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MICRF112 Datasheet(PDF) 27 Page - Microchip Technology |
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MICRF112 Datasheet(HTML) 27 Page - Microchip Technology |
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27 / 46 page  MICRF112 Application Information Data Sheet © 2024 Microchip Technology Inc. and its subsidiaries DS70005554A - 27 7. Application Information Figure 7-1. ASK 433.92 MHz and 315 MHz (MSOP) Note: Values in parenthesis are for 315 MHz. The MICRF112 is ideal for driving a 50Ω source monopole or a loop antenna. The above figure is an example of a loop antenna configuration. It also illustrates both 315 MHz and 433.92 MHz ASK configurations for a loop antenna. In addition to using a different crystal, modified values are needed for certain frequencies. These are listed in the following table. Table 7-1. Modified Frequency Values Frequency (MHz) L1 (nH) C5 (pF) L4 (nH) C7 (pF) Y1 (MHz) 315.0 470 10 150 4.7 9.84375 433.92 470 10 82 3.9 13.5600 The reference design illustrated in Figure 7-1 has an antenna optimized for using the matching network, as described in the above table Power Control Using an External Resistor R7 is used to adjust the RF output levels that may be needed to meet compliance. As an example, Table 7-2 and Table 7-3 list typical values of conducted RF output levels and corresponding R7 resistor values for the 50Ω test board shown in the Test Circuit. Table 7-2. ASK Output Power at 1 Kbps (Manchester) vs. External Resistor at 315 MHz R7, Ω Output Power, dBm IDD, mA 0 10 6.7 75 8.5 6.3 100 8.0 6.2 500 1.6 4.13 1000 -3.8 4.87 Table 7-3. ASK Output Power at 1 Kbps (Manchester) vs. External Resistor at 433.92 MHz R7, Ω Output Power, dBm IDD,mA 0 8.68 7.5 75 8.34 7.33 100 8.02 7.3 500 4.34 6.3 1000 0.42 5.5 |
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