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MAX3509EVKIT Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX3509EVKIT Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page MAX3509 Evaluation Kit _______________________________________________________________________________________ 5 where: VNOISE = MAX3509 output noise in dBmV measured in a 160kHz bandwidth PNOISE = Noise density in dBm/Hz read from the spec- trum analyzer GAMP = Gain of the postamplifier in dB If the spectrum analyzer being used does not have a noise marker function, corrections must be made to account for the IF bandwidth used to make the mea- surement. Consult the user’s manual for your spectrum analyzer for details. Once the correction is made, the value read from the spectrum analyzer can be convert- ed to a noise density (dBm/Hz), and the above formula can be used. Noise can now be measured at various gains. Output noise in transmit-disable mode is insignificant. Layout Considerations The MAX3509 evaluation board can serve as a guide for your board layout. Particular attention should be paid to thermal design and to the output network. The MAX3509 package exposed paddle (EP), labeled GND2, conducts heat out of the part and also provides a low-impedance electrical connection. The EP must be attached to the PC board ground plane with a low ther- mal and electrical impedance contact. Ideally, this would be provided by soldering the backside package contact directly to a top metal ground plane on the PC board. Alternatively, the EP could be connected to a ground plane using an array of plated vias directly below EP. The EV kit incorporates both of these meth- ods. The output circuit that connects OUT+ and OUT- (pins 16 and 17) to the output transformer (T2) should be as symmetrical as possible to reduce second-order distor- tion. In addition, the inductance of this path should be kept low to minimize gain rolloff at high frequencies. Component Suppliers Note: Please indicate that you are using the MAX3509 when contacting these suppliers. SUPPLIER PHONE FAX AVX 803-946-0690 803-626-3123 M/A-COM 978-442-5000 978-442-4178 Murata 814-237-1431 814-238-0490 Coilcraft 847-639-6400 847-639-1469 |
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