Hi peimin Wu, I tried to make it a little more clear on the plot below As you can see, at 500mV of compliance voltage the normalized current is closer to 0.92 for 250uA and 100uA (I am not sure where you are getting 200uA, unless you are planning on combining 2x100uA together) You should consider increasing the supply voltage to 5V, or reducing the resistance between the IDAC output and ground. These are the only ways to meet the compliance voltage spec -Bryan
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