Maxim MAX2741 Operator's Manual

General Description

The MAX2741 evaluation kit (EV kit) simplifies evalua­tion of the MAX2741 L1-band global positioning system
(GPS), radio-frequency (RF), front-end receiver IC. It
enables testing of the device’s RF performance and
requires no additional support circuitry. The EV kit’s sig­nal inputs and outputs use SMA connectors to facilitate
the connection of RF test equipment.

Features

♦ Easy Evaluation of the MAX2741

♦ +2.7V to +3.0V Single-Supply Operation

♦ All Critical Peripheral Components Included

Evaluates: MAX2741

MAX2741 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-3815; Rev 0; 9/05

Component List

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

PART TEMP RANGE IC PACKAGE

MAX2741EVKIT

-40°C to +85°C

28 Thin QFN-EP*

*EP = Exposed paddle.

D ESIG N A T IO N Q T YD ESC R IPT IO N

C 11

C 2, C 3, C 4,

C 8, C 10, C 23,

C 27, C 33, C 47,

C 50–C 54, C 60

C 5, C 6, C 9,

C 11, C 12, C 13,

C 48

C 7, C 14, C 24,

C 25, C 26, C 28,

C 30, C 31

C 20, C 21, C 32,

C 57, C 58

C 22 1

C 34–C 38, C 49 6

C 39, C 40 2

C 41–C 44 4

C 45, C 46 2

C 59, C 62 2

J1 1

2.2p F ± 0.1p F ( 0402) cap aci tor
M ur ata G RM 1555C 1H 2R2B

0.1µF ± 10% ( 0402) cap aci tor s

15

M ur ata G RM 155R61A104K

100p F ± 5% ( 0402) cap aci tor s

7

M ur ata G RM 1555C 1H 101J

0O p en

1000p F ± 10% ( 0402) cap aci tor s

5

M ur ata G RM 15571H 102K

2200p F ± 10% ( 0402) cap aci tor
Tai yo Y ud en U M K105BJ222KW

0.01µF ± 10% ( 0402) cap aci tor s
M ur ata G RM 155R71C 103K

39p F ± 5% ( 0402) cap aci tor s
Tai yo Y ud en U M K105C H 390JW

680p F ± 10% ( 0402) cap aci tor s
Tai yo Y ud en U M K105BJ681KW

5.6p F ± 0.5p F ( 0402) cap aci tor s
M ur ata G RM 1555C 1H 5R6D

1.0µF ± 10% ( 0402) cap aci tor s
M ur ata G RM 155R60J105K

C onnector , D B25, r i g ht- ang l e m al e
AM P 747238- 4

D ESIG N A T IO N Q T YD ESC R IPT IO N

J2, J10, J11,

J12, J14, J19

J3–J9,

J15–J18, J23,

J24

J3–J9,

J15–J18, JP 1

J13 0 N ot i nstal l ed

JP 11

L1 1

L2, L3 2

R1 1 36.5kΩ ± 1% ( 0402) r esi st or

R2–R5,

R9–R12,

R16–R19,

R26–R29, R32

R6, R8, R25,

R33–R41

R7, R20–R24 0 O p en

R30 1 30Ω ± 5% ( 0402) r esi stor

6

13

12

17 0Ω ± 5% ( 0402) r esi stor s

12 10kΩ ± 5% ( 0402) r esi stor s

C onnector s, S M A ed g e m ount,
r ound contact
Johnson 142- 0701- 801

1 x 2- p i n head er s, 2- p i n i nl i ne head er s,
100- m i l center s
S ul l i ns P TC 36S AAN

S hunts, shor ti ng j um p er s
S ul l i ns S TC 02S Y AN

1 x 3- p i n head er , 3- p i n i nl i ne head er ,
100- m i l center
S ul l i ns P TC 36S AAN

6.2nH ± 5% ( 0402) i nd uctor
C oi l cr aft C S - 6N 2X JBW

470nH ± 2% ( 0603) i nd uctor s
M ur ata LQW 18AN R47G00

Evaluates: MAX2741

Detailed Description

The MAX2741 EV kit simplifies evaluation of the MAX2741
GPS RF receiver front-end IC. It enables testing of the
device’s RF performance and requires no additional sup­port circuitry. The EV kit’s signal inputs and outputs use
SMA connectors to facilitate the connection of RF test
equipment. In this section, detailed descriptions of the EV
kit board as well as the control interface/software are
given to facilitate better evaluation of the IC.

Input/Output Ports

The MAX2741 EV kit has one RF input port, two IF output
ports, one IF input port, one reference clock input port,
and a GPS IF output port:

• RFIN (J2) is the GPS RF signal input port with SMA
connector

• 1st IFOUT is the output of the 1st stage

• 2nd IFOUT is the output of the 2nd stage

• 2nd IFIN is the input to the 2nd stage

• REFCLK is the external reference clock input to the
phase-locked loop

• GPSIF is the digital output after the 3-bit analog-to­digital converter

Measurement Configuration

Important Notice: The EV kit board provides all neces­sary components to test the entire tuner as one receiver
(RF input to the 2nd IF analog output) or to indepen­dently test the 1st stage (RF input to 1st IF output) and
the 2nd stage (the 2nd IF input to the 2nd IF output). All
the required passive components are provided and
installed on the board.

To test the entire tuner as one receiver, the user must
disconnect the connections to the 1st IF output SMA
and the 1st IF input SMA by removing C35, C36, C37,
and C38.

To test the 1st stage and the 2nd stage independently,
the user must disconnect the connections to the pas­sive, interstage IF filter by removing R12, C39, C40,
C41, C42, C44.

Jumper Description

There are eight jumpers on the MAX2741 EV kit. See
Table 1.

MAX2741 Evaluation Kit

2 _______________________________________________________________________________________

SUPPLIER PHONE FAX

Alpha 360-647-2360 260-671-4936

ATC 949-583-9119 949-583-9213

Coilcraft 847-639-6400 847-639-1469

Kayama 219-489-1533 219-489-2261

Murata 770-436-1300 770-436-3030

Component Suppliers

Note: Indicate you are using the MAX2741 when contacting
these manufacturers.

FUNCTION

1-2 C onnect the V C C 6 p i n sup p l y to V C C .

J3

C onnect the V C C 6 p i n to an exter nal sup p l y.

1-2 C onnect the V C C 1 p i n to V C C .

J4

C onnect the V C C 1 p i n to an exter nal sup p l y.

1-2 C onnect the V C C 2 p i n to V C C .

J5

C onnect the V C C 2 p i n to an exter nal sup p l y.

1-2 C onnect the V C C 3 p i n to V C C .

J6

C onnect the V C C 3 p i n to an exter nal sup p l y.

1-2 C onnect the V C C 4 p i n to V C C .

J7

C onnect the V C C 4 p i n to an exter nal sup p l y.

1-2 C onnect the V C C 5 p i n to V C C .

J8

C onnect the V C C 5 p i n to an exter nal sup p l y.

1-2 C onnect to V C C .

J9

C onnect an exter nal sup p l y.

1-2 N or m al op er ati on.

2-3 S hut d ow n the M AX 2741.

JP1

C ontr ol the M AX 2741 exter nal l y.

Table 1. Jumper Functions

Component List (continued)

D ESIG N A T IO N

D ESC R IPT IO N

T1, T2, T3

Bal un tr ansfor m er s, sur face- m ount
TOKO 617D B- 1675

TP 1, TP 2

Test p oi nts, not i nstal l ed

U 1

G P S d ow nconver ter
M axi m M AX 2741E TI

U 2, U 3

H ex b uffer s/d r i ver s w i th op en d r ai n,
14- p i n S OP
Texas Instr um ents S N 74LV 07AD R

U 4

U l tr a- l ow - noi se, hi g h P S RR,
l ow - d r op out l i near r eg ul ator , S C 70
M axi m M AX 8510E X K29- T

Y 1

19.2M H z vol tag e- contr ol l ed TC X O

KS S /KY O C E RA V C - TC X O - 208C 5- 19P 2

Q T Y

3

0

1

2

1

1

JUMPER STATE

N.C.

N.C.

N.C.

N.C.

N.C.

N.C.

N.C.

N.C.

Quick Start

The MAX2741 EV kit is fully assembled and factory test­ed. Follow the instructions in the Connections and
Setup section for proper device evaluation.

Test Equipment Required

This section lists the recommended test equipment to
verify operation of the MAX2741. It is intended as a
guide only, and some substitutions are possible.

• An RF signal generator capable of delivering RF
power as low as -120dBm and as high as 0dBm at
the 1575.42MHz operating frequency such as HP
E4433B, or equivalent

• An RF spectrum analyzer that covers the MAX2741
operating frequency range, as well as a few har­monics such as FSEB20, or equivalent

• One DC supply capable of up to 100mA at 2.6V

to 3.3V

• Power meter capable of measuring up to 0dBm

• One ammeter to measure the supply current
(optional)

•A PC with Windows

®

98/XP

Connections and Setup

This section provides a step-by-step guide to operating
the EV kit and testing the device’s functions. This exam­ple assumes that you intend to test the tuner as one
receiver. (See the Measurement Configuration in the
Detailed Description section.) Ensure that the shunts
are across jumpers J3–J9. Connect pin 1 to pin 2 of
JP1. Do not turn on the DC power or RF signal gen-

erators until all connections are made:

1) Connect a DC supply set to +2.75V to the VDC and
GND terminals on the EV kit. Do not turn on the supply.

2) Connect the RF signal generator to the RFIN SMA
connector; do not turn on the generator’s output.
Set the output of the RF signal generator to

1575.42MHz and power level to -90dBm.

3) Connect the EV kit to a PC through a parallel cable.

4) Download the MAX2741 software from the Maxim
website at www.maxim-ic.com. Install and run the
software on an IBM-compatible PC.

5) Connect the spectrum analyzer to the 2nd IFOUT
SMA connector. Set the center frequency to

3.78MHz and the span to 1MHz.

6) Turn on the DC power supply. The supply current
should read approximately 31mA.

7) Enable the RF generator’s output. Use the software
to set the registers and send to the part. Click on
the Test Mode button, then choose Lowpass Filter
and ADC, click Next, and choose Observe IF Signal
at Output of LPF; then click Finish.

8) The spectrum analyzer should display a tone at

3.78MHz at approximately -8dBm.

Layout Issues

A good PC board layout is an essential part of RF cir­cuit design. The EV kit PC board can serve as a guide
for laying out a board using the MAX2741. Keep traces
carrying RF signals as short as possible to minimize
radiation and insertion loss. Use impedance control on
all RF signal traces. Bypass the VCC node of the PC
board with capacitors to the closest ground.

Evaluates: MAX2741

MAX2741 Evaluation Kit

_______________________________________________________________________________________ 3

Windows is a registered trademark of Microsoft Corp.

Evaluates: MAX2741

MAX2741 Evaluation Kit

4 _______________________________________________________________________________________

Figure 1. MAX2741 EV Kit Schematic

Evaluates: MAX2741

MAX2741 Evaluation Kit

_______________________________________________________________________________________ 5

Figure 2. MAX2741 EV Kit Component Placement Guide—
Component Side

1.0"

Figure 3. MAX2741 EV Kit PC Board Layout—Layer 2

1.0"

Evaluates: MAX2741

MAX2741 Evaluation Kit

6 _______________________________________________________________________________________

Figure 4. MAX2741 EV Kit PC Board Layout—Layer 3

1.0"

Figure 5. MAX2741 EV Kit PC Board Layout—Component Side

1.0"

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7

© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

Evaluates: MAX2741

MAX2741 Evaluation Kit

Figure 6. MAX2741 EV Kit PC Board Layout—Secondary Side

1.0"

Springer

Mouser Electronics

Authorized Distributor

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