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AD5700-1 and AD5422 for HART

Question asked by on Jul 26, 2018
Latest reply on Jul 30, 2018 by rrosario

I designed the circuit based on CN0278 and replaced AD5422 LFCSP version with TSSOP version.

AT HART_OUT pin, I can observe 500mVp-p signal, but at RSET pin, the signal is attenuated a lot and

the signal only has 50mVp-p swing. Judging from the CN0278 circuit note, it should be around 150mVp-p.

What is the cause of this problem?