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LTC2662 Load limitation

Hello, my name is Ihsan.

Is there any limitation in the load that is connected to LTC2662 output?  Because when I increase the load value from 100Ω to 1000Ω, the transfer function of the output is changed.

For Example:

VDD= 32V and bit command= 2184 

with 100 Ω we get 9.728 mA.

with 1000 Ω we only get 7.578 mA.

I don't really understand what caused this.

Thank you