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- Crystal Source
April 18, 2005, 10:06 pm
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Re: Crystal Source
Generically, try DigiKey (www.digikey.com) or Jameco (www.jameco.com) for
crystals but if you are looking for something like an oscillator, I found a
great source in the Linear Technology LTC6900 chip. It's in an SOT-23-5
package (very small) and requires a single 0.1uF cap (which you ususally put
on your oscillator anyway) and a single resistor. The resistor is used to
program your desired frequency anywhere from 1KHz to 20MHz. It operates on
a single supply voltage anywhere from 2.7VDC to 5.5VDC. The device runs on
about 500uA. I ran a test with a PIC18LF252 operating at an external 10MHz
with the internal 4X multiplier in the PLL (so the part was running at
40MHz) and an RS232 line running at 9600 baud into a HyperTerminal. The
program sent a message to the serial port every second. It worked without
error for the length of the test (over 6 hours).
The device cost about $1.50 each when I got 25 from Linear Technology
Hope this helps.
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