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OPT101: Current responsivity of the OPT101's photodiode

Part Number: OPT101

Hi, could someone verify the value for the current responsivity of the diode.

According to the datasheet on page six, where the specs for the optical sensor are listed, there sits a value of 865 (uA/W)/cm2.

Either I don't get its meaning or I'm stupid (most probably both !)

If I get a responsivity  R = 0.45 A/W for uniformly illuminated phd with a sensitive area Sphd = 5.2mm2 when I divide R/Sphd I dont't get the number listed. Why?