I guess that I am not the first one to ask this question., what if pll2_vco_diff_m1 set to 2? ( We also tried setting it to 1. as a result, it breaks setup)
Here is what we have seen, setting it to 2 when in no OS example both ADC and DAC have 1Ghz sample rate, it still works and link clock appears to be 250mhz and correct.
As known, pll2_vco_diff_m1 is allowed to be 3,4,5. Having tried it set to 2, it is getting interesting.
when it is set to 3, master clock becomes 1Ghz. When it is set to 2, is master clock becoming 1.5Ghz or it is forced/ignored back down to 1Ghz?
It is useful for us if pll2_vco_diff_m1 set to 2 still is a valid setup?
Your comments are very appreciated!
Hi James,Please download the AD9523-1 evaluation software. This will get you faster to the desired rates. Andrei
Many thanks for your reply. Please forgive me about not mentioning how we use AD9523 on DAQ2 above?
We have DAQ2 and ZCU102. We are running example fpga design and no-OS driver provided Analog Devices. In no-OS driver, there are a list of parameters which are used to configure AD9523. parameter pll2_vco_diff_m1 is given to control master clock.
Above link explains how AD9523 works on DAQ2. It is difficult for us to see how we can use evaluation software in our setup. (My apologies if I misled you at first place without mentioning how we use AD9523 on DAQ2.)
Given our hardware setup, what if pll2_vco_diff_m1 is set to 2, will AD9523 be able to give a valid higher clock speed?
There is the DAQ3, which is very similar but can go up to ~1.23 GSPS.
What kind of setup are you looking for? DAC and ADC, or just one of them. What are the minimum samplerates you need.
We are looking for DAC and DAC modules which allows up to 2Ghz signal useable bandwidth. At minimum 125Mhz sample rate is required..
Could you clarify what you mean by 2 GHz signal usable bandwidth and 125 MHz sample rate? At a samplerate of 125 MHz your digital bandwidth would be well below the 2 GHz. Do you want to digitize a signal with 125 MHz bandwidth that could be placed anywhere from 0 to 2 GHz?
Having looking at spec of daq3 which appears to be one step up compared with daq2.
My apologies if I confused you.
Ultimately what we want is a reconfigurable DAC and ADC and allow us to change from a signal with 125mhz bandwidth to a signal with 2Ghz bandwidth.
ad9144 has sample rate upto 2.8Ghz but it has to work with interpolation. Without interpolation, maximum ~1066mhz sample rate.
In other words, we are looking for ADC and DAC which has sample rate upto 2Ghz without interpolation.
Currently we do not have a board available with both a DAC and an ADC that can go up to 2 GHz without interpolation/decimation. There are individual evaluation boards for DACs and ADCs that would meet the requirement For example a AD9172 or AD9164 board for the DAC and a AD9689 or AD9625 for the ADC, depending on the number of channels you need.