## Analysis of CSBFB455KJ58-R1 The **CSBFB455KJ58-R1** is a high-precision ceramic resonator manufactured by **Murata Electronics**. It belongs to the CSBF family, which is specifically designed for low-frequency applications, primarily serving as a frequency control element in microcomputer reference clocks and remote control units. --- ### 1. Technical Specifications The following table highlights the critical electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Oscillating Frequency** | 455.0 kHz | | **Initial Tolerance** | ±0.5% (±2.275 kHz) | | **Resonant Impedance** | 20 $\Omega$ (Max) | | **Temperature Stability** | ±0.3% (-20°C to +80°C) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 5.0 x 4.8 mm | | **Capacitance (Built-in)** | Not included (Requires external capacitors) | --- ### 2. Functional Principles Ceramic resonators operate on the principle of **piezoelectricity**. When an electrical signal is applied to the ceramic element, it vibrates mechanically at a specific frequency (in this case, 455 kHz). * **Frequency Control:** It acts as a band-pass filter or a stable frequency source for an oscillator circuit. * **455 kHz Standard:** This is a classic "Intermediate Frequency" (IF) used globally in AM radio receivers and remote control transmission protocols. --- ### 3. Application Circuit Unlike the "CST" series from Murata, the **CSB** series usually requires external load capacitors ($C_1$ and $C_2$) to complete the Pierce oscillator circuit. ```c IC (Microcontroller/Inverter) +-----------------------+ | XTAL1 XTAL2 | +---------|-------|-----+ | | C1 -------+--[R]--+------- C2 (100pF) | | (100pF) [Resonator] | Ground ``` *Note: [R] represents a feedback resistor (usually 1MΩ) often integrated within the IC.* --- ### 4. Key Advantages 1. **Size:** The SMD form factor allows for high-density PCB mounting compared to older through-hole versions. 2. **Cost:** Significantly cheaper than quartz crystals. 3. **Startup Time:** Faster startup time compared to quartz crystals, making them ideal for battery-operated devices that wake up frequently from sleep mode. 4. **Durability:** High mechanical vibration and shock resistance. ---