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MAX2411A_

MAX2411A Evaluation Kit

Maxim Integrated 

MAX2411A Evaluation Kit

Connections and Setup

This section provides a step-by-step guide for operat-

ing the EV kit and testing all four major functions: the

LNA, receive mixer, transmit mixer, and PA driver. Do

not turn on the DC power or RF signal generators

until all connections are made.

Low-Noise Amplifier

1) Set the RXEN jumper on the EV kit to the “Logic 1”

position and the TXEN jumper to the “Logic 0” posi-

tion. This enables the MAX2411A’s receive mode.

2) Connect a DC supply set to 3V (through an amme-

ter if desired) to the VCC and GND terminals on the

EV kit. Do not turn on the supply.

3) Connect one RF signal generator with the output

disabled to the LNAIN SMA connector. Set the gen-

erator for an output frequency of 1.9GHz at a power

level of -40dBm.

4) Connect a spectrum analyzer to the LNAOUT SMA

connector on the EV kit. Set it to a center frequency

of 1.9GHz, a total span of 200MHz, and a reference

level of 0dBm.

5) Turn on the DC supply. The supply current should

read approximately 20mA (if using an ammeter).

6) Enable the RF generator’s output. A signal on the

spectrum analyzer’s display should indicate a typi-

cal gain of 16.2dB after accounting for cable losses.

7) If desired, the shutdown feature can be tested by

moving the RXEN jumper into the “Logic 0” position.

The supply current should drop to less than 10µA.

Receive Downconverter Mixer

1) Disable the output of the RF signal generator. Turn

off the DC supply. Remove the RF signal generator

and spectrum analyzer from the LNAIN and LNAOUT

connectors. The DC supply connections needed for

testing the downconverter mixer are the same as in

the LNA section.

2) Set the RXEN jumper on the EV kit to the “Logic 1”

position and the TXEN jumper to the “Logic 0” posi-

tion. This enables the MAX2411A’s receive mode.

3) Connect one RF signal generator (with the output

disabled) to the LO SMA connector. Set the fre-

quency to 1.5GHz and the output power to -10dBm.

This is the LO signal.

4) Connect the other RF signal generator (with the out-

put disabled) to the RXMXIN SMA connector. Set

the frequency to 1.9GHz and the output power to

-30dBm. This is the RF input signal.

5) Connect the spectrum analyzer to the IF SMA con-

nector. Set the spectrum analyzer to a 400MHz

center frequency, a 200MHz total span, and a

0dBm reference level.

6) Turn on the DC supply, LO signal generator, and RF

input signal generator.

7) The downconverted output signal at 400MHz is visi-

ble on the spectrum analyzer, indicating a mixer

conversion gain of typically 9.4dB after accounting

for cable and balun losses. The balun loss is typi-

cally 1dB at 400MHz.

Power-Amplifier Driver

1) Disable the outputs of the signal generators. Turn

off the DC supply. Remove any RF signal connec-

tions made in the above tests.

2) Set the RXEN jumper to the "Logic 0" position, and

the TXEN jumper to the "Logic 1" position. This puts

the MAX2411A in transmit mode.

3) Set the voltage source to be used for the gain-control

(GC) voltage to 2.15V and turn it off. Connect it to

the middle pin of the VGC jumper on the EV kit.

4) Connect to the PADRIN SMA Connector an RF signal

generator with the output disabled. Set the frequency

to 1.9GHz and the output power to -10dBm.

5) Connect the PADROUT SMA connector to the spec-

trum analyzer. Configure the analyzer to a center

frequency of 1.9GHz, a reference level of +10dBm,

and 200MHz total span.

6) Turn on the DC supply, VGC voltage source, and RF

signal generator.

7) The supply current should read typically 30mA. A

1.9GHz signal should be visible on the spectrum

analyzer display, indicating a typical gain of 15dB

after accounting for cable losses.

8) Lowering the voltage on the VGC voltage source to

0 should reduce the gain typically by 35dB.

Transmit Upconverter Mixer

1) Disable the outputs of the signal generators.

Disconnect the VGC voltage source. Turn off the DC

supply. Remove any RF signal connections made in

the above tests.

2) Set the RXEN jumper to the "Logic 0" position, and

the TXEN jumper to the "Logic 1" position. This puts

the MAX2411A in transmit mode.

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