Kyocera announces industry’s first crystal unit with a thermistor for wireless communication
Kyocera has produced the industry’s first crystal unit with a thermistor, a temperature sensing component. This product named CT2520DB is an AT cut type crystal unit with a size of 2.5 x 2.0mm, the frequency is 19.2MHz, and the operating temperature range is -30 to +105 degrees Celsius which fits the specifications for wireless communication. In order to compensate frequency change caused by thermal transients, the thermistor is placed as close as possible to the crystal unit. Mobile handsets such as cellular phones require crystal devices to produce the reference signal for stable communication. In these systems, temperature compensation of the crystal unit is quite important to minimize frequency change under a wide operating temperature range.
These days crystal units are coming to be used in many designs replacing TCXOs, a popularly used device currently, in an increasing number of smartphones, 3G and CDMA handsets; and temperature sensors are required to be placed as close as possible to the crystal unit for high precision temperature compensation. The new product was created by KYOCERA Kinseki Corporation, a wholly-owned subsidiary of Kyocera engaged in the development and manufacturing of crystal devices.