The DAC and DDS of the AD9910 and AD9957 are similar, so you should be able to apply the AD9957 noise spectral density values to the AD9957.
i have evaluated the ad9957 eval board. Now i want to change usb firmware a bit .
i searched the forum and found ad9957 usb firmware AD9957 eval board, from Linux ，but it was not usb firmware. It is a driver.
how can i get ad9957 usb firmware source…
It is possible to synchronize multiple AD9957s (see the "Synchronization of Multiple Devices" section of the data sheet). If all the AD9957s are properly synchronized, then their PDCLK signals will also be synchronized.
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The AD9957 has the equilvalent interface verses the AD9910. I don't have firmware for the AD9910 but the AD9957 is attached.
The XTAL_SEL input on the AD9957 and AD9910 are identical, so DSB's posting with regard to the AD9957's XTAL_SEL pin applies to the AD9910, as well.
I used a 16.368MHz TCXO as the REF_CLK of the AD9957 evaluation board, but the TCXO output frequency was affected when AD9957 was under the QDUC mode.
Assuming the baseband signal is bandlimited to 1.536MHz when delivered to the AD9957, then the output signal should also occupy 1.536MHz. It is important to understand that the AD9957 does not alter the bandwidth of the input signal (with the exception…