Evaluates: MAX2769 MAX2769 Evaluation Kit General Description Quick Start The MAX2769 evaluation kit (EV kit) simplifies evaluation The MAX2769 EV kit includes two on-board MAX8510 of the MAX2769 universal GPS receiver. It enables linear regulators for powering up the MAX2769 device to a testing of the device performance and requires no additional regulated supply voltage of +2.85V. When using the linear support circuitry. Standard 50 SMA connectors are regulators, connect pins 1-2 of jumpers W16 and W17. included on the EV kit for the inputs and outputs to allow The MAX2769 can also be powered directly through an for quick and easy evaluation on the test bench. The external power supply through pin 2 of the jumpers (see evaluation kit is fully assembled and tested at the factory. Figure 1 for details). This document provides a component list, a list of equipment Required Test Equipment required to evaluate the device, a straightforward test This section lists the recommended test equipment to procedure to verify functionality, a description of the EV kit verify operation of the MAX2769. It is intended as a guide circuit, the circuit schematic, and artwork for each layer of only and some substitutions are possible. the printed circuit board (PCB). One RF signal generator capable of delivering at least +5dBm of output power at the operating frequency Features (e.g., HP E4433B or equivalent) Easy Evaluation of the MAX2769 IC An RF spectrum analyzer that covers the MAX2769 +2.7V to +3.3V Single-Supply Operation operating frequency range (e.g., FSEB20, or equivalent) 50 SMA Connector on the RF Ports and for the A power supply capable of up to 1A at +2.7V to +6V Baseband Outputs One ammeter for measuring the supply current All Critical Peripheral Components Included (optional) Parallel Port for 3-Wire Interfacing 50 SMA cables PC Control Software Available Upon Request A network analyzer (e.g., HP 8753D or equivalent) to measure small-signal return loss (optional) A dual power supply capable of delivering up to 1A Ordering Information at 5V PART TYPE A user-supplied IBM-compatible PC MAX2769EVKIT EV Kit Oscilliscope or logic analyzer to measure digital outputs Denotes RoHS-compliant (optional) 19-8782 Rev 0 3/17Evaluates: MAX2769 MAX2769 Evaluation Kit 11) Run the control software on an IBM-compatible PC. Connections and Setup Load the default state by clicking Settings, then This section provides a step-by-step guide to operating defaults, also set the SHDN and IDEL pins to 1, under the EV kit and testing the device functions. Caution: Do Entry page, Hardware Control section. Upon device not turn on the DC power or RF signal generators power-up, the default state should set the MAX2769 until all connections are completed. device in automatic-gain-control mode (AGCMODE 1) Connect the PC to the INTF3000 interface board = 00, PGAIEN = 1, and PGAQEN = 0). The default using the USB cable. On the INTF3000, remove configuration will set the center frequency to 3.9MHz jumper JU1, and connect a DC supply set to +3V to and a bandwidth of 2.5MHz. Using the control the VPULL connector. Connect the 25-pin connector software, configure the following: of the INTF3000 (J4) directly to the 25-pin connector a) In the Entry page of the graphical user interface of the EV kit (JDR1). (GUI), set the reference frequency to 16.368MHz. 2) Connect a DC supply set to +3V (through an ammeter b) Set the R divider to 16. if desired) to jumpers W19 and W20 on the EV kit. Do not turn on the supply. When using the on-board linear c) Enable the I and Q channels by setting the regulators to power the MAX2769, connect pins 1-2 of IQ enable = 1. jumpers W16 and W17. d) Set the output level to 1X = analog outputs 3) Connect a DC supply set to +5V to jumper W12 on the through the Entry page or configuration register 2. EV kit. Connect a DC supply set to -5V to jumper W11 12) Activate the RF generator and observe the IF signal at on the EV kit. Do not turn on the supply. 4.092MHz at an I OUT ANA SMA connector J3. 4) Make sure that jumpers W1W9 and W18 are shorted 13) Set the output level to 00 = CMOS logic through the for proper supply connection. Entry page and observe the ADC digital output at 5) Leave jumpers W13, W14, W15, and W28 open J9AJ9D header pins. and connect jumper W23 to ground (pins 1-2) if the MAX2769 is evaluated using a 3-wire bus. Layout Issues 6) Set the signal generator to 1575.42MHz, -110dBm. A good PCB is an essential part of an RF circuit design. Do not turn on the generators output. Connect the RF The EV kit PCB can serve as a guide for laying out signal generator to the LNA1 input. a board using the devices. Keep traces carrying RF 7) Connect LNA OUT SMA connector (J8) to the MIX IN signals as short as possible to minimize radiation and SMA connector (J12) on the EV kit. insertion loss. Use impedance control on all RF signal 8) Connect the output of the MAX4444 buffer (connector traces. The exposed paddle must be soldered evenly J3) on the EV kit to a spectrum analyzer. to the boards ground plane for proper operation. Use 9) Turn on the DC supply. The supply current should abundant throughputs beneath the exposed paddle and read approximately 20mA. between RF traces to minimize undesired RF coupling. 10) Visit HERE to download the latest version of the EV To minimize coupling between different sections of the kit software, MAX2769A Setup 2-0-1.exe. Run the IC, each V pin must have a bypass capacitor with CC installation file. low impedance to the closest ground at the frequency of interest. Do not share ground vias among multiple connections to the PCB ground plane. Refer to the Layout Issues section of the MAX2769 IC data sheet for more information. Maxim Integrated 2 www.maximintegrated.com