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AD5522, having trouble with calibrate the force current

Question asked by HILO on Jul 11, 2016

My supplies as below

AVSS = -13V

AVCC = +18V

VREF = 5V

OFFSET_DAC_CODE = 42130 (0xA492)

 

according to the datasheet(Rev.E) on page 39, about calibrate the force current,

In FI mode, when I write zero-scale and full-scale, do I have to use R Load?

if NOT, I always got the same measure from MEASOUTx

if YES, it clamped by clamp function, I couldn't get the desire zero-scale and full-scale.

it would be over range at MEASOUTx if I disable clamp function.

 

Can someone give me some suggestion or detail about this. thanks for all.

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