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How to set absolute values of resistor

Other Parts Discussed in Thread: DAC900

Hi.


I want to understand how to set absolute values of resistor in the circuit of attached file.

(This circuit is on the datasheet P.13 of DAC900)
The resistor is R1 and R2 (R3 and R4).
The value of Iout is 20mAp-p.

Why are these resistors 200ohm and 402ohm?

(I understand that R2/R1 = Gain.)
I think that these values of resistor are small.

Best Regards,

Kuramochi