I want to chek the linearity ,accuracy and drift of the AD5791.
Can somebody tell me how ANALOG did this and maby have some hint or tricks for me.
Thanks in advance for any reaction
You could start with an Eval-AD5791 Board + SDP development platform board. There is an option in there to do a linearity/accuracy test.
The software can re-back with a USB to GPIB to a Agilent high precision (3458A) meter - if you have one of these.
I have an evaluation board and an Agilent high precision (3458A) meter but no SDP development platform board .
But i am able to connect the evaluation board to and io interface and program the AD5791 and readout the 34458A.
Process the data and make an INL plot.
BUT if i want to measure each point the measurment wil take a long time.
example: 1 measurement = 100mSec => all points = 0,1*2^20= 29 hour .
Is this the way you guys didi this at ANALOG to get the plots for the datasheet
Production parts are tested on manufacturing flows with optimised test routines.
The optimise time on the evaluation board you would need rto look at a short codes type measurement where the most sensitive adjacent codes are defined in a table an d the part clocks through these instead. The list is generated from design and characterisation work.
The measurement on the eval software cab be speeded up by increasing the code change increment from 1 to say 1000. As these are typical results anyway it gives a good indication of accuracy/linearity.
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