[sdiy] LM13700 questions
David G Dixon
dixon at mail.ubc.ca
Fri Aug 17 09:31:08 CEST 2012
> Is it OK to use the current output of an LM13700 to feed the
> Iabc pin of another LM1300?
I don't see why not.
> According to the datasheet the maximum output current is in a
> suitable range for the Iabc. The only concern I have is that
> the Iabc pin is referenced to the negative rail.
As long as you don't exceed the absolute maximum rating of the 13700 (2 mA
to Iabc -- 1 mA is safer) you should be OK.
> The application I have in mind is voltage control of
> modulation amount.
This is a classic VCA application. Why not just apply the voltage to one
OTA? Why do you need two?
> It seems silly to convert the current to a voltage and back
> to a current again...
It is. I do this sort of thing all the time with SSM2164 VCAs. You can
chain them together like a choo-choo train.
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