Spread Spectrum Crystals of CREC: The First Choice for Stable Operation of Automotive Electronics

Spread Spectrum Crystals of CREC have a wide range of applications in communication, computer, automotive electronics, medical, industrial automation and other fields.

How to reduce the electromagnetic interference of automotive equipment?

With the rapid development of electronic technology, the number of on-board electronic devices is increasing and their functions are becoming more and more complex in the automotive industry . These devices generate electromagnetic interference (EMI) during operation, posing a potential threat to the overall performance and safety of the vehicle.

Traditional methods of reducing EMI, such as adding magnetic beads, filters, etc., although to a certain extent can reduce electromagnetic interference, often cost more, and occupy valuable space in the car. Therefore, in recent years, spread spectrum technology has gradually become a common means of reducing EMI in the automotive field.

Spread Spectrum Crystal Working Principle

Spread Spectrum Crystal utilizes extended spectrum technology to effectively deal with interference problems in communications. It is a programmable active crystal, by adjusting the clock frequency to reduce EMI electromagnetic interference. It allows the energy of a narrowband clock source to be dispersed in a controlled manner over a wider frequency band, thereby reducing the main frequency and peak harmonic amplitude. Its principle of operation is shown in Figure 1.

Figure 1 Clock spreading principle

As shown in Figure 1, clock spreading reduces the clock amplitude while keeping the energy constant. Therefore, the amplitude of the MCLK clock signal can be suppressed by adding a spreading circuit; PCLK is based on MCLK and does not need to be altered, and its amplitude is reduced synchronously, as shown in Figure 2.

Figure 2 Clock signal spread spectrum

Advantages of Spread Spectrum Crystals

1. Reduce the impact of EMI: reduce electromagnetic radiation, and reduce the interference to the automotive electronic system.

2. Systematic advantage: spread spectrum crystal modulation clock and timing signals, to achieve significant improvements in system-wide EMI.

3. Reduce cost and time: the programmability and small size of the spread spectrum crystal help to quickly deliver and reduce PCB area.

4. Meet the needs of automotive electronic systems: respond to the increase in entertainment and auxiliary systems, spread spectrum crystals to ensure stable operation in compact high-speed circuit design.

Spread Spectrum Crystals are used in the following areas

1. Communication field: frequency synthesizer in radio equipment, generating different carrier frequencies.

2. Computer and electronic equipment: Provide accurate clock signals for motherboard and peripheral equipment to synchronize operation.

3. Automotive electronics and communication equipment: clock synchronization and data communication function of automotive ECU.

4. medical equipment: clock synchronization and signal acquisition timing for ECG, oximeter, blood pressure meter, etc.

5. Industrial automation: PLC clock synchronization and precise timing tasks.

Spread Spectrum Crystals of CREC have a wide range of applications in communication, computer, automotive electronics, medical, industrial automation, and other fields. Meanwhile, because of its high precision and stability, it is an indispensable component of automotive electronic system, which is of key significance to enhance system performance, guarantee driving safety, and promote intelligent development.