AD9209 Core Synchronisation

Hi,

Apologies for the delayed reply, but we missed your thread somehow.

Manikandan_M_M said:

Would you please share the guidelines for both Hardware as well as RTL Perspective

For this, you should ask on the Mixed-Signal Front Ends (MxFE) forum.

Manikandan_M_M said:

Could you share the Excel for calculating the Variable and Lane Delay of the Link

To my knowledge, we don't don't have such a file.

Manikandan_M_M said:

Do I have to Length Match the Device Clock and SYSREF to the Logic Device

Yes.

Manikandan_M_M said:

is there any requirement that the Sysref shall be continuous signal not the Single-shot Pulse

No, it can be either of them.

One way of synchronizing two devices can be seen here and another one where we show 4 devices here.

Best regards,
Iulia

Thanks for the info.

Could you please share the Latency Calculator

As I mentioned, I am not aware of such a thing, so please ask in the Mixed-Signal Front Ends (MxFE) forum.

The spreadsheet is not user friendly, but we can get you an estimate if you send your full configuration parameters.   

Info needed:

• JESD mode(JTx and JRx)
• Decimation/interpolation modes
• Any optional features enabled?
• Converter sample rate

JTx shall be used

Decimation - x18

Complex NCO - 900MHz

IQ data rate - 200MSPS

All four Channels shall be used

Fs -3600MHz

All 8 Lanes shall be occupied

Hello, sorry for the delayed response.  By "JESD Mode" I mean I need to know which of the many modes available in the user guide's mode tables you want to use as well as if you plan on using 204B or  a 204C mode.  If the mode must use 8 lanes and must have x18 decimation, that narrows it down to the following:

• 204B modes: 16.00 or 16.10
• 204C modes: 17.00 or 17.10 

Please check those modes in the mode tables (tables 70 and 76) to see if they meet your needs.  Let me know which one is best for you and I can get the latency estimates for you.  If you can also use fewer lanes, more options are available.

Del

Hello, sorry for the delayed response.  By "JESD Mode" I mean I need to know which of the many modes available in the user guide's mode tables you want to use as well as if you plan on using 204B or  a 204C mode.  If the mode must use 8 lanes and must have x18 decimation, that narrows it down to the following:

• 204B modes: 16.00 or 16.10
• 204C modes: 17.00 or 17.10 

Please check those modes in the mode tables (tables 70 and 76) to see if they meet your needs.  Let me know which one is best for you and I can get the latency estimates for you.  If you can also use fewer lanes, more options are available.

Del

204B - > JMODE-16.10

Here is the latency estimate:

Also, let me know if any of you other questions remain unanswered.

Hi deljones, Thanks for the data regarding latency. 

I have one more Question.  Is AD9209 is a 12-Bit ADC or 16-Bit ADC. As per dataheet, it is Quad 12-bit ADC, But as per user Guide, both N and NP are 16-bits

Yes, decimation will increase the SNR. Could you please share article regarding he method used for conversion of 12-bit to 16-bit

The ADC's are 12 bits.  However, when using the decimation block (even if decimation is set to 1). filtering is applied and the output will be 16-bits when the samples get to the JESD block.  This filtering results in better noise performance.

Could you please share the latency estimate for the below mode configuration. IC - AD9209

Hi,

Please open a new thread with these details, on the High-Speed ADCs forum.

Best regards,
Iulia