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CC1050 Datasheet(PDF) 28 Page - Texas Instruments |
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CC1050 Datasheet(HTML) 28 Page - Texas Instruments |
28 / 40 page CC1050 SWRS044 Page 28 of 40 System Considerations and Guidelines SRD regulations International regulations and national laws regulate the use of radio receivers and transmitters. SRDs (Short Range Devices) for licence free operation are allowed to operate in the 433 and 868-870 MHz bands in most European countries. In the United States such devices operate in the 260–470 and 902-928 MHz bands. CC1050 is designed to meet the requirements for operation in all these bands. A summary of the most important aspects of these regulations can be found in Application Note AN001 SRD regulations for licence free transceiver operation, available from Chipcon’s web site. Low cost systems In systems where low cost is of great importance the CC1050 is the ideal choice. Very few external components keep the total cost at a minimum. The oscillator crystal can then be a low cost crystal with 50 ppm frequency tolerance. Battery operated systems In low power applications the power down mode should be used when not being active. Depending on the start-up time requirement, the oscillator core can be powered during power down. See page 21 for information on how effective power management can be implemented. Crystal drift compensation A unique feature in CC1050 is the very fine frequency resolution of 250 Hz. This can be used to do the temperature compensation of the crystal if the temperature drift curve is known and a temperature sensor is included in the system. Even initial adjustment can be done using the frequency programmability. This eliminates the need for an expensive TCXO and trimming in some applications. In less demanding applications a crystal with low temperature drift and low ageing could be used without further compensation. A trimmer capacitor in the crystal oscillator circuit (in parallel with C4) could be used to set the initial frequency accurately. High output power systems The CHP_OUT (LOCK) pin can be configured to control an power amplifier. This is controlled by LOCK_SELECT in the LOCK register. Frequency hopping spread spectrum systems Due to the very fast frequency shift properties of the PLL, the CC1050 is also suitable for frequency hopping systems. Hop rates of 1-100 hops/s are usually used depending on the bit rate and the amount of data to be sent during each transmission. The two frequency registers (FREQ_A and FREQ_B) are designed such that the ‘next’ frequency can be programmed while the ‘present’ frequency is used. The switching between the two frequencies is done through the MAIN register. Not Recommended for New Designs |
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