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AD5412 - DAC current output monitoring

Question asked by J-B on Jun 16, 2017
Latest reply on Jun 19, 2017 by rrosario

Hi all,

 

I plan to use the AD5412 as configurable current or voltage output interface implicated in a safety function. Because of safety constraints, I have to add a diagnostic to my function in ordre to verify the current/voltage that is actually outputted.

For voltage monitoring, it won’t be an issue.

 

For current monitoring, I ‘d thought that I could measure the voltage drop across the R3 internal resistor with a differential amplifier.

“Figure 74. IOUT Filter Circuitry” from AD5412 datasheet gives a 40 Ohm typical value. Would it be possible to get the tolerance of its impedance ?

My need doesn’t require an accurate current moniroting (around +/-10% resistor range would probably suit to me); however, I do need a therical tolerance value.

 

Thank you in advance for your feedback.

 

Best regards,

Jean-Baptiste Osmont

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