The **FTS-55-R/BN** is a high-performance, ultra-low noise **OCXO (Oven Controlled Crystal Oscillator)** designed primarily for synchronization and frequency reference applications. It is engineered to provide an extremely stable 10 MHz output. --- ## 1. Core Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Frequency** | 10.0 MHz | | **Output Waveform** | Sine Wave | | **Supply Voltage** | 12V DC (typical) | | **Operating Temperature** | -20°C to +70°C (Standard commercial/industrial) | | **Package Type** | Through-hole (Metal Can) | | **Phase Noise** | Ultra-low (typically -110 dBc/Hz @ 1Hz offset) | --- ## 2. Key Electronic Features ### A. Oven Control Mechanism The "Oven" in OCXO refers to an internal heating element and thermistor circuit. It maintains the quartz crystal at a specific "turning point" temperature (usually around 75°C to 85°C) where the crystal's frequency-to-temperature slope is zero. This prevents frequency drift caused by ambient temperature changes. ### B. SC-Cut Quartz Crystal The FTS-55 series typically utilizes an **SC-cut (Stress Compensated)** crystal. Compared to standard AT-cut crystals, the SC-cut offers: * Superior thermal stability. * Lower sensitivity to mechanical shock and vibration. * Reduced aging rates. ### C. Low Phase Noise Circuitry The "BN" designation often refers to specific low-noise enhancements. This part is optimized to minimize "jitter," making it ideal for high-speed data conversion (ADC/DAC clocking) and RF up/down conversion. --- ## 3. Pin Configuration & Hardware Interface The unit typically features a standard 5-pin or 4-pin layout in a rectangular metal housing: 1. **VCC:** Power supply input (12V). 2. **RF Out:** The 10 MHz sine wave output. 3. **Ground:** Case and circuit ground. 4. **V-Control (Optional):** An electronic frequency control (EFC) pin to fine-tune the frequency via an external voltage. 5. **Reference Voltage (Optional):** A stable output voltage to use with a potentiometer for manual tuning. --- ## 4. Typical Applications * **Telecommunications:** Base station synchronization (LTE, 5G). * **Test & Measurement:** Time bases for frequency counters and spectrum analyzers. * **Satellite Ground Stations:** Stable local oscillators for signal processing. * **Audio/Video:** Master clocking for high-end digital audio converters.