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CC2500 frequency synthesizer calibration

Hi,

The datasheet of cc2500 mentions that the 'frequency synthesizer must be calibrated regularly'.It does not mention how often. The chip can be set for auto calibration on entering/leaving RX/TX modes from IDLE states. If i need to put chip in TX mode always this autocalibration will not occur. I do not want to set the chip to IDLE state after each packet which  would require me to enter TX state every time i want to transmit some data.

I need to know how often this need to be calibrated if i want only TX and want to leave it in TX mode. 

Also I would like to know why this need to be calibrated often even though there is a PLL and an external crystal. 

or am i missing something here ? I don't need to change channels while operating 

 

 

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