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Combining DACs for more current?

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rea5245:
If I use a dual DAC like the MCP4802 (https://ww1.microchip.com/downloads/en/DeviceDoc/20002249B.pdf) which has a typical short circuit current of 15 mA, is it reasonable to tie the two Vout pins together to drive a higher current load? (Obviously, I'd need to set both DACs to the same value.)

Thank you,
   Bob

David Hess:
Current sharing between the paralleled outputs will be poor because of the low output resistance from the closed loop operational amplifiers.  Voltage regulators, references, and operational amplifiers have the same problem and special circuits are used to allow parallel operation.

OM222O:
No! You use an amplifier circuit for that  :palm:

Mr. Scram:

--- Quote from: OM222O on August 11, 2020, 03:13:02 pm ---No! You use an amplifier circuit for that  :palm:

--- End quote ---
No need to be snippy. He's asking us exactly because he's aware there may be better solutions he doesn't know.

rea5245:

--- Quote from: OM222O on August 11, 2020, 03:13:02 pm ---No! You use an amplifier circuit for that  :palm:

--- End quote ---

Yeah, I know I need an op amp. Buffered DACs have op amps built in, right? So that's what I'm looking at. But even with the built-in op amps, they all seem to have relatively low current outputs. I'm looking for at least 30 mA.

- Bob

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