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MCRF451 Folha de dados(PDF) 10 Page - Microchip Technology |
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MCRF451 Folha de dados(HTML) 10 Page - Microchip Technology |
10 / 50 page MCRF450/451/452/455 DS40232H-page 10 2003 Microchip Technology Inc. FIGURE 2-3: EXTERNAL CIRCUIT CONFIGURATION FOR MCRF451 FIGURE 2-4: EXTERNAL CIRCUIT CONFIGURATION FOR MCRF452 FIGURE 2-5: EXTERNAL CIRCUIT CONFIGURATION FOR MCRF455 Note: Substrate = V SS Internal Resonant Capacitor (Cres_100) = 95 pF L1: External Antenna Coil A L2: External Antenna Coil B Ant. A Ant. B L1 V SS L2 MCRF451 Int. Res. Cap. L1 > L2 ftuned 1 2π LT ()95 12 – ×10 ------------------------------------------------ = fdetuned 1 2π L1 ()95 12 – ×10 ----------------------------------------------- = LT = Total antenna inductance between Ant. A and VSS = 95 pF Ant. A Ant. B L V SS MCRF452 Internal Resonant Capacitor between Ant. A and V SS pads: C RES_2_50 + parasitic capacitor = 30 pF Note: Substrate = V SS ftuned 1 2π L ()30 12 – ×10 ------------------------------------------- = fdetuned 1 2π L ()50.6 12 – ×10 ------------------------------------------------ = Int. Res. Cap. = 30 pF 50.6 pF 65.4 pF Internal Resonant Capacitor (Cres_50) = 50 pF L1: External Antenna Coil A L2: External Antenna Coil B Ant. A Ant. B L1 V SS L2 MCRF455 ftuned 1 2π LT ()50 12 – ×10 ------------------------------------------------ = fdetuned 1 2π L1 ()50 12 – ×10 ----------------------------------------------- = LT = Total antenna inductance between Ant. A and VSS Note: Substrate = V SS L1 > L2 Int. Res. Cap. = 50 pF Note: See application notes AN710 and AN830 for antenna circuit design of Figure 2-2 through Figure 2-5. |
Nº de peça semelhante - MCRF451 |
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Descrição semelhante - MCRF451 |
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