AD9172

Question

hi, 
 I'm studying how to use the AD9172. 
 Please tell me some questions. (sorry for the rudimentary question.) 
 1. I don't understand what M(JESD204B param,the converter count (M) ) means? What is the relationship with DAC. 
 2. I want use JESD mode 8, main x4 interpolation Dual-link. After configuration according to the startup sequence, the DAC has no output. 
 PLL locked, JESD linkup. 
 thanks.

ADIApproved · Accepted Answer

hi, 
 yes, I meant JESD errors. The errors I am referring to are on page 50 under the title "CGS, Frame Sync, Checksum, and ILAS IRQs" are you getting any of those errors. 
 also, another thing to confirm is that the FPGA JESD settings are the same. 
 1- One way to confirm that is to use the "Configuration Mismatch Flags". We have a section in the datasheet on page 50 called "Configuration Mismatch IRQ" that checks if the FPGA and the AD9172 are setup with the same parameters when it comes to the JESD link. I would follow that section to ensure proper FPGA settings. 
 2- you can use PHY PRBS testing where you send a PRBS pattern from the FPGA to the AD9172 and see if the AD9172 receive the pattern. this ensures that the lanes have no errors are connected correctly. There is a section in the datasheet about that. it is on page 47 under "PHY PRBS Testing" title. 
 -Mahmoud)

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Products Mentioned

AD9172