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PDF ( 数据手册 , 数据表 ) IA4420

零件编号 IA4420
描述 ISM Band FSK Transceiver
制造商 Interation
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IA4420 数据手册, 描述, 功能
www.DataSheet4U.com
IA ISM-AN6
heet4U.comAntenna Selection Guide for the
SIA4420 ISM Band FSK Transceiver
ata Application Note
.D Version 1.0r - PRELIMINARY
wwwIA ISM-AN6 Rev 1.0r 1205
www.DataSheet4U.com©2005, Integration Associates, Inc.







IA4420 pdf, 数据表
U.S. REGULATIONS: 915MHZ, 434MHZ
Tables 1.1, and 1.2 give the typical ideal free space ranges in meters for different antennas used in the TX and RX modules for the
U.S. 915 MHz and 434 MHz band, respectively. A bit rate of 9600 bit/sec and 57400 bit/sec and a BER of 10-2 was assumed during
this estimation.
The transmitted power is regulated by part 15 of the FCC standards (Note 1). It gives restrictions to the allowed field strength at 3 m
distances. The allowed field strengths are 50, and 11 mV/m at 915 and 434MHz, respectively. In case of spread spectrum
transmission the maximum allowed TX power is 1 W at 915 MHz, which can be achieved only with an external booster stage.
915 MHz U.S.
band
TX Xtapped Loop “small”
(see Figs. 2.3)
TX Xtapped Loop “big”
(see Figs. 2.4)
TX Back IFA (see Figs. 2.5)
RX Xtapped loop
“small” (see
Figs. 2.3)
9600 bps
57470 bps
78
9600 bps
174
9600 bps
41 57470 bps 92
57470 bps
469
249
RX Xtapped loop
“big”
(see Figs. 2.4)
9600 bps
57470 bps
184 9600 bps 413
123 57470 bps 276
9600 bps
57470 bps
1112
743
RX Back IFA
(see Figs. 2.5)
9600 bps
583
9600 bps
1306
9600 bps
3516
57470 bps
348 57470 bps 778
57470 bps
2094
Table 1.1 Free space range [m] in the 915 MHz U.S. unlicensed band (10-2 BER). The real indoor or outdoor ranges can be
calculated from this data using the calculation method of Appendix E of the IA-ISM-AN1 document.
Note 1: In an interference-free environment, the estimated ranges are approximately two times higher. In the case of non-ideal
propagation, the ranges can dramatically decrease (see Appendix E of the IA-ISM-AN1 document for details).
Note 2: For further details on FCC part 15, see “Understanding the FCC Regulations for Low-Power, Non-Licensed Transmitters,” by
the Federal Communications Commission, available through the FCC Web site, http://www.fcc.gov, or via Integration’s
Design Resources page at http://www.integration.com.
7







IA4420 equivalent, schematic
BER VS. RANGE CURVES FOR THE U.S. 915MHZ BAND (CONTINUED)
BER vs. distance at 915 MHz U.S. band in case of BIFA RX and
cross tapped loop "small" TX antenna at 9600 bps and 57470 bps
bit rates.
1.E-02
1.E-03
1.E-04
1.E-05
100
9600 bit/sec
57470 bit/sec
225 350 475
Distance (m)
600
Fig. 1.7.
BER vs. distance at 915 MHz U.S. band in case of BIFA RX and
cross tapped loop "big" TX antenna at 9600 bps and 57470 bps bit
rates.
1.E-02
1.E-03
1.E-04
1.E-05
300
9600 bit/sec
57470 bit/sec
575 850 1125
Distance (m)
1400
Fig. 1.8.
15










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