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problem to create square wave output with AD9783

Question asked by happyge2me on Nov 14, 2013
Latest reply on Nov 15, 2013 by Tguy

I want to output a square wave with AD9783, the high level time is 3us, sampling rate is 200MHz, but the output watched on the 50ohm resistors follow the DAC attenuates exponentially during high leve . These resisitors are connected directly with DAC, no capcitor is in the circuit, what's the problem?