THS4561: THS4561 operational amplifier output saturation,not changing with input

hi 

I use THS4561 to convert the input single ended signal into a differential signal and input it into ADS8900.

In actual testing, when I input a signal of 0V, the positive end of the operational amplifier outputs(OUTP) 4.14V and the negative end outputs((OUTM) ) 0.026V. After changing the input voltage, the positive output of the operational amplifier remained at 4.14v and the negative output remained at 0.026v.

When I disconnected the ADC, I measured that the positive output of the operational amplifier(OUTP)  was 4.9v and the negative output(OUTM ) was 0.026v.
The circuit parameters are as follows
VSP=5V
VSM=0V
VCOM=2V

PD=5v