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Part Number: ISOW7841
I have used ISOW7841 inbetween microcontroller and ADC(ADC128s022) with reference Ic(LM4132-4.1V).When i measure the reference voltage it showing 4.35V but i am using 4.1V reference.I have attached the schematic for your reference.Schematic Prints1.pdf
In the "Recommended Operating Conditions" for ADC128S the range of VD is restricted to the range 2.7V to VA.
I suspect with VD=5V and VA=4.1V the reference may be being pulled up by currents flowing from VD to VA in the ADC128S.
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In reply to Alex Ballantyne:
In reply to ganesh sankara:
That is puzzling, your schematic looks good but your reference voltage is always higher than it should be, no matter what VD or VA you choose.
I wonder what your SPI interface is connected to. Is the ADC enabled? Are you able to disconnect the reference from the ADC? If you do that is the reference output correct?
SPI interface with Microcontroller.The same hardware design i have without ISOW7841 that works perfectly.and i Disconnect the reference from ADC the voltage is 4.25V the same voltage when connected to 4.1V reference IC.
Should i test the option of VA=5V and VD=3.3V.
VA is at the Reference output. ADC and Reference are both connected
I Tested connecting the GND and GND(A)2 but there no effect.
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