Synchronization problems between input signal and reference signal of AD8333

Question

Hello, 
 I'm so sorry to bother with you. I want to use I/Q demodulator AD8333 to process my signal. But I'm having a lot of trouble in synchronization even if I look at the datasheet, especially input/excitation signal and the reference signal are not from the same signal generator, as shown in the fig below, that's how can I make sure reference signal along with input signal is synchronized? I understand that the reference frequency in 4LON pin of AD8333 is four times the frequency of the input signal. The reference pin 4LON divided by 4 and input/excitation should have a 0 phase difference approximately. 
 In addition, if I take other approaches such as DDS to generate a reference and an excitation/input at the same time instead of two separate signal generators, is it feasible? 
 Eagerly await your early reply!

PoornimaSubramani · Accepted Answer

Hi, 
 The RSET pin is used to synchronize the LO dividers in AD8333 arrays.Please refer attached AD8333_Final_Approval.pdf Synchronization of multiple AD8333s can be checked as follows: 1. Set the phase code of all AD8333 channels to the same setting, for example, 0000. 2. Apply a test signal to a single channel that generates a sine wave in the baseband output, and then measure the output. 3. Apply the same test signal to all channels simultaneously, and then measure the output. 
 And also refer here https://ez.analog.com/amplifiers/f/q-a/15060/simulating-ad8333/126912#126912 
 AD8333_Final_Approval.pdf 
 
 Thanks, 
 Poornima)

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Synchronization problems between input signal and reference signal of AD8333