 3. Key Electronic Functions ### A. Voltage Control (Pin 1) Unlike a standard crystal oscillator, the M3V18TAJ-R features a control voltage pin. By varying the voltage on this pin (usually between 0.3V and 3.0V), the output frequency can be slightly shifted. This is essential for: * Phase Locked Loops (PLL). * Synchronizing clock signals in telecommunications. ### B. HCMOS Output The part provides a square wave output compatible with High-Speed CMOS logic levels. It is designed to drive loads typically up to 15pF. ### C. Tri-State Functionality Most models in this series include an "Enable/Disable" function. When the enable pin is set low, the output goes into a high-impedance state, reducing power consumption. --- ## 4. Typical Applications The M3V18TAJ-R is commonly found in circuits requiring precise clock synchronization: 1. **xDSL / ADSL Modems:** For data stream timing. 2. **Set-Top Boxes:** Video clock recovery. 3. **SONET / SDH:** High-speed fiber optic networking. 4. **Wireless Base Stations:** Frequency synthesis. --- ## 5. Typical Pin Configuration | Pin Number | Function | Description | | :--- | :--- | :--- | | 1 | Vc | Voltage Control (Frequency Adjustment) | | 2 | E/D | Enable / Disable (Output Control) | | 3 | GND | Circuit Ground | | 4 | Output | HCMOS Signal Output | | 5 | N/C | No Connection | | 6 | Vcc | Supply Voltage (+3.3V) |