Micropower oscillators are precise
11 July 2008
The LTC6930 low power precision silicon oscillators from Linear Technology are 99.91 per cent accurate to effectively manage power.
There are five versions available, with fixed frequencies are from 32.768kHz to 8.192MHz. The LTC6930-4.19 covers 32.768kHz to 4.194MHz; the LTC6930-5.00 covers 39.1kHz to 5MHz; the LTC6930-7.37 covers 57.6kHZ to 7.373MHz; the LTC6930-8.00 covers 62.5kHz to 8MHz and the LTC6930-8.19 covers 64kHz to 8.192MHz. The frequency accuracy is described as next-generation for use in industrial and handheld devices.
Each oscillator has a unique master frequency and digitally controlled frequency dividers for eight frequencies per device. Frequency shifting is accomplished within a single clock cycle and without glitches, which is claimed to be a powerful tool for system configuration or power management through clock-speed control.
Drawing only 105uA at 32kHz and requiring only a single 1.7V to 5.5V supply, the LTC6930 can operate from two unregulated NiCad batteries. Battery life is extended, using the fast startup, where minimal power is lost during the clock power-up. Instead of the conventional start-up time of more than one msec, the oscillators have a guaranteed startup time of less than 110usec.
The 0.09 per cent frequency tolerance (maximum) at 25°C makes the oscillators suitable for applications such as serial port communications and microprocessor clocks. Typical RMS period jitter is less than 0.15 per cent. No external components are required to set the frequency. They are specified for operation from -40°C to 125°C and are claimed to offer rugged, reliable operation in environments unsuitable for crystal-based oscillators. They are available in a 2mm x 3mm DFN and an eight-lead MSOP.
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