MCRF450 Просмотр технического описания (PDF) - Microchip Technology
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MCRF450 Datasheet PDF : 50 Pages
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MCRF450/451/452/455
FIGURE 2-3:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF451
Ant. A MCRF451
Int. Res. Cap.
L1
= 95 pF
VSS
L2 Ant. B
L1 > L2 Note: Substrate = VSS
Internal Resonant Capacitor (Cres_100) = 95 pF
L1: External Antenna Coil A
L2: External Antenna Coil B
ftuned
=
-----------------------1------------------------
2π (LT)95×10–12
fdetuned
=
-----------------------1------------------------
2π (L1)95×10–12
LT = Total antenna inductance between Ant. A and VSS
FIGURE 2-4:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF452
Ant. A MCRF452
50.6 pF
Int. Res. Cap.
= 30 pF
L
65.4 pF
VSS
Ant. B
Internal Resonant Capacitor between Ant. A and VSS pads:
CRES_2_50 + parasitic capacitor = 30 pF
ftuned
=
---------------------1----------------------
2π (L)30×10–12
fdetuned
=
-----------------------1------------------------
2π (L)50.6×10–12
Note: Substrate = VSS
FIGURE 2-5:
Ant. A
L1
L2 Ant. B
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF455
MCRF455
Int. Res. Cap.
= 50 pF
VSS
Internal Resonant Capacitor (Cres_50) = 50 pF
ftuned
=
-----------------------1------------------------
2π (LT)50×10–12
fdetuned
=
-----------------------1------------------------
2π (L1)50×10–12
LT = Total antenna inductance between Ant. A and VSS
L1 > L2 Note: Substrate = VSS
L1: External Antenna Coil A
L2: External Antenna Coil B
Note: See application notes AN710 and AN830 for antenna circuit design of
Figure 2-2 through Figure 2-5.
DS40232H-page 10
2003 Microchip Technology Inc.
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