Current Steering DAC .. Resistor Values ?

[jonashat]

Well, if I'm to pick a value for the resistance given a load capacitance, I'd try to maximize the resistance while achieving the required speed.

You have two constraints to work with:

1) w3dB = 1 / (R Ctot) where Ctot is the sum of Cload (fixed) and Cpar (proportional with the size of the MOS transistors).

2) I * R = voltage step of the DAC.

 

[tarun_taurus]

boss depends on application..
for what application you wanna develop?

 

[hr_rezaee]

Hi
assume that the output current is constant
so if load is large then we have a large drop on resistor and may it cause that your dac switches or current source goes to triode region.
capasitance load and resistive load are a lowpass filter and can improve or degrade performance of dac depends on your signal and application.
regards