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CC400-RTR2 数据表(PDF) 15 Page - Texas Instruments |
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CC400-RTR2 数据表(HTML) 15 Page - Texas Instruments |
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15 / 31 page  CC400 SWRS050 Page 15 of 32 Item Description C10 1 nF, X7R, 0603 C11 33 nF, X7R, 0603 C12 4.7 nF, NP0, 1206 C24 33 pF, NP0, 0603 C25 220 pF, NP0, 0603 C51 220 pF, NP0, 0603 C61 12 pF, NP0, 0603 C91 4.7 pF, NP0, 06035 C92 8.2 pF, NP0, 0603 C93 3.9 pF, NP0, 0603 C121 33 nF, X7R, 0603 C122 1.5 nF, X7R, 0603 C123 330 pF, NP0, 0603 C161 15 pF, NP0, 0603 C151 15 pF, NP0, 0603 C210 1 nF, X7R, 0603 C211 33 nF, X7R, 0603 L51 39 nH, 0805 L61 6.8 nH, 0805 L91 10 nH, 0805 R7 10 k Ω, 0603 (optional) R121 5.6 k Ω, 0603 R122 27 k Ω, 0603 R123 22 k Ω, 0603 VAR KV1837K, TOKO or similar XTAL 12 MHz crystal, 12 pF load Table 11: Bill of materials for the application circuit. 17. Receiver sensitivity The receiver sensitivity depends on which IF frequency and IF filter that has been selected (60, 200 or 455 kHz). It also depends on the data rate (0.3 – 9.6 kbps) and the FSK frequency separation (0 – 200 kHz). Frequency separation is twice the frequency deviation (for example, 20 kHz separation is +/-10 kHz deviation). Some typical figures are shown in Table 12. Data rate IF frequency Separation CC400 60 kHz 20 kHz -110 dBm 200 kHz 40 kHz -103 dBm 1.2 kbps 455 kHz ext 12 kHz -108 dBm 60 kHz 30 kHz -110 dBm 200 kHz 40 kHz -103 dBm 2.4 kbps 455 kHz ext 20 kHz -103 dBm 200 kHz 40 kHz -101 dBm 4.8 kbps 455 kHz ext 20 kHz -99 dBm 9.6 kbps 200 kHz 40 kHz -97 dBm Table 12: Sensitivity for different IF frequency, data rates and separation. In a narrow band system with very low frequency separation (less than 10 kHz) the sensitivity will drop. To insure proper operation the separation should always be larger than 5 kHz (+/- 2.5 kHz deviation). For even smaller separation, or to improve the sensitivity, an external narrow band demodulator should be used. See Application Note AN005 “Selecting system parameters and system configurations using CC400 / CC900” for more information on narrow band systems. |
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