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AD7734EBZ EVAL board: software to set channel time, but graph shows weird.

Category: Software
Product Number: AD7734
Software Version: 1.3.70

Input 5KHz sine wave to channel-1

When I set channel time to 992us, the graph shows sine wave. See below

When I increased channel time to 1002us, the graph shows weird. What's the difference ?

It shows OK if channel time to 210.7us (chop disabled). How to calculate the relationship btw sampling rate, samples, freq....? Thanks.

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