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CC2540: CC2540 RF test data

Part Number: CC2540

1.Does TI has test data and results of RF performance of CC2540?It is mainly the test result of TI demo. I want to make comparison with my demo

2.I found in the test that the initial Freq Drift= -26.8khz is a bit high. What might be the reason

3.I see that the sensitivity test parameter of BLE is PER, and the standard is 30.8%. Why can this loss rate be allowed to be so high?  Doesn't BLE care about BER?  BER's standard seems to be 0.1%