Single-Chip Low Cost Low Power RF-Transceiver (Rev. B

CC25004.4 Crystal OscillatorTc = 25°C, VDD = 3.0 V if nothing else stated.Parameter Min Typ Max Unit Condition/NoteCrystal frequency 26 26 27 MHzTolerance ±40 ppm This is the total tolerance including a) initial tolerance, b) crystalloading, c) aging, and d) temperature dependence.The acceptable crystal tolerance depends on RF frequency andchannel spacing / bandwidth.ESR 100 ΩStart-up time 150 µs Measured on CC2500EM reference design ([4]) using crystalAT-41CD2 from NDK.This parameter is to a large degree crystal dependent.Table 7: Crystal Oscillator Parameters4.5 Low Power RC OscillatorTc = 25°C, VDD = 3.0 V if nothing else stated. All measurement results obtained using the CC2500EM reference design([4]).Parameter Min Typ Max Unit Condition/NoteCalibrated frequency 34.7 34.7 36 kHz Calibrated RC oscillator frequency is XTALfrequency divided by 750Frequency accuracy aftercalibration-1 /+10% The RC oscillator contains an error in thecalibration routine that statistically occurs in17.3% of all calibrations performed. The givenmaximum accuracy figures account for thecalibration error. Refer also to the CC2500Errata Notes.Temperature coefficient +0.4 % / °C Frequency drift when temperature changesafter calibrationSupply voltage coefficient +3 % / V Frequency drift when supply voltage changesafter calibrationInitial calibration time 2 ms When the RC oscillator is enabled, calibrationis continuously done in the background as longas the crystal oscillator is running.Table 8: RC Oscillator ParametersSWRS040B Page 13 of 92