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hi davood ! I think it is possible. One way I got is to connect the o/p of first dac to the reference of second D/A and o/p of second D/A to reference of third and take final o/p from the third one.
But is there any other effective cost utilisation method ?
sorry, i mistake on reading D/A and think it is A/D!
you can use resistor divider by 256 for second and (65536) for 3rd DAC and summing 3 DAC result.
but i think it has severe accuracy and linearity problem.