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AD9781 output current

Question asked by nikhil on Mar 20, 2014
Latest reply on Mar 20, 2014 by nikhil

Hi,

 

We are using AD9781 on our board. Earlier we were using the default current outputs (20mA). We have 22 ohms resistor to ground for each P and N DAC outputs. Using this we were achieving around 450mV p-p on each line (P and N). But when we tried changing the output current using the DAC FSC registers (0x0B, 0x0C, 0x10 and 0x0F) we are not observing any change in the DAC output voltages. Are we missing anything regarding this? Changing the FSC registers should have increased/decreased the current and the voltage levels should have changed.

 

Thanks & Regards,

Nikhil

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