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AM-TX1-433 Folha de dados(PDF) 2 Page - rfsolutions.ltd |
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AM-TX1-433 Folha de dados(HTML) 2 Page - rfsolutions.ltd |
2 / 3 page DS012_1 Oct 00 ©2000 REG No 277 4001, ENGLAND. Page 2 AM RF TRANSMITTER MODULE. AM-TX1-XXX Operation The application circuit shows how to drive the module. The module may be driven from either a current source or current sink. In both cases the dropper resistor is required to set the drive current. The maximum and minimum drive voltage for various dropper resistor values is shown below. For other voltages between 2.5 - 13.1V the values may be calculated using the following formula Min Rd = ( Max drive Voltage - 3 ) / 0.0046 The minimum drive voltage for a given resistor value may then be calculated as; Min drive Voltage = 2.2 + .003 * Rd Example: The max drive voltage is 5.5V. The min Rd is therefore 543 Ω. The nearest preferred value above this is 560 Ω. The min drive voltage with 560 Ω is 3.86V. ANTENNAS Two types of antenna may be used, a tuned loop, or a short whip. The tuned loop should be driven directly from the module. The whip should be driven via the specified tuning network. The module is not type approved for use with a 1/ 4 wave or helical type antenna. MECHANICAL DETAILS Width = 7mm, Height = 11.5mm, thickness: 4.5mm. Lead Pitch 5.08mm. +ve connection is shown by marking on body side The tuned loop Ant is constructed from wire of 1-1.5mm DIA, or PCB track of 1.5-2.5mm width. The enclosed area of the loop shall not exceed 700mm2. The trimming capacitor should be used to tune the ant for max output. A 1.5 - 5pF cap is generally adequate. The short whip ant is constructed from a wire rod or PCB track of 90mm length. The 15nH inductor may be an SOIC component on the PCB, or an air cored solenoid of 0.8mm inside DIA, close wound with 9 turns of 0.56mm. The trimming capacitor should be used to tune the ant for max output. A 1.5 - 5pF cap is generally adequate. Max 700mm2 1-5pF RF Ground ~ Tuned Loop Antenna 1 1-5pF 90mm MAX ~ RF Ground Short Whip Antenna +ve Side 11.5mm 5.08mm 4.5mm 7.5mm |
Nº de peça semelhante - AM-TX1-433 |
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Descrição semelhante - AM-TX1-433 |
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