LTC1799 RC oscillator chip

I found this file on the web site recently:

http://wb9kzy.com/ltc1799.wav

It's a recording of an LTC1799 chip

the simple example circuit for the LTC1799 chip

, here is an article from the vendor on using the LTC1799:

https://www.analog.com/media/en/technical-documentation/lt-journal-article/ltmag_v11n1_feb01.pdf

Here is the LT1799 product page:

https://www.analog.com/en/products/ltc1799.html#product-overview

I tried using the chip because I thought it might be useful for a beacon.   I had also seen an announcement from Ocean State Electronics or maybe Philmore that a VFO kit or module would be sold using the chip.  As can be heard from the audio sample, the RC oscillator has an unpleasant warble to it.  Probably not a good choice for a VFO.  The LTC1799 output frequency also drifted higher as time went on (positive temperature correlation).  But it was a really simple circuit.

Here is data in a text file from a 60 minute drift test run on the LTC1799:

http://wb9kzy.com/ltc1799b.dat

Here is a chart of that data with the 6.58 MHz readings converted into delta Frequencies (by subtracting the lowest reading of the set).  The drift isn't horrible but it never really calms down.

minutes (plus one) on x axis, delta frequency in Hz on y axis

As I recall I eventually popped the chip accidentally via an overvoltage.  I don't remember what I did with it, the chip was soldered to a small 33205CA-ND adapter board for an SOT-23-5 surface mount part.  The LTC1799 has a built in divider of 1, 10 or 100 but I don't think I tried it.  That divider might make the warbling less  noticeable ?

There is also an LTC6900 chip which is a low power version of the LTC1799.  Unfortunately the LTC6900 is unobtainium right now until December 2022 at the earliest.  Also the chip isn't cheap, an SI5351 would be a better choice.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm