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Programming of ADF5901


we have constructed an 24Ghz Radar using ADF4159 ,ADF5901 and ADF5904. we have taken out (connected to a 3 pin connector) the Serial Communication pins for all the ICs and tried communicate with it using the NI-PXI controller. we have followed the same initialization sequence provided in the data sheet of ADF5901 page 23 but still we find that there is no response from the IC ADF5901. what we cab do now..?