something of LTC1799IS5

The LTC1799IS5 is a precision oscillator that is easy to use
and occupies very little PC board space. The oscillator
frequency is programmed by a single external resistor
(RSET). The LTC1799 has been designed for high accuracy
operation (￡1.5% frequency error) without the need for
external trim components.
The LTC1799IS5 erates 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. The frequency-setting
resistor can vary from 3.32k to 1M to select a master
oscillator frequency between 100kHz and 30MHz (5V
supply). The three-state DIV input determines whether the
master clock is divided by 1, 10 or 100 before driving the
output, providing three frequency ranges spanning 1kHz
to 30MHz (5V supply). The LTC1799 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: