Problem with ADG1606BRUZ current sourcing of 100mA

Hi,

i designed a precesion resistance measurement system using 100mA Constant current source.I used ADG1606BRUZ for channel switching.In my design i have 4 current source and 4 ADG1606BRUZ for 64 resistance measurement. ADG1606BRUZ is not providing 100mA current to cuircuit.I made a constant current source using LM317 regulator.

Connected the select line of all 4 muxes using same 4 GPIO.

Given seperate enable signals for muxes.

For low value resistance system works fine.

But for resistance above 12 ohm its gives wrong value.

Kindly please help me on this.