Release date:2020-05-18
In the era of rapid development of the network, we go into public places, always wearing bluetooth headset casually look at the phone or listen to beautiful music, have to let people sigh the shock of the high-tech information age, bluetooth headset to our life has brought great convenience, wireless transmission has also got rid of the analog signal transmission line.
What are the bluetooth products today? For example: bluetooth headset, bluetooth mobile phone, car bluetooth, 2.4g bluetooth and so on. Bluetooth is a radio technology that supports short distance communication, usually about 10 meters. The use of bluetooth series can effectively simplify the communication between the mobile communication and the terminal, so as to make the data transmission more convenient. Most smartphones inside to open the "Settings" would have a bluetooth tool, bluetooth technology in the mobile phone is used for a major breakthrough of electronic products, and bluetooth headset has a patch on crystal, is the work in order to provide a stable clock frequency, and don't have the tiny patch of crystal, so the bluetooth will not be able to work properly.
The crystal vibration used in bluetooth products is usually packed in 3225, which is also the most commonly used package. Of course, 2520 packaging will also be used, but it will cost much more than 3225 packaging. Common frequency: 3225/12mhz, 3225/16mhz, 3225/24mhz, 3225/26mhz, 3225/32mhz, etc. More commonly used is 26M of 3225 packaging, which is also most often provided by manufacturers and suppliers, so the goods are enough. For crystal oscillations at these frequencies, the commonly used load capacitors are 7PF, 9PF, 12PF, and 20PF, of which 9PF is the most widely used. The crystal vibration of bluetooth chip has very important parameters, namely frequency error, namely frequency accuracy. Currently, there are three frequency differences of ±10PPM, ±20PPM and ±30PPM in the market. However, manufacturers usually choose 10PPM crystal vibrations because ±10PPM is more stable and reliable, although the 30PPM price is relatively low.
