Epson differential crystal oscillator (SPXO)

    Differential crystal oscillator is a special type of crystal oscillator that eliminates common mode noise by outputting two signals with opposite phases, thereby achieving higher performance systems. This design makes differential crystal oscillators particularly popular in high-frequency and high-speed network electronic devices, as they can provide the advantages of high performance, low power consumption, and low noise. At present, the mass-produced Epson differential crystal oscillator covers a frequency range of 25MHz~700MHz, with five commonly used specifications including 2016, 2520, 3225, 5032, and 7050. Among them, the 2016 differential crystal oscillator achieves low power consumption and high precision in a smaller external size, making it suitable for differential crystal oscillator applications with strict power consumption requirements. EPSON differential crystal oscillators currently offer three output waveforms: LVDS, LV-PECL, and HCSL, each with multiple crystal oscillator packages for easy selection.

working principle

Differential crystal oscillator utilizes the resonance characteristics of crystal resonators to generate stable oscillation signals. By dividing the oscillation signal of the crystal resonator into two output signals with opposite phases, and amplifying and processing them through a differential amplification circuit, a stable differential output signal is generated. The advantage of this differential output is that it can reduce common mode noise, improve signal anti-interference ability and stability.

Advantages and disadvantages

Advantages: Differential crystal oscillators can improve anti-interference ability, reduce clock jitter, improve clock signal transmission quality, and increase noise tolerance. These characteristics make differential crystal oscillators particularly important in applications that require high stability and precise clock signals.

Disadvantages: Compared to single ended crystal oscillators, the design and manufacturing of differential crystal oscillators may be more complex and costly.

application area 

Differential crystal oscillators are widely used in communication systems, computers and data storage, automotive electronics, and industrial automation, providing accurate clock signals and frequency references for these systems. They meet the requirements of high-speed networks, network routers, fiber optic communication, gigabit networks, serial ATA, SCSI, high-end servers, computer peripherals PCI-Express、SDH、SONET、 Especially important in scenarios such as broadcasting services, mobile communication, base stations, network equipment, aerospace, and navigation.

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