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CC1070 Datasheet(PDF) 26 Page - Texas Instruments |
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CC1070 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 57 page  CC1070 SWRS043 Page 26 of 58 12.4 TX Data Latency The transmitter will add a delay due to the synchronization of the data with DCLK and further clocking into the modulator. The user should therefore add a delay equivalent to at least 2 bits after the data payload has been transmitted before switching off the PA (i.e. before stopping the transmission). 12.5 Reducing Spurious Emission and Modulation Bandwidth Modulation bandwidth and spurious emission are normally measured with the PA continuously on and a repeated test sequence. In cases where the modulation bandwidth and spurious emission are measured with the CC1070 switching from power down mode to TX mode, a PA ramping sequence could be used to minimize modulation bandwidth and spurious emission. PA ramping should then be used both when switching the PA on and off. A linear PA ramping sequence can be used where register PA_POWER is changed from 00h to 0Fh and then from 50h to the register setting, which gives the desired output power (e.g. C0h for +5 dBm output power at 868 MHz operation). The longer the time per PA ramping step the better, but setting the total PA ramping time equal to 2 bit periods is a good compromise between performance and PA ramping time. 13 Output Matching and Filtering When designing the impedance matching network for the CC1070 the circuit must be matched correctly at the harmonic frequencies as well as at the fundamental tone. A recommended matching network is shown in Figure 14. Component values for various frequencies are given in Table 15. Component values for other frequencies can be found using the SmartRF® Studio software. It is important to remember that the physical layout and the components used contribute significantly to the reflection coefficient, especially at the higher harmonics. For this reason, the frequency response of the matching network should be measured and compared to the response of the Chipcon reference design. Refer to Figure 15 and Table 16 as well as Figure 16 and Table 17. A recommended application circuit is available from the Chipcon web site (CC1070EM). Item 433 MHz 868 MHz 915 MHz C2 2.2 pF, 5%, NP0, 0402 1.5 pF, 5%, NP0, 0402 1.5 pF, 5%, NP0, 0402 C3 5.6 pF, 5%, NP0, 0402 10 pF, 5%, NP0, 0402 10 pF, 5%, NP0, 0402 C60 220 pF, 5%, NP0, 0402 220 pF, 5%, NP0, 0402 220 pF, 5%, NP0, 0402 C71 4.7 pF, 5%, NP0, 0402 3.3 pF, 5%, NP0, 0402 3.3 pF, 5%, NP0, 0402 L2 22 nH, 5%, 0402 6.8 nH, 5%, 0402 6.8 nH, 5%, 0402 L70 47 nH, 5%, 0402 12 nH, 5%, 0402 12 nH, 5%, 0402 L71 47 nH, 5%, 0402 12 nH, 5%, 0402 12 nH, 5%, 0402 R6 82 Ω, 5%, 0402 82 Ω, 5%, 0402 82 Ω, 5%, 0402 Table 15. Component values for the matching network described in Figure 14 (DNM = Do Not Mount). |
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