how muh of voltage i have to give for the current output DAC

[UshaMaram]

hi,
Iam using the DAC (AD5422),the out put of the DAC in current(0-20mA,4-20mA) and voltage . what is the voltage i have to provide to the current output of the DAC to form the loop

 

[dick_freebird]

The output current would be summed against the
output voltage through a feedback resistor, to get
a voltage DAC output in the end. That makes a "virtual
ground" (or common mode voltage) which you would
be best off making match what you see in test figures
for the linearity / error parameters. On older +/-15V
parts this is commonly ground potential but single-
supply systems will have a VCM chosen instead. If
output current is unidirectional then another resistor
from a reference voltage may be used to provide
the offset, summed into the same node as the DAC
current.

 

[UshaMaram]

Re: how muh of voltage i have to give for the current output

The DAC5422 generates the current and voltage outputs.when iam using the Current output from the DAC,how the loop will be completed and should i need to provide any voltage to complete the loop

 

[Petre Petrov]

Re: how muh of voltage i have to give for the current output

Hi!

Depends on the configuration of the loop.

What is your configuration?

May be you will find the answer here:


**broken link removed**

https://www.analog.com/static/imported-files/data_sheets/AD5412_5422.pdf

BR

 

[UshaMaram]

Re: how muh of voltage i have to give for the current output

Thanks Sir,

In the application they are not given any voltage in the output of current except the protection diodes.then how do i connect this current as a input in the other side.

 

[Petre Petrov]

Re: how muh of voltage i have to give for the current output

Simple example:

Rload = 250 Ohm
Imin = 0.00mA
Imax = 20 mA
Umax = 5.000V
Umin = 0.000V

Power supply: according to the data sheet and application notes.

several configurations:

**broken link removed**

OK?