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CC1050DK-868 Datasheet(PDF) 9 Page - Texas Instruments |
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CC1050DK-868 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page CC1050 SWRS044 Page 9 of 40 Application Circuit Very few external components are required for the operation of CC1050. A typical application circuit is shown Figure 2. Component values are shown in Table 1. Output matching C1, C2 and L2 are used to match the transmitter to 50 Ω. See Output Matching p.24 for details. VCO inductor The VCO is completely integrated except for the inductor L1. For further details see p. 17. Component values for the matching network and VCO inductor are easily calculated using the SmartRF ® Studio software. Crystal oscillator C3 and C4 are the loading capacitors for the crystal. See page 26 for details. Additional filtering Additional filtering (e.g. a low pass LC- filter) may be used in order to reduce the harmonic emission. See also Optional LC Filter p.27 for further information. Power supply decoupling and filtering Power supply decoupling and filtering must be used (not shown in the application circuit). The placement and size of the decoupling capacitors and the power supply filtering are very important to achieve the optimum performance. Chipcon provides a reference design (CC1050EB) that should be followed very closely. Figure 2. Typical CC1050 application circuit LC filter 11 12 RF_OUT AGND AGND AGND L1 AVDD L2 R_BIAS CHP_OUT AGND PALE PDATA PCLK DCLK DI DVDD DGND AGND XOSC_ Q1 AGND XOSC_ Q2 AVDD L1 1 3 2 4 5 6 8 9 10 7 24 23 22 20 21 19 18 17 15 14 13 16 C4 C4 C3 C3 Antenna (50 Oh m) AVDD=3V DVDD=3V Optional XTA L XTA L NC L2 C1 C2 AVDD=3V R1 DGND AVDD Not Recommended for New Designs |
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