The **CRO2156A-LF** is a high-performance **Voltage Controlled Oscillator (VCO)** manufactured by Z-Communications. It is specifically designed for high-frequency signal generation in wireless communication systems. --- ### 1. Key Technical Specifications The following table outlines the core electronic parameters of the CRO2156A-LF: | Parameter | Specification | Unit | | :--- | :--- | :--- | | **Frequency Range** | 2156 – 2156 | MHz | | **Tuning Voltage** | 0.5 to 4.5 | Vdc | | **Output Power** | 2 ± 3 | dBm | | **Phase Noise (10 kHz offset)** | -110 (typ) | dBc/Hz | | **Supply Voltage (Vcc)** | 5 | Vdc | | **Supply Current (Icc)** | 25 (typ) | mA | | **Harmonic Suppression** | -15 (typ) | dBc | | **Operating Temperature** | -40 to 85 | °C | --- ### 2. Functional Description The device operates on a **Coaxial Resonator Oscillator (CRO)** architecture. This specific design offers several electronic advantages: * **Low Phase Noise:** Because it uses a high-Q coaxial resonator, it provides extremely clean signal generation, which is critical for reducing Bit Error Rates (BER) in digital communications. * **Voltage Tuning:** The oscillation frequency is adjusted by varying the input DC voltage on the tuning port. This allows the part to be integrated into Phase-Locked Loops (PLLs). * **Buffer Amplifier:** Internally, it typically includes a buffer stage to provide power and isolate the oscillator from load variations (load pulling). --- ### 3. Physical & Environmental Attributes * **Package Type:** It usually comes in a surface-mount package (e.g., MINI-16-LOW), making it suitable for automated PCB assembly. * **Lead-Free (LF):** The "LF" suffix indicates that the part is RoHS compliant, meaning it does not contain lead or other restricted hazardous substances. * **Application Areas:** * Digital Radio Equipment * Fixed Wireless Access * Satellite Communication * Test and Measurement Instrumentation --- ### 4. Application Circuit Example (Simplified) To integrate this part, a basic configuration requires stable DC filtering: ```c // Typical Connection Logic Vcc (Pin X) --> +5V DC (Filtered with 10uF and 100pF capacitors) Vtune (Pin Y) --> 0.5V to 4.5V Control Signal RF Out (Pin Z) --> 50 Ohm Load / Mixer Input GND (Case) --> System Ground Plane ```