The maximum input power of AD9361 is 2.5dBm, is it a peak value or average value?
It is a peak value.
The maximum rating is the damage level correct? Is there any sweet point of the input level that we can obtain the best performance? Or at some level the performance degrades dramatically?
The absolute maximum rating is correct.
The gain will adjust to accommodate different input levels. I would not say that performance sweet spot exists.
Rx signal chain IP1dB is approximately -65dBm at maximum gain. Gain range is 90dB. 1dB compression point is a function of frequency and programmed gain table. Rx input maximum single ended input signal amplitude is +2.5dBm (referenced to 50ohms).
The data sheet states the gain range is 0 to 74 dB, how did you get the additional 16 db of gain range to achieve 90dB. Is this gain of 90dB from the transmit gain range?
What frequency was the -65dBm 1 dB compression measured at? Is this information provided in the data sheets directly or based on the ADC max input limit of 0.625 V peak?
You are correct. The gain range is from a small attenuation value that varies over frequency up to about 70dB (which again varies over frequency). Values are specified in the datasheet. The gain range is about 74dB.
The part can be programmed with a table that holds 90 entries.
IP1dB is not specified in the datasheet. I would suggest measuring IP1dB point for your application using the exact part configuration on our evaluation platform.
The ADC maximum input (0 dBFS) is 0.625 V peak. However, to avoid compression the maximum recommended peak input level to the ADC is 0.5 V peak, which is 1.9 dB lower than full scale.
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