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
I am also wondering the same thing. Anyone have any answers?
I have the same question.
In reply to Jim Gavin:
The calibration is done to make the PLL lock to the programmed RF frequency (i.e get the correct VCO current, VCO capacitance and charge pump current). If there is no significant change in temperature (e.g more than +/-20C) or supply voltage there is no need to do a re-calibration.
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