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--- nico:ad:ad639 [2017/12/12 19:25] – mcmaster
+++ nico:ad:ad639 [2017/12/12 19:53] (current) – mcmaster
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 {{tag>collection_nico vendor_ad type_unknown year_unknown foundry_unknown}}
+Universal Trigonometric Function Converter
+"The AD639 is a general trigonometric function generator where the output is a scaled ratio of two sines, where each sine has tunable parameters. The package on this one was another ceramic case with a gold cover that was held on by solder. Heating the case and pushing over the solder revealed a very clean chip with a seemingly small number of transistors. No markings were found on the chip other than the model number and Analog’s logo."
+Source: http://microblog.routed.net/2007/03/30/ic-friday-analog-devices-ad639/
 ====== Package ======