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3 questions for your AD5700-1

Question asked by Kaos on Sep 8, 2015
Latest reply on Sep 16, 2015 by Kaos

Dear Sir/Madam,


Our customer is studying with your AD5700-1 HART modem.

So he has tossed the following questions.



When he receive the HART signal, what is the min-max time of 1bit pulse width the digital signal that is outputed from RxD pin?

Your recommended value is 833usec. But what is the min-max value?



As for the HART signal that is inputed to ADC_IP pin, what is the delay time the digital signal that is outputed from RxD pin?



The schematic of customer same as Fig-23 value (Ref voltage divided by 2-1.2Mohm, and put it into ADC_IP pin).

So he has catched REF and ADC_IP voltage as REF=1.501V ADC_IP=0.803V when does not communicate HART. They catched by DMM not scope shot.

He expected the ADC_IP=0.75V in this case.

Does your ADC_IP pin load a little bit current?

I am confirming the tolerance of the divide 2 resisters also.


Thanks Kaos