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( File format: PDF, 138857 )
17MHz to 170MHz Resistor Set SOT-23 Oscillator
Linear Technology Inc.

Description
The LTC?6905 precision, programmable silicon oscillator is easy to use and occupies very little board space. It requires only a single resistor to set the output frequency from 17MHz to 170MHz with a typical frequency error of 0.5% or less. The LTC6905 operates with a single 2.7V to 5.5V power supply and provides a rail-to-rail, 50% duty cycle square wave output. The CMOS output driver ensures fast rise/fall times and rail-to-rail switching. Operation is simple: A single resistor, RSET, between 10K to 25K is used to set the frequency, and an internal three-state divider (DIV input) allows for division of the master clock by 1, 2 or 4, providing three frequencies for each RSET value. The LTC6905 features a proprietary feedback loop that linearizes the relationship between RSET and frequency, eliminating the need for tables to calculate frequency. The oscillator can be easily programmed using the simple formula outlined below: Protected by U.S. Patents, including 6614313, 6342817.
Features
One External Resistor Sets the Frequency Fast Start-Up Time: 100?s Typical Frequency Range: 17MHz to 170MHz Frequency Error 0.5% Typ 17MHz to 170MHz(TA = 0C to 70C, Over All Settings) 20ppm/C Temperature Stability Rise Time: 0.5ns, CL = 5pF Timing Jitter: 50ps at 170MHz 50% 2.5% Duty Cycle 6mA Typical Supply Current, fOSC = 100MHz CMOS Output Drives 500 Ohm Load (VS = 3V) Operates from a Single 2.7V to 5.5V Supply Low Profile (1mm) ThinSOTTM Package




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