AD8017 single 5 V power supply operation

AD8017 is configured for use on signle +5 V power supply. It is used for inverting(unity gain) the input signal. Rf = 619 ohms and Rg = 619 ohms. Rt = 52 ohms. The positive terminal(pin no 3) is connected to ground. 

When an input signal (DC) voltage of 1.9 V to 0.9 V is applied at Rg(one end) to the above circuit, the output at pin no 1 observed is 140 mV constant.

Kindly clarify / provide a solution.