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XTR108: 4-20 mA analog amplifier data sheet questions

Part Number: XTR108

I have a XTR108EA/2K5 and wanted to give it an external reference voltage. The industrially trimmed, internal, nominal reference voltage seems to be 1.193 maximum looks to be 1.4 V, but what is the minimum input voltage ref, and what's the maximum input current on the V_ref_in with high input impeadance? Also, if someone knows, is there any limits to how low the Vref input's Temperature coefficient must be? it looks like it's internal Vref is 5 ppm/C, so 5 know it's around that, but I'd like to get a well defined understanding.