We are trying to create a setup for complex IQ base-band with AD9164.
It is seen that AD9164 has only one DAC so that we cannot use it right away for our complex IQ base-band.
Are there any information that can help us?
Analog Devices has I/Q dual DACs that might work better for you. Have you checked the AD9152 (2.5 GSPS Dual DAC) or the AD9136 (2.8 GSPS Dual DAC)? Both of those give you a dual DAC pair. Also, we have just announced the AD9172 (12 GSPS Dual DAC) and will release it shortly. You might find that part will do what you need.
Otherwise, if you wish to use the AD9164, you will need to configure two of them with multi-DAC sync. The procedure for this is described in detail in the data sheet.
My reading of the AD9164 datasheet is not as encouraging as the previous comment. There might be 2 issues to consider.
1) The deterministic latency of a single DAC operating as subclass 1 includes a tolerance of 4 DAC clock periods (page 41 under Deterministic Latency | Subclass 1 of Rev 0). I assume that means that 2 devices could be twice as far apart.
2) If the I&Q data is to be modulated on a carrier, the NCO phase relationship tolerance is +/- 6 DAC clocks (page 56 under NCO Reset). It is hard to believe that a quadrature phase can be established at each power-up or link establishment.
The AD9136 has a subclass 1 tolerance, but it doesn't get doubled when 2 channels are used. Also, the AD9136 quadrature phase is correct by design, as only one phase accumulator is being used.
Depending on the bandwidth and output frequency that you need, you can use the AD9164 and directly synthesize the RF output, using complex data as the input. Otherwise, yes, there is an initial phase offset after doing sub-class 1 synchronization. Please continue to follow the data sheet to learn the method to tune the DAC clock to align the last couple of clock cycles. This must be done externally to the chip and a part like the HMC7044 works very well for this purpose.
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