AFE7901: JESD data rate vs power consumption

Hi Franziskus,

I am still checking internally to see if there is any data to show the power consumption of the device vs JESD data rate.

However I wanted to expand on a couple of things. For power consumption to be minimum the number of SerDes lanes needs to be minimum. But also the higher the interface rate, the less DUC/DDC logic that needs to be used. Therefore, for minimal power consumption you would need to use the minimum number of SerDes lanes with the maximum interface rate that can be supported by that minimum number of lanes.

Since changing the lane rate will change either the LMFS, resolution or interface rate. This will also produce other changes in the device such as changing how much DUC/DDC logic is used, which will change the power consumption. Therefore we would suggest measuring the specific mode.

When using the AFE79xxEVM and Latte software you can use the 'PowerCard' to monitor the current on each of the rails. You can open the 'PowerCard' by double-clicking 'PowerCard’ in the Instrument List, picture is shown below.

With the PowerCard open you can press the ‘Get Currents’ button to receive the current measurement for each rail.

Best,

Camilo

Hi Franziskus,

I had reached out through email last week to propose the idea that if the customer has a mode in mind, we could take some data on the EVM using the power card to see the power consumption of the device and the current per rail. Because there is likely not additional data aside from the different modes highlighted in section "7.9 Power Supply Electrical Characteristics" of the datasheet.

If that would help, could you please provide us with the customers desired mode? We believe this to be more effective as the measurements will be in the customers desired mode.

Best,

Camilo