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MAX2771 Evaluation Kit
Evaluates: MAX2771
General Description
The MAX2771 evaluation kit (EV kit) simplifies evaluation
of the MAX2771, a next-generation Global Navigation
Satellite System (GNSS) receiver covering the L1, L2, L5,
E1, E5, E6, B1, B2, and B3 bands, as well as the GPS,
GLONASS, Galileo, QZSS, IRNSS, and BeiDou navigation
satellite systems on a single chip. It enables testing of
device performance and requires no additional support
circuitry. Standard 50Ω SMA connectors are included on
the EV kit for the inputs and outputs to allow for quick and
easy evaluation on the test bench.
The MAX2771 EV kit contains a microcontroller (MCU)
that translates between the three-wire SPI interface and
USB to allow the user to configure internal registers and
modes with Graphical User Interface (GUI) software
running on a PC. The EV kit is fully assembled and tested
at the factory.
This document provides a component list, a list of
equipment required to evaluate the device, a straightforward
test procedure to verify functionality, a description of the
EV kit circuit, the circuit schematic, and artwork for each
layer of the printed circuit board (PCB).
Quick Start
Required Equipment
This section lists the recommended test equipment to
verify operation of the MAX2771. It is intended as a guide
only and some substitutions are possible.
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One RF signal generator capable of delivering
minimum -120dBm up to 3.0GHz (Keysight N5182B
or equivalent)
An RF spectrum analyzer with a range of 100kHz to
3.0GHz (Keysight N9020A or equivalent)
A power supply capable of up to 1A at +2.7V to +6V
One Digital multi-meter for measuring the supply
current (Keysight 34461A or equivalent) (optional)
50Ω coaxial RF cable with SMA connectors
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
at ±5V
A user-supplied Windows-based PC
Oscilloscope or logic analyzer to measure digital
outputs(optional)
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Features
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Easy Evaluation of the MAX2771 IC
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+2.7V to +3.3V Single-Supply Operation
● 50Ω SMA Connectors on the RF and Baseband Input
and Outputs
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All Critical Peripheral Components Included
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Micro-USB Port for Interfacing with PC
Ordering Information
appears at end of data sheet.
319-100239; Rev 0; 8/18
MAX2771 Evaluation Kit
Evaluates: MAX2771
Procedure
This section provides a step-by-step guide to operating
the EV kit and testing the device functions.
Caution: Do not turn on the DC power or RF signal
generators until all connections are completed.
The MAX2771 EV kit includes two on-board MAX8510
linear regulators for powering up the MAX2771 device to a
regulated supply voltage of +2.85V. When using the linear
regulators, connect pins 1-2 of headers J15 and J16. The
MAX2771 can also be powered directly through an external
power supply connected to pin 2 of these headers. Pin 1 of
these 3-pin headers is marked with a dot on the silkscreen.
High-Band Connections
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Set the RF signal generator to 1575.42MHz,
-110dBm power. Do not turn on the generator’s
output. Connect the RF signal generator to the LNA_
HI_IN input (J4) using a coaxial RF cable with SMA
connectors.
Connect LNA_HI_OUT SMA connector (J5) to the
MIX_HI_IN SMA connector (J6) on the EV kit using a
short coaxial RF cable with SMA connectors.
In the GUI’s Streaming and Registers tab, write
0xBEA41603 to the register at address 0x0 and write
0x00C00002 to the register at address 0x9.
Connect the output of the MAX4444 buffer, I_OUT_
ANA (J10) on the EV kit to a spectrum analyzer
using a coaxial RF cable with SMA connectors.
In the GUI’s Receiver, IF and AGC tab (make sure
Auto Update is ON),
– Select Filter type as bandpass filter.
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Select Filter Order to 5th Order Butterworth
option.
Select filter Bandwidth to 2.5MHz.
Select GAIN set from GAININ.
Select ADC Bypass mode in Output Driver
Configuration.
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Download the MAX2771 EV Kit Software
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Download the MAX2771 EV kit software from the
Maxim Integrated website, run the installation file,
and install it.
Start running the GUI program.
Connect the PC to the on board MAX32625 PICO
microcontroller module on the EV kit using the
provided USB cable. The GUI should indicate EV kit
connected in the status log.
Connect a DC supply set to +3V (through an
ammeter if desired) to headers J13 and ground
J14 on the EV kit. Do not turn on the supply. When
using the on-board linear regulators to power the
MAX2771, connect pins 1-2 of headers J15 and J16.
Connect a DC supply set to +5V to header J28 on
the EV kit. Connect a DC supply set to -5V to header
J29 on the EV kit. Do not turn on the supply. Connect
the ground to J25.
Make sure that headers J17– J24 are shorted for
proper supply connection to the MAX2771.
Turn on the power supplies, the digital multimeter
should read around 20mA of current.
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Powering the EV Kit
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Turn on the RF signal generator output and observe
the output in Signal analyzer at 4.092MHz. See
Figure 1
below.
Set the Driver Configuration to CMOS logic to
observe the ADC digital output at J26 header pins.
ADC Output Bit and Data format can be selected
accordingly from GUI. See
Figure 2.
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Maxim Integrated
│
2
MAX2771 Evaluation Kit
Evaluates: MAX2771
Figure 1. Spectrum of IF Signal within the Filter response (High Band)
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Maxim Integrated
│
3
MAX2771 Evaluation Kit
Evaluates: MAX2771
Figure 2. ADC Outputs on Oscilloscope
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MAX2771 Evaluation Kit
Evaluates: MAX2771
Low-Band Connections
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Select Filter Order to 5th Order Butterworth option.
Select filter Bandwidth to 2.5MHz.
Update Centre Frequency bits with value
1100000.
Select GAIN set from GAININ in AGC mode
Select ADC Bypass mode in Output Driver
Configuration.
Set the RF signal generator to 1176.45MHz,
-110dBm power. Do not turn on the generator’s
output. Connect the RF signal generator to the LNA_
LO_IN input (J1) using a coaxial RF cable with SMA
connectors.
Connect LNA_LO_OUT SMA connector (J2) to the
MIX_LO_IN SMA connector (J3) on the EV kit using
a coaxial RF cable with SMA connectors.
Connect the output of the MAX4444 buffer, I_OUT_
ANA (J10) on the EV kit to a spectrum analyzer
using coaxial RF cable with SMA connectors.
In the GUI’s Streaming and Registers tab, write
0xBEA41603 to the register at address 0x0 and write
0x00C00002 to the register at address 0x9.
In the GUI’s Receiver, PLL and Clock tab (make sure
Auto Update is on),
– Select L2/L5band.
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Select Fractional PLL Mode in PLL Control
Mode.
Set Reference division ratio to 3 and input LO
Frequency to 1173.3333MHz.
Check for the Lock detect button to go green.
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Turn on the RF signal generator output and observe
the output in Signal analyzer at 3.11MHz.
Set the Driver Configuration to CMOS logic to
observe the ADC digital output at J26 header pins.
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Layout Issues
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In the GUI’s Receiver IF and AGC tab,
– Select ‘LNA_LO is Active’ in LNA Mode field.
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Select Mixer Mode as ‘Enable Low Band’
Select Filter type as bandpass filter.
A good PCB is an essential part of an RF circuit design.
The EV kit PCB can serve as a guide for laying out a
board using the MAX2771. Keep traces carrying RF
signals as short as possible to minimize radiation and
insertion loss. Use impedance control on all RF signal
traces. The exposed paddle must be soldered evenly to
the board’s ground plane for proper operation. Use abun-
dant vias beneath the exposed paddle and between RF
traces to minimize undesired RF coupling. To minimize
coupling between different sections of the IC, each VCC
pin must have a bypass capacitor with 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 MAX2771 IC data sheet for more information
Component Suppliers
SUPPLIER
Murata Mfg. Co., Ltd.
Rakon Ltd.
Yageo Corporation
Kemet Electronics Pvt Ltd
WEBSITE
www.murata.com
www.rakon.com
www.yageo.com
www.kemet.com/
Ordering Information
PART
MAX2771EVKIT#
#Denotes
RoHS-compliant
TYPE
EV Kit
Note:
Indicate that you are using the MAX2771 when contact-
ing these component suppliers.
www.maximintegrated.com
Maxim Integrated
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Microcontroller MCU
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