Other Parts Discussed in Thread: ISO224, TLV6001
Tool/software: WEBENCH® Design Tools
Hello,
I am designing isolated AC voltage sensing following ISO224EVM, In datasheet it is mentioned that VIN of ISO224 can not be more than 12 V The differential output with a full-scale voltage of 4 V,so VOUT (P-P) for the ISO224 is 4 V and VDD2 of ISO224 is 5volts, VOUT (P-P) required from the TLV6001 is 3 V(the voltage output swing can go up to 30 mV close to both the rails). TLV6001 supply is 3.3 V with level shifting 1.65 V.
The op amp must have a gain of 0.75, calculated as Opamp Gain = 3/4 = 0.75 V/V. so how can i set gain of 0.75 ? If i set unity gain than output from TLV6001 is 4 V and it is not in range of 3.3. Above analysis is for max: input voltage from resistive divider. If i set resistive divider for 120 AC system for max: voltage sensing and my AC output voltage is is not more than 60 V so VOUT(P-P) is 2 V then gain of TLV6001 is 3/2. please suggest me good solution . and in data sheet AC voltage range is from 50 V to 750 V . i am using low power module just for experimental verification 30 V AC can i use ISO224 for 30 V AC sensing 
