The **GD-CSSRM2.14** is a specialized electronic component, specifically a **Surface Acoustic Wave (SAW) Resonator**. These components are critical for frequency control and stabilization in high-frequency wireless communication systems. --- ### 1. General Specifications The GD-CSSRM2.14 is designed to provide a precise reference frequency, typically in the **433.92 MHz** range (common for ISM band applications), though specific variants may exist. | Feature | Description | | :--- | :--- | | **Component Type** | SAW Resonator (One-Port) | | **Package Type** | SMD (Surface Mount Device) | | **Package Size** | Typically 3.0 x 3.0 mm or 3.8 x 3.8 mm | | **Center Frequency** | 433.92 MHz (Standard) | | **Insertion Loss** | Typical 1.0 - 1.5 dB | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Key Internal Electronic Parts A SAW resonator like the GD-CSSRM2.14 does not contain traditional silicon transistors, but rather a micro-mechanical structure on a piezoelectric substrate: 1. **Piezoelectric Substrate:** Usually made of **Quartz** or **Lithium Tantalate**. It converts electrical energy into mechanical acoustic waves and back again. 2. **IDT (Interdigital Transducer):** A series of interleaved metal "fingers" (usually aluminum) deposited on the substrate. The spacing of these fingers determines the resonant frequency. 3. **Reflectors:** Metal strips placed on either side of the IDT to reflect acoustic waves back into the transducer, creating a standing wave (resonance). 4. **Ceramic Package:** A hermetically sealed housing that protects the delicate IDT structure from moisture and physical damage. --- ### 3. Equivalent Circuit Model In electronic circuit simulation (like SPICE), the GD-CSSRM2.14 is represented by a **Butterworth-Van Dyke (BVD) model**: ```mermaid graph LR A[In] --- C0(Static Capacitance C0) --- B[Out] A --- Lm(Motional Inductance Lm) --- Cm(Motional Capacitance Cm) --- Rm(Motional Resistance Rm) --- B ``` * **$C_0$:** Static capacitance between the electrodes. * **$R_m, L_m, C_m$:** Represent the mechanical resonance properties of the SAW wave. --- ### 4. Typical Applications This component is widely used in low-power wireless transmitters: * **Remote Keyless Entry (RKE):** Automotive key fobs. * **Smart Home:** Wireless doorbells and light switches. * **Security:** Wireless alarm sensors and PIR detectors. * **Industrial:** Short-range data transmission (SRD). ---