ADS62P22: Explanation of digital ramp and toggle pattern

Hello Chris,

I have notified our ADS62P22 expert regarding your question. He will provide a more detailed response soon.

Best regards,
Vijay

Chris,

The toggle pattern will toggle all of the bits to 0 then 1 then 0  then 1 and so on. The digital ramp will start at 0 then increment the output by 1 count and repeat once it reaches full count.

Regards,

Jim   

Okay, so the expected hex output of the toggle pattern should be alternating between 0x000 and 0xFFF?

I'm observing switching between 0xAAA and 0x555, which does have every bit toggling, but with alternating patterns of every other bit being turned on.

Chris,

For the first one, yes. For the second one, you are correct. The data toggles between 0xAAA and 0x555. My mistake.

Regards,

Jim

Just to clarify: are you saying there are two test patterns, one that outputs 0x000/0xFFF, and a second that outputs 0xAAA/0x555?

Or, is there just one toggle pattern, that only outputs 0xAAA/0x555?

Great, thank you for clarifying.

One last thing: when does the output switch between patterns? How does the output transition line up with respect to the sampling clock or CLKOUT signals?

I'm trying to use the multiplexed output mode, so the timing information is important to distinguish between the A and B channels on the rising/falling edges.