Hello,We plan to design a board with two AD9789 DACs to get 8 RF channels.Data will come from a single Xilinx Spartan-6 FPGA.
Is it possible to drive both AD9789 with a single ADF4350 clock generator or do we need two ADF4350, one for each AD9789?
You can use both ADF4350 outputs to clock two different AD9789s.
I would also like to make you aware of another ADI device called the LTC6951 that could be used also.
There are two advantages of the LTC6951 over the ADF4350
1) improved jitter performance, which will improve lead to a lower DAC output noise floor. With a 10M ref, the ADF4350 has ~360fs jitter vs the LTC6951 with 175fs jitter.
2) The LTC6951 has 5 outputs, so you could use the extra outputs for other clocks/frequencies (i.e. FPGA clocks)
With that being said the ADF4350 is lower power from a single 3.3V supply. Where the LTC6951 will burn more power and requires a 3.3V and a 5V supply. So there are trade-offs.
Hi Chris,Many thanks for these useful advices!We are going to look to the LTC6951.Jean-Claude