high-precision PWM to current converter

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hi everyone,

i arduino mega act reliable controllable (linear) current source. easiest way, figured, use pwm of arduino , somehow convert constant current.
 
the pwm switches @ 490 [hz] , outputs 5 [v]. current source should have range of @ least 0 [ma] 20 [ma].

 i've found off-the-shelf converter (click here), costs €220,- , way expensive.

i try build pwm (analog) voltage converter , connect voltage-controlled-current-source. problem foresee it's not accurate enough, , need able control output current precisely.

are there standard (cheap) ic's solving problem or need build customized circuit?
any @ appreciated.

why not use this , use this set reference voltage (shown pot in schematic) ?


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