Switching a resistor ladder

by dandy   Last Updated November 08, 2018 22:25 PM

Can anyone suggest how i could switch this resistor ladder with the smallest possible footprint. I was looking up analog switches but not sure if thats the right way to go.enter image description here

enter image description here The circuit tells an ecu what speed to run the engine at, and states the resistor tolerance at 5%. I am hoping a little 20ish pin ic could do the job - just want to keep the circuit simple as possible.

Thanks in advance

Tags : signal switching


Answers 1


For many applications, I would say go with the analog switch. That said, you have some pretty low resistor values, and you need to be absolutely sure that your on resistance of the switch doesn't do anything nasty.

If you can't convince yourself that it's OK, I'd consider SSR's. You can get them in some pretty small packages. See http://www.ixysic.com/Products/SSRFormA.htm for one product line. You can get quads in small packages -- e.g., https://www.mouser.com/datasheet/2/389/vni4140k-32-974430.pdf

Scott Seidman
Scott Seidman
November 08, 2018 22:21 PM

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