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connecting input of ADCMP565 to DDS AD9834

Question asked by digital_turtle on Nov 4, 2015
Latest reply on Nov 18, 2015 by digital_turtle

dear all,

 

i have a project which required to feed the output of ADS9834 to input of high speed opamp ADCMP565..

in ADCMP565 datasheet, it was recommended to apply parallel resistor 50ohm to opamp input (in sample circuit diagram)..

however when i do this, it seems that the output of DDS cannot drive such a high current and therefore the voltage is dropped at the input of opamp..

is it possible if i reduce the parallel resistor?

 

thank you

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