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LM98640: ADC , AFE LM98640 Test condition

Part Number: LM98640

In LM98640 specifications datasheet ,we can find  test conditon of dynamic parameter "SNR" is "fs=5MHz" or  "fs=15MHz" or  "fs=25MHz"  or  "fs=40MHz" in S/H mode,but now I don't know what is Fin .