Evaluates: MAX2679, MAX2679B MAX2679/MAX2679B Evaluation Kits General Description Benefits and Features The MAX2679/MAX2679B evaluation kits (EV kits) Easy Evaluation of MAX2679/MAX2679B IC simplify the evaluation of the MAX2679/MAX2679B GPS/ 1.08V to 1.98V Single-Supply Operation GNSS ultra-low current low-noise amplifier (LNAs). They RF Input and Output Matched to 50 enable testing of the devices RF performance and require no additional supporting circuitry. The EV kits provide 50 Fully Assembled and Tested SMA connectors for inputs and outputs. Ordering Information appears at end of data sheet. MAX2679 EV Kit Photo 319-100018 Rev 0 5/17Evaluates: MAX2679, MAX2679B MAX2679/MAX2679B Evaluation Kits 5) Enable the DC supply output. The supply current Quick Start should read approximately 1000A for MAX2679 EV The MAX2679/MAX2679B EV kits are fully assembled and kit and 650A for MAX2679B EV Kit. factory tested. Follow the instructions in the Connections 6) Enable the RF signal generator output. The spectrum and Setup section to test the devices. analyzer should display a tone at 1575.42MHz with Required Equipment power level at approximately -31dBm for MAX2679 This section lists the recommended test equipment EV Kit and -34dBm for MAX2679B EV Kit. to verify the operation of the MAX2679/MAX2679B. Checking Noise Figure The equipments listed are intended as suggestions and Note: It is highly recommended to measure noise figure inside substitutions are possible: a screen room or Faraday enclosure to avoid environmental MAX2679/MAX2679B EV kit noise from increasing the noise figure artificially. One DC power supply capable of delivering 10mA of 1) With the DC supply output disabled, connect a +1.8V current from +1.0V to 2.0V power supply to the VCC header and the power supply ground to the GND header of the EV kit (route One ammeter (optional) the positive terminal of the power supply through an One RF signal generator capable of producing 1GHz ammeter, if desired. to 2GHz (Agilent E4433B or equivalent) 2) Place a jumper between pins 2 and 3 on SHDNB One RF spectrum analyzer that covers the MAX2679/ (pin 1 closest to the RFOUT SMA port). MAX2679B operating frequency range (R&S FSEB20 3) Calibrate the noise figure meter per the instructions or equivalent) for that instrument. One RF power meter capable of measuring up to 4) Connect the noise head to the RFIN SMA connector 0dBm at 1575.42MHz (Agilent E4419B or equivalent) and the RFOUT SMA to the meter using a SMA cable. and one power sensor (HP 346A or equivalent) 5) Enable the DC supply output. One noise figure meter (optional) 6) Enable the noise figure measurement. The MAX2679 One network analyzer (optional) EV kit should measure approximately 0.95dB and the Connections and Setup MAX2679B should measure approximately 1.03dB. This section is a step-by-step guide to operating the EV Application Information Kit and its function. Printed Circuit Board (PCB) Design Caution: Do not turn on the DC Power or RF signal generators until all connections are completed. A properly designed PCB is essential to any RF microwave circuit. Use controlled-impedance lines on Checking Power Gain all high frequency inputs and outputs. Bypass VCC with 1) With the DC supply output disabled, connect a +1.8V decoupling capacitors located close to the device. For power supply to the VCC header and the power long VCC lines it may be necessary to add decoupling supply ground to the GND header of the EV kit (route capacitors. Locate these additional capacitors further the positive terminal of the power supply through an away from the device package. Proper grounding of the ammeter, if desired). GND bump is essential. If the PCB uses a topside RF 2) Place a jumper between pins 2 and 3 on SHDNB ground, connect it directly to the GND bump. For a board (pin 1 closest to the RFOUT SMA port). where the ground is not on the component layer, connect the GND bump to the board with multiple vias close to 3) With the RF signal generator output disabled, connect the package. For general layout guidelines, refer to www. the generator output to the RFIN SMA connector on maximintegrated.com/app-notes/index.mvp/id/5100. the EV kit through an SMA Cable. Set the output of the RF signal generator frequency to 1575.42MHz Refer to the MAX2679 EV kit schematic, Gerber data, and power level to -50dBm. PADS layout file, and BOM information for best practices. 4) Connect a spectrum analyzer to the RFOUT SMA connector on the EV kit through an SMA Cable. Set the spectrum analyzer center frequency to 1575.42MHz, reference level to 0dBm, and span to 1MHz. Maxim Integrated 2 www.maximintegrated.com