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ONET2804T: Application

Part Number: ONET2804T

My customer used our TI-TIA ONET2804T in their ROSA, when they test RSSI, they got split in different voltage input, please check the plot:

It was tested in Rrssi at 10kohm: (marked red in the second figure), his questions are:

1: why there are splits in the RSSI at different voltage

2. at what value we should set the Rrssi for the best performance, means close to ideal and no split.

Thanks.