Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question

AD420: Output voltage range

the output voltage range of the ad420 is only 4,90V and not 5V!!
What?s wrong??


The AD420 is primarily used as a precision current output DAC in 4-20mA loop
systems delivering a programmed current into a grounded load. In voltage output
mode the current source is set to swing 0 to 4mA and fed into an internal
trimmed 1.25kohm resistor load. The Vout performance does not meet the
performance of the Iout output. The expected total output error for Vout is 1%
typical, this is with REFIN= REFOUT and includes reference errors.

If you see that the voltage output swing is 0 to 4.90V, this is a total error
of 2%. You may be able to improve on this error by ensuring you have
REFIN=REFOUT, using a higher power supply voltage, reducing the output load. 
However a voltage error of 2% is possible at extremes.

If you require a precision voltage output, I recommend using the AD420 in
current output mode (0-20mA) with an external precision resistor.