Demultiplexing with holding values on all outputs

MacIntoshCZ

Active Member

• Mar 15, 2021

• #1

I would like to set value by DAC, select output and then hold this value as reference on specific output until its changed.
I would like to use as low parts as possible. I know how to do it with op amp but it will be to much parts if i want more outputs...
Any ideas? Thanks

 

MacIntoshCZ

Active Member

• Mar 15, 2021

• #2

Ok found this, but price of that is too much =D

https://cz.mouser.com/datasheet/2/609/SMP18-1504217.pdf

 

MacIntoshCZ

Active Member

• Mar 15, 2021

• #3

I wanted to set discharing current for 9 batteries.

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Mar 15, 2021

• #4

An analog multiplexer feeding a capacitor for each output, and the DAC continuously "refreshing" the output values so they do not decay?

A CD4051 (or two of them) should work as the multiplexer (or rather demultiplexer).

 

MacIntoshCZ

Active Member

• Mar 15, 2021

• #5

Ok seems simple thanks. I was aware of voltage drops in time at output.