Category: Hardware
Product Number: AD9901
I'm working on a PLL design with AD9901, GPS 10KHz reference signal, and 10MHz cristal ocxo divided by 1000 as VCO.
I'm having trouble gettimg AD9901 to lock. I'm just getting a 500mV maximum output from it. All signals are TTL. I have researched and there's almost no literature or examples of use. GPS' logic one is roughly 2.2V, could that be a problem? Behaviour is erratic, sometimes I get that 200mV signal and sometimes nothing. It was supposed to deliver at least 3.2V
Any suggestions? I even tried to inject two square signals, 50% duty cycle, 0° phase offset from an AWG, with no sucess
