參數(shù)資料
型號(hào)： MRF24J40
廠商： Microchip Technology Inc.
英文描述： IEEE 802.15.4⑩ 2.4 GHz RF Transceiver
中文描述： IEEE 802.15.4標(biāo)準(zhǔn)⑩2.4 GHz射頻收發(fā)器
文件頁(yè)數(shù)： 49/66頁(yè)
文件大?。?/td> 748K
代理商： MRF24J40
2006 Microchip Technology Inc.
Advance Information
DS39776A-page 47
MRF24J40
APPENDIX A:
LAYOUT AND PART
SELECTION
A.1
Layout Considerations and RF
Measurements
Below is an example of the circuit diagram of a balun.
A balun is the impedance transformer from unbalanced
input of the PCB antenna and the balanced input of the
RF transceiver (pins RFP and RFN).
Figure A-2 shows the measured impedance of the
balun where the center of the band is very close to 50
Ω
.
When using low tolerance components (i.e., ±5%)
along with an appropriate ground, the impedance will
remain close to the 50
Ω
measurement. Figure A-3
shows the measured impedance of the PCB antenna
using a logarithmic scale magnitude. Figure A-4 shows
the same impedance using a Smith Chart diagram and
Figure A-5 using a voltage standing wave ratio.
FIGURE A-1:
EXAMPLE CIRCUIT DIAGRAM
FIGURE A-2:
MEASURED IMPEDANCE
ANT
0.3 pF
—
L1
4.7 nH
0.5 pF
C38
0.5 pF
L3
5.6 nH
C43
0.5 pF
C40
100 nF
0.5 pF
RFP
RFN
10 nH
10 nH
C7
C23
L4
C37
L5
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參數(shù)描述
MRF24J40_08 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4? 2.4 GHz RF Transceiver
MRF24J40_10 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4a?￠ 2.4 GHz RF Transceiver
MRF24J40-I 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:IEEE 802.15.4⑩ 2.4 GHz RF Transceiver
MRF24J40-I/ML 功能描述:射頻收發(fā)器 2.4 Ghz IEEE/ZigBee RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray
MRF24J40-I/ML 制造商:Microchip Technology Inc 功能描述:ZIGBEE Transceiver IC
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