Miniaturization, chip size, high precision, and low power consumption have become a trend!

The process of miniaturization of crystal oscillators is accelerated. It can be seen from the past 20 years that the volume of the crystal oscillator has been reduced from about 150 cubic millimeters to about 0.75 cubic millimeters (such as 1612 chip crystals), and it has dropped to the original 1/200. Take the mobile phone Bluetooth module as an example. The mobile phone Bluetooth usually requires a high-frequency crystal oscillator and a low-frequency crystal oscillator with a working frequency of 32.768KHZ. The high-frequency crystal oscillator is gradually expanded from the initial 5.0*3.2 to 3.2*2.5 SMD crystal and 2.5*2.0 SMD crystal; in addition, the 32.768K crystal is from the original cylindrical in-line (tuning fork) crystal to the size of 7.0*1.5mm SMD crystal oscillators (such as Seiko Electronics’ SSP-T7-F, Epson MC-146), and then gradually expanded to the currently commonly used products with a package size of 3.2*1.5mm (such as large vacuum DST310, Epson FC-135), In the future, the penetration rate of chip crystal oscillators with a size of 2.0*1.6mm (such as Epson FC-12M) will gradually increase.

The crystal oscillator chip rate has gradually improved. SMD packaged crystal oscillators have the characteristics of small size and easy mounting, and have once become the mainstream of the market. At present, the global chipping rate of quartz crystal components is about 70%, and the chipping rate in Japan is as high as 80%. In recent years, with the release of SMD crystal oscillator production capacity of domestic enterprises, the chipping rate of my country's crystal oscillators has also improved from time to time. Taking the camera as an example, the crystal used is from a 12MHz 49S cylindrical in-line crystal oscillator, to a 49SMD chip crystal oscillator, and then to the usual 5032 and 3225 chip crystal oscillators.

The crystal oscillator expands in the direction of high precision. The frequency devices made of quartz material have a certain temperature drift, that is, the oscillation frequency of the crystal oscillator will have a slight deviation with the change of the ambient temperature. It is precisely due to the existence of temperature drift that the accuracy of ordinary crystal oscillators is mostly 10ppm-50ppm (ppm represents one part per million, indicating the accuracy and relative tendency of the crystal oscillator). Beidou GPS positioning and navigation systems, artificial satellites, wireless base stations and other high-tech fields require higher stability, and require high-precision, low power consumption, and low trembling temperature-compensated crystal oscillator (TCXO), and its unique temperature compensation function The frequency tendency can be controlled within ±0.5ppm to ±2ppm. In addition, the application of temperature-compensated crystal oscillators in smart phones can well deal with the problems of mobile phone heating, explosion, and battery running and shutdown caused in extreme environments. When the outside temperature changes, TCXO can stably control the temperature within the regulated range.

The low power consumption of crystal oscillators has become a trend. Many temperature-controlled crystal oscillators and voltage-controlled crystal oscillators consume only 1.5-10mA under 3.3V voltage conditions. For example, Epson's VG-4231CB voltage-controlled crystal oscillator, the current consumption is only 1.6-2.8mA. The rapid start technology of the crystal oscillator also made a breakthrough. For example, Epson's TG-5006CJ temperature compensated crystal oscillator can reach 90% of the rated value 5ms after the oscillation starts.