i read the schematics , but i have a problem measuring the output of DDS using a spectrum analyser, for now i am not using the PLL multiplier ( i have disabled the multiplier and directly connected the crystal to AD9910)
there are two pins for output on the evaluation board
1) filtered Iout (j4 pin)
2) unfiltered Iout (j3 pin)
both are current outputs , can i directly connect the output to spectrum analyzer for measuring the spectrum or do i need to connect any resistor before connecting to spectrum analyser,
if i need to connect a resistor what kind of resistor do i have to use?