The **TCS-11-R** typically refers to a high-precision, sub-miniature **Quartz Crystal Oscillator**. This specific part is widely used in telecommunications, GPS modules, and mobile devices where frequency stability and a small footprint are critical. --- ### 1. Technical Specifications The "R" suffix often denotes specific packaging (like Tape & Reel) or a specialized frequency tolerance. Below are the common electronic characteristics: | Parameter | Typical Value | | :--- | :--- | | **Frequency Range** | 10 MHz to 52 MHz (Commonly 26MHz) | | **Supply Voltage (Vcc)** | 1.8V to 3.3V DC | | **Frequency Stability** | ±0.5 ppm to ±2.0 ppm | | **Operating Temperature** | -30°C to +85°C | | **Package Size** | 2.0 x 1.6 mm or 2.5 x 2.0 mm (SMD) | | **Output Type** | Clipped Sine Wave or CMOS | --- ### 2. Core Electronic Components Internally, the TCS-11-R is not just a piece of quartz; it is an integrated module consisting of: * **Quartz Crystal Blank:** The mechanical resonator that vibrates at a specific frequency when voltage is applied (Piezoelectric effect). * **Oscillator IC:** An application-specific integrated circuit (ASIC) that sustains the oscillation and manages the output signal. * **Varactor Diode (in TCXO variants):** Used to pull the frequency slightly to compensate for temperature changes. * **Thermistor:** A temperature-sensitive resistor used to sense ambient heat and provide feedback to the compensation circuit. --- ### 3. Pin Configuration (Typical 4-Pad SMD) Standard layouts for these oscillators follow a specific pinout to ensure signal integrity: | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | Vcont / NC | Voltage Control (for VC-TCXO) or No Connection | | **2** | GND | Ground connection | | **3** | Output | Frequency signal output | | **4** | Vcc | Power supply input | --- ### 4. Circuit Implementation When integrating the TCS-11-R into a PCB design, it is standard practice to include a decoupling capacitor to filter power supply noise. ```c // Typical Schematic Connection [Vcc] ----+---- [Pin 4: Vcc] | [0.1uF Capacitor] | [GND] ----+---- [Pin 2: GND] [Pin 3: Output] --------> [MCU / RF Chip Clock Input] ``` --- ### 5. Key Applications * **Smartphone RF Front-ends:** Provides the reference clock for LTE/5G transceivers. * **GNSS/GPS Modules:** High stability is required to lock onto satellite signals quickly (TTFF - Time To First Fix). * **Bluetooth/Wi-Fi:** Ensures the carrier frequency remains within the allocated band to prevent interference.