1846.PDF

19-1324; Rev 1; 2/98

MAX2411A Evaluation Kit

________________General Description

The MAX2411A evaluation kit (EV kit) simplifies testing

of the MAX2411A. This EV kit allows evaluation of the

MAX2411A’s low-noise amplifier (LNA), receive down-

converter mixer, transmit upconverter mixer, variable-

gain power-amplifier (PA) driver, and power-management

features.

____________________________Features

+2.7V to +5.5V Single-Supply Operation

SMA Inputs and Outputs on RF and IF Ports

Allows Testing of Shutdown Mode

Fully Assembled and Tested

____________________Component List _______________Ordering Information

DESIGNATION

QTY

DESCRIPTION

PART

MAX2411AEVKIT

TEMP. RANGE

PIN-PACKAGE

28 QSOP

C1, C2

47pF ceramic capacitors, 0603 size

-40°C to +85°C

10µF tantalum capacitor

AVX TAJC106K016

C4, C5,

C6, C8

0.1µF ceramic capacitors, 0805 size

______________Component Suppliers

C7, C10, C11,

C16, C17,

C19, C20

SUPPLIER

PHONE

INTERNET

220pF ceramic capacitors, 0805 size

AVX

(803) 946-0690/

(803) 626-3123 FAX

http://www.avxcorp.com

C9, C12–C15,

C18

1000pF ceramic capacitors, 0805 size

Coilcraft

(847) 639-6400/

(847) 639-1469 FAX

http://www.coilcraft.com

C21

1pF ceramic capacitor, 0603 size

Not installed

18nH inductor, 0805 size

Coilcraft 0805CS-180XMBC

Taiyo Yuden

USA

(408) 573-4150/

(408) 573-4159 FAX

http://www.t-yuden.com

C22

_________________________Quick Start

The MAX2411A EV kit is fully assembled and factory

tested. Follow these instructions for initial evaluation of

the MAX2411A.

5.6nH inductor, 0805 size

Taiyo Yuden HK16085N6S

L3, L4, L11,

L12

27nH inductors, 0805 size

Coilcraft 0805CS-270XMBC

Test Equipment Required

This section lists the recommended test equipment to

verify the operation of the MAX2411A. It is intended as

a guide only, and some substitutions may be possible.

4:1 balun

Toko 617DB-1010 Type B4F

L8, L13

3.9nH inductors, 0805 size

Taiyo Yuden HK16083N9S

Two RF signal generators capable of delivering

0dBm of output power at frequencies up to 2GHz

(HP8648C, or equivalent).

R1, R2, R3

resistors, 0805 size

R4, R6

Not installed

R5, R7

resistors

An RF spectrum analyzer that covers the operating

frequency range of the MAX2411A as well as a few

harmonics (HP8561E, for example).

RXMXIN

SMA connector (PC mount)

LNAIN,

LNAOUT, IF,

LO, PADRIN,

PADROUT,

TXMXOUT

A power supply that can provide up to 100mA at

+2.7V to +5.5V.

SMA connectors (edge mount)

A voltage source (0 to 5V) for adjusting the gain-con-

trol (GC) voltage on the PA driver.

RXEN, TXEN,

VGC

3-pin headers

An optional ammeter for measuring the supply

current.

VCC, GND

2-pin headers

Several 50

SMA cables.

MAX2411AEEI, 28-pin QSOP

________________________________________________________________ Maxim Integrated Products 1

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

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.

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.

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 V CC 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.

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 V GC 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, V GC 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 V GC voltage source to

0 should reduce the gain typically by 35dB.

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.

Transmit Upconverter Mixer

1) Disable the outputs of the signal generators.

Disconnect the V GC 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.

2 _______________________________________________________________________________________

MAX2411A Evaluation Kit

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 IF SMA connector. Set the gen-

erator to a frequency of 400MHz and a power level

of -32dBm. This is the IF input signal.

5) Connect the TXMXOUT SMA connector to the spec-

trum analyzer. Configure the analyzer for a center

frequency of 1.9GHz, a reference level of 0dBm,

and 200MHz total span.

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

input signal generator.

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

spectrum analyzer should show a 1.9GHz signal,

indicating a conversion gain of typically 8.5dB after

accounting for cable and balun losses. The balun

loss is typically 1dB at 400MHz.

8) To observe the remainder of the TX mixer output

spectrum, increase the span on the spectrum ana-

lyzer from 200MHz to 2GHz.

_______________Detailed Description

The MAX2411A EV kit circuitry is described in this section.

For more detailed information about the operation of

the device itself, please consult the MAX2411A data sheet.

Bidirectional IF Port

The MAX2411A has a unique differential, bidirectional

IF port, allowing the sharing of TX and RX IF filters. To

evaluate the part with the EV kit, a balun is used to con-

vert the single-ended IF input or output at the SMA con-

nector to a differential signal across the IF and IF pins.

In a typical application, a differential filter would be

used, and the filter would connect to a compatible IF

part, such as the MAX2511 or MAX2510.

At the IF and IF pins, inductors L3, L4, L11, and L12

provide a matching network for TX and RX mode, as

well as providing DC bias in RX mode. Capacitors C12

and C13 provide DC blocking to the balun. An extra

component footprint, R4, is provided to resistively ter-

minate this IF port. R4 can also be used for other

experimentation. The balun, L5, provides 4:1 imped-

ance transformation and differential to single-ended

conversion. The other side of the balun is connected to

the IF SMA connector. Component footprints R5, R6,

and R7 are provided for experimentation.

Receiver

This section describes the LNA and receive mixer sec-

tions of the MAX2411A EV kit.

Low-Noise Amplifier (LNA)

The LNA circuitry consists of two DC blocking capaci-

tors, one at the input (C7) and one at the output (C17).

A shunt capacitor, C21, is used as a simple input

matching network.

RX Mixer Input

The receive mixer's input, RXMXIN, requires a simple

matching network. C16 provides DC blocking, and L8

is used to match the input pin to 50

Transmitter

This section describes the PA driver and transmit mixer

sections of the MAX2411A EV kit.

for 1.9GHz operation; capacitor C11 is necessary

for DC blocking. The gain of the PA driver is adjustable

by applying a voltage on the middle pin of the V GC

jumper, which is connected through a 1k

resistor (R3)

to the GC pin on the MAX2411A. Alternatively, by

inserting a shunt, it is possible to set this voltage to

ground or V CC . The position labeled "Logic 0" is con-

nected to ground, and the "Logic 1" position is connected

to V CC .

TX Mixer Output

The transmit mixer output appears on the TXMXOUT

pin, which requires a pull-up inductor to V CC (L2) and a

matching network to a 50

Local Oscillator (LO)

The EV kit’s LO input has a DC blocking capacitor

(C20). No other circuitry is required. For more informa-

tion on the LO port, including the optional use of a dif-

ferential LO source, consult the MAX2411A data sheet.

_______________________________________________________________________________________ 3

. Component foot-

print C22 is available for additional matching network

prototyping. The output of the receive mixer appears at

the bidirectional IF port in receive mode.

PA Driver Amplifier

The PA driver amplifier input is internally matched to

load impedance consisting

of inductors L2 and L13. C19 provides DC blocking.

MAX2411A Evaluation Kit

GND

220pF

LNAOUT

SMA

LNAIN

SMA

LNAOUT

LNAIN

C21

1pF

C17

220pF

GND

V CC

GND

V CC

3 .9 n H

47pF

RXMXIN

SMA

RXMXIN

V CC

C22

OPEN

C16

220pF

V CC

GND

47pF

MAX2411A

C20

220pF

C14

1000pF

SMA

27nH

C13

1000pF

L11

2 7 n H

SMA

GND

OPEN

L12

27nH

OPEN

TOKO

617 DB-1010

TYPE B4F

V CC

C12

1000pF

GND

27nH

18nH

GND

V CC

GND

C15

1000pF

PADROUT

SMA

PADROUT

GND

V CC

C10

220pF

C18

1000pF

5.6nH

TXMXOUT

SMA

V CC

RXEN

TXEN

PADRIN

L13

3.9nH

C19

220pF

LOGIC 1

JU3

JU2

JU1

PADRIN

SMA

V CC

LOGIC 0

0.1

C11

220pF

V GC

TXEN

RXEN

V CC

0.1 m F

0.1

GND

0.1

Figure 1. MAX2411A EV Kit Schematic

4 _______________________________________________________________________________________

MAX2411A Evaluation Kit

________________Power Management

The RXEN and TXEN jumpers on the EV kit control the

operating modes of the MAX2411A. Refer to the

MAX2411A data sheet for operating modes. Series

resistors R1 and R2, included on the RXEN and TXEN

inputs, provide isolation between logic and RF circuitry.

______________________________Layout

A good PC board layout is an essential part of an RF

circuit design. The EV kit PC board can serve as a

guide for laying out a board using the MAX2411A.

Each V CC node on the PC board should have its own

bypass capacitor. This minimizes supply coupling from

one section of the MAX2411A to another. A star topolo-

gy for the supply layout, in which each V CC node on the

MAX2411A circuit has a separate connection to a cen-

tral V CC node, can further minimize coupling between

sections of the MAX2411A.

1.0"

Figure 2. MAX2411A EV Kit Component Placement Guide

Figure 3. MAX2411A EV Kit PC Board Layout—

Component Side

_______________________________________________________________________________________ 5

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