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MAX3542 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX3542 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 10 page 7) Install and run the MAX3541/MAX3542 control software. Software is available for download at www.maxim-ic.com/evkitssoftware. 8) Load the default register settings from the control software by clicking Edit: Load Defaults. 9) Connect the SMA connector labeled IF_OUT on the evaluation board to a spectrum analyzer or to an oscilloscope. 10) Enable the RF signal generator’s output. 11) Set the center frequency to the IF frequency set on the control software. Check the output. Gain Adjustment Calculations Add an additional 6dB to the voltage gain to account for the 2:1 transformer on the output. Add another 3.96dB to the voltage gain to account for the minimum loss pad (R10 and R11) on the input. When measuring noise figure, account for 5.7dB power loss of the mini- mum loss pad. A 36MHz IF anti-aliasing filter is provided on the EV kits (C9, C12, C21, C25, C28, C29, C31, C35, L3, L9, L10, and L11). Anti-aliasing filter requirements vary depend- ing on applications; users should consult their demodu- lator vendors for more specific information. Layout Considerations The MAX3541/MAX3542 EV kits serve as a guide for PCB layout. Keep RF signal lines as short as possible to minimize losses and radiation. Use controlled imped- ance on all high-frequency traces. The exposed pad must be soldered evenly to the board’s ground plane for proper operation. Use abundant vias beneath the exposed pad for maximum heat dissipation. Use abun- dant ground vias between RF traces to minimize unde- sired coupling. To minimize coupling between different sections of the IC, the ideal power-supply layout is a star configuration, which has a large decoupling capacitor at the central VCC node. The VCC traces branch out from this node, with each trace going to separate VCC pins of the MAX3541/MAX3542. Each VCC pin must have a bypass capacitor with low impedance to ground at the frequen- cy of interest. Do not share ground vias among multiple connections to the PCB ground plane. MAX3541/MAX3542 Evaluation Kits 4 _______________________________________________________________________________________ |
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