MAX2670EVKIT Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Evaluation Kit

MAX2670 Evaluation Kit
Evaluates: MAX2670
General Description
The MAX2670 evaluation kit (EV kit) is an easy-to-use
platform that enables straightforward evaluation of the
MAX2670 two-stage high-performance GPS LNA, which
is designed for use in demanding automotive applica-
tions and provides 35dB gain. The EV kit includes all
functionality that would typically be found in a typical
remote antenna module, with the exception of a 12V
regulator. Optimal matching and coupling circuits are
included on the EV kit, enabling “plug and play” opera-
tion. In many applications, an interstage SAW filter is used
to maximize immunity to out-of-band interferers. A pair
of common SAW filter footprints are available to enable
evaluation in this configuration. Resistor options are
provided to enable stand-alone testing of either gain
stage or cascade testing of the two gain stages and
optional SAW filter. Interfacing the MAX2670 EV kit to
RF test equipment is streamlined using industry-standard
SMA connectors.
Benefits and Features
●● Flexible Evaluation of the MAX2670 IC
• Stand-Alone AMP 1 or AMP 2 Configuration
• Cascade Configuration with Interstage SAW Filter*
●● Optimal Matching and Coupling Eliminates Tuning
●● All Ports Matched to 50Ω and Accessible through
SMA Connectors for Simple Interfacing
●● Proven PCB Layout
●● Fully Assembled and Tested
*SAW filter not included.
Ordering Information appears at end of data sheet.
Quick Start
Required Equipment
●● MAX2670 EV kit
●● Linear DC power supply capable of sourcing at least
100mA between 3V and 5.25V
●● Network analyzer
●● Noise figure meter
●● Two RF signal generators with maximum RF power
level of at least 0dBm
●● Spectrum analyzer
●● Power meter
Procedure
The EV kit is fully assembled and tested and can be tested
directly out of the box. The following procedures provide
examples of how to measure common specifications of the
MAX2670:
Measure the Stand-Alone Gain of Each Gain Stage
Follow the steps below to measure the stand-alone gain
of each of the two gain stages. Full 2-port S parameters
can be measured using this procedure, but be aware that
the observed angle will not be referenced to the device’s
pins. Detailed discussion of calibrating S parameter
measurements is beyond the scope of this document:
1) Configure the network analyzer with -35dBm RF power
level and 800MHz to 2000MHz frequency span.
2) Perform 2-port calibration of the network analyzer.
3) Disable power-supply output, adjust output level to 5V,
and set current limit to at least 100mA.
4) Connect supply leads to connector JU1 on the EV kit.
5) Connect network analyzer to AMP 1 (Port 1 = J5,
Port 2 = J7).
6) Enable power supply.
7) Measure |S21| of AMP 1.
8) Disable power supply.
9) Connect network analyzer to AMP 2 (Port 1 = J4,
Port 2 = J6).
10) Enable power supply.
11) Measure |S21| of AMP 2. By default, AMP 2 is in high-
gain mode (component R7 open).
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