Quote:
Originally Posted by Radio Wrangler
Once upon a long time ago, there was a little oscillator chip called MC1648. It was part of Motorola's MECL III logic series. It could go up to about 200MHz and got used in all sorts of things. Motorola improved their processing for later MECL families, but kept the old 1648 on. It performed a valuable function. It may have had a few die shrinks along the way. The bipolar transistors making up the 1648 became much livelier. and later production parts fitted to old PCBs started to think the old resonator tanks looked like decouplers, and that the tracks to the tanks looked like much more interesting resonators.
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Ha ! I wish you had told me this a year ago. I attempted to use this IC as the 16MHz VCO in my PAL freeze frame machine. I had all kinds of trouble with it and in the end gave up. Instead I made an Xtal oscillator with a varicap diode and a 74HCU04 buffer IC and had no troubles.