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AMC1301: equation for single ended output

Part Number: AMC1301

how to get equation 1?

if VCM = GND
VOUT = (R4/(R3+R4))+((R1+R2)/R2)*VOUTP-(R1/R2)VOUTN
if VCM, not GND, why become equation 1? not VOUT = (R4/(R3+R4))+((R1+R2)/R2)*VOUTP-(R1/R2)VOUTN+VCM