Smallest 32.768 kHz clock oscillator: AT-xtal stability

April 20, 2016 // By Graham Prophet
IQD positions its latest 32.768 kHz clock oscillator as the smallest available, with a design that also delivers very low power. Measuring 1.6 x 1.2 x 0.7mm, it is housed in a hermetically sealed ceramic package. With a current consumption of 30 µA and with a standby current of 3 µA, it can be used in hand held and battery powered applications and where accuracy is required in real time clocks.

The range delivers better temperature characteristic than standard 32.768 kHz tuning fork crystal based oscillators due to the use of an AT-cut crystal normally found in higher frequency oscillators. Start-up time is 7 msec at 3.3V with a rise and fall time of 200 nsec. These CMOS based oscillators are available in three supply voltages: 1.8V (IQXO-986), 2.5V (IQXO-985) and 3.3V (IQXO-984) with frequency stabilities of ±30 ppm over an operating temperature range of -20 to 70C or ±50ppm over -40 to 85C. Typical applications include battery management systems, communication modules and systems (Bluetooth, Wi-Fi, Wireless LAN & Zigbee), LCD lighting systems and smart meters (AMR).