The **M3V11T2AJ-R** is a high-performance **Voltage Controlled Crystal Oscillator (VCXO)** manufactured by **Epson**. It belongs to the M3 series, which is specifically designed for high-frequency applications requiring low jitter and high stability. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | VCXO (Voltage Controlled Crystal Oscillator) | | **Frequency Range** | 10 MHz to 1.4 GHz (Standard 156.25 MHz / 125 MHz common) | | **Output Type** | LV-PECL (Low-Voltage Positive Emitter-Coupled Logic) | | **Supply Voltage ($V_{cc}$)** | 3.3V (Standard) | | **Package Size** | 7.0 x 5.0 x 1.6 mm (8-pin Ceramic) | | **Frequency Stability** | ±50 ppm (Commonly, depends on specific grade) | | **Control Voltage ($V_c$)** | 0.0V to 3.3V | --- ### 2. Functional Characteristics #### A. VCXO Functionality The "Voltage Control" aspect allows the output frequency to be adjusted (pulled) by applying an external analog voltage. This is critical for Phase-Locked Loop (PLL) circuits where the clock needs to be synchronized with an external reference signal. #### B. LV-PECL Output The device utilizes **LV-PECL** signaling. This provides several advantages in high-speed electronics: * **High Speed:** Capable of gigahertz frequencies. * **Differential Signaling:** Offers high immunity to electromagnetic interference (EMI) and power supply noise. * **Low Jitter:** Essential for maintaining signal integrity in data communication. #### C. Absolute Pull Range (APR) The "AJ" in the part number often refers to the specific frequency pulling range. Typically, these devices offer a minimum pull range of **±50 ppm** to **±100 ppm**, ensuring the oscillator can compensate for temperature drifts or aging over time. --- ### 3. Application Areas Because of its precision and high-frequency output, the M3V11T2AJ-R is commonly found in: * **Networking Gear:** 10G/40G/100G Ethernet switches and routers. * **Optical Transport:** SONET/SDH and OTN equipment. * **Wireless Base Stations:** Used for timing and synchronization in LTE/5G infrastructure. * **Test & Measurement:** High-speed oscilloscopes and signal generators. --- ### 4. Pin Configuration (Typical 8-pin SMD) | Pin # | Function | Description | | :--- | :--- | :--- | | 1 | $V_c$ | Control Voltage (Frequency Tuning) | | 2 | OE or N.C. | Output Enable or No Connection | | 3 | GND | Ground | | 4 | OUT | Differential Output (+) | | 5 | $\overline{OUT}$ | Differential Output (-) | | 6 | $V_{cc}$ | Supply Voltage | ---