The **M3V28T2AJ-R** is a specific part number belonging to the family of **Voltage Controlled Crystal Oscillators (VCXO)**, typically manufactured by suppliers like **Epson** or similar high-precision timing component vendors. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Component Overview A VCXO is an oscillator where the oscillation frequency can be adjusted by changing the input control voltage. The "M3" series usually indicates a specific package size and output type (typically HCMOS). ### Key Technical Specifications | Parameter | Typical Value | Description | | :--- | :--- | :--- | | **Type** | VCXO | Voltage Controlled Crystal Oscillator | | **Package Size** | 7.0 x 5.0 mm | Standard 6-pin ceramic SMD package | | **Nominal Frequency** | 28.322 MHz (typical) | Varies slightly by exact dash suffix | | **Output Type** | CMOS / HCMOS | Logic level output for digital circuits | | **Supply Voltage (Vcc)** | 3.3V | Operating voltage range | | **Frequency Pull Range** | ±50 ppm to ±100 ppm | The range the frequency can be shifted | | **Operating Temperature** | -40°C to +85°C | Industrial grade temperature range | --- ## 2. Pin Configuration The M3V series typically uses a 6-pin layout to accommodate the voltage control functionality. | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **Vc** | Control Voltage input (affects frequency) | | **2** | **OE / NC** | Output Enable (High = Active) or No Connect | | **3** | **GND** | Ground connection | | **4** | **OUT** | Clock Signal Output | | **5** | **NC** | No Connect | | **6** | **Vcc** | Power Supply (+3.3V) | --- ## 3. Core Functions & Applications ### Functions * **Frequency Modulation:** The control voltage (Pin 1) allows the system to fine-tune the clock speed to match other signals. * **Phase-Locked Loops (PLL):** Frequently used as the local oscillator in a PLL circuit to synchronize data streams. * **Jitter Reduction:** Provides a stable, low-noise reference clock for sensitive digital processors. ### Typical Applications 1. **Telecommunications:** Base stations and networking hardware (SDH/SONET). 2. **Video Equipment:** Digital video processing where frame rates must be perfectly synchronized. 3. **Data Converters:** Providing the sampling clock for high-speed ADCs and DACs. 4. **Set-Top Boxes:** Clock recovery in digital broadcasting. --- ## 4. Part Number Breakdown (Generic) While codes vary by manufacturer, the M3V string generally follows this logic: * **M3V:** Series identifier (VCXO, 3.3V). * **28:** Often represents a frequency prefix (e.g., 28.xxx MHz). * **T:** Temperature range or stability code. * **2AJ:** Specific internal factory calibration or package variant. * **-R:** Indicates "Tape & Reel" packaging for automated assembly. ---