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XTR111: Confirming the circuit and adding a filter to the I/O

Part Number: XTR111

circuit requirements that ı need
input voltage range 0-5V
output current range 0-20mA
Output maximum load resistance: 600ohm

Is there a point I missed or suggestions? 

Are the p channel mosfet and pnp transitor I have used suitable? If you suggest a configuration that gives better results,it would be great.

Should I connect the cathode end of the schottky diode connected to the output directly to the vsp pin of the ic or should I connect it to the first part of the decoupling capacitors (sequentially connecting on pcb)?

Do I need to add a filter to the vin pin?

I want this circuit output to be very i want to replace it with this resistor, i will check the resistor's temperature coefficient again

RES SMD 2.5KOHM 0.01% 1/10W 0805 
or any suggests?