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データシートサーチシステム |
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データシートサーチシステム |
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MRF49XA-I/T データシート(PDF) 73 Page - Microchip Technology |
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MRF49XA-I/T データシート(HTML) 73 Page - Microchip Technology |
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73 / 102 page  © 2009-2011 Microchip Technology Inc. Preliminary DS70590C-page 73 MRF49XA 4.0 APPLICATION DETAILS The application circuit of MRF49XA with a balun circuit is shown in Figure 4-1. FIGURE 4-1: APPLICATION CIRCUIT 4.1 Antenna/Balun A balun circuit for a 50 Ω antenna is shown in Figure 4-2. If low tolerance components (i.e., ±5%) are used with an appropriate ground, the impedance remains close to the 50 Ω measurement. FIGURE 4-2: BALUN CIRCUIT 1 2 3 4 16 15 14 13 12 11 10 9 5 6 7 8 RC 7 RC6 RC 5 RC4 RC3 RC2 RC 1 RC0 OSC 1 PIC ® MC U C4 * 2 .2 nF C1 2.2 u F V DD C3 0.01 uF C2 (see Table 2-2) 50 O h m Lo op An te n n a X1 10 M H z * C o n n e ction s are o p tiona l. MC L R __ __ _ SDI SCK SD O RCL K O UT /F CA P /F INT * CL K O U T * Ba lu n IN T /D IO * IR O CS F SK/D A T A /F S E L * RE SE T * +3.3V C5 C6 50 Ω ANT J1 L1 L2 L3 RFN RFP Freq. L1 L2 L3 C5 C6 C7 433 MHz 390 nH 33 nH 47 nH 68 pF 2.7 pF 5.1 pF 868 MHz 100 nH 8.2 nH 22 nH 1.2 pF 27 pF 2.7 pF 915 MHz 100 nH 8.2 nH 22 nH 1.2 pF 27 pF 2.7 pF C7 |
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