19-3815; Rev 0; 9/05
MAX2741 Evaluation Kit
Evaluates: MAX2741
General Description
The MAX2741 evaluation kit (EV kit) simplifies evalua-
tion 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 sig-
nal inputs and outputs use SMA connectors to facilitate
the connection of RF test equipment.
♦
Easy Evaluation of the MAX2741
♦
+2.7V to +3.0V Single-Supply Operation
♦
All Critical Peripheral Components Included
Features
Ordering Information
PART
MAX2741EVKIT
TEMP RANGE
-40°C to +85°C
IC PACKAGE
28 Thin QFN-EP*
*EP
= Exposed paddle.
Component List
DESIGNATION QTY
C1
C2, C3, C4,
C8, C10, C23,
C27, C33, C47,
C50–C54, C60
C5, C6, C9,
C11, C12, C13,
C48
C7, C14, C24,
C25, C26, C28,
C30, C31
C20, C21, C32,
C57, C58
C22
C34–C38, C49
C39, C40
C41–C44
C45, C46
C59, C62
J1
1
DESCRIPTION
2.2pF ±0.1pF (0402) capacitor
Murata GRM1555C1H2R2B
0.1µF ±10% (0402) capacitors
Murata GRM155R61A104K
DESIGNATION QTY
J2, J10, J11,
J12, J14, J19
J3–J9,
J15–J18, J23,
J24
J3–J9,
J15–J18, JP1
J13
JP1
6
DESCRIPTION
Connectors, SMA edge mount,
round contact
Johnson 142-0701-801
1 x 2-pin headers, 2-pin inline headers,
100-mil centers
Sullins PTC36SAAN
Shunts, shorting jumpers
Sullins STC02SYAN
Not installed
1 x 3-pin header, 3-pin inline header,
100-mil center
Sullins PTC36SAAN
6.2nH ±5% (0402) inductor
Coilcraft CS-6N2XJBW
470nH ±2% (0603) inductors
Murata LQW18ANR47G00
36.5kΩ ±1% (0402) resistor
15
13
7
100pF ±5% (0402) capacitors
Murata GRM1555C1H101J
12
0
1
0
Open
1000pF ±10% (0402) capacitors
Murata GRM15571H102K
2200pF ±10% (0402) capacitor
Taiyo Yuden UMK105BJ222KW
0.01µF ±10% (0402) capacitors
Murata GRM155R71C103K
39pF ±5% (0402) capacitors
Taiyo Yuden UMK105CH390JW
680pF ±10% (0402) capacitors
Taiyo Yuden UMK105BJ681KW
5.6pF ±0.5pF (0402) capacitors
Murata GRM1555C1H5R6D
1.0µF ±10% (0402) capacitors
Murata GRM155R60J105K
Connector, DB25, right-angle male
AMP 747238-4
5
1
6
2
4
2
2
1
L1
L2, L3
R1
R2–R5,
R9–R12,
R16–R19,
R26–R29, R32
R6, R8, R25,
R33–R41
R7, R20–R24
R30
1
2
1
17
0Ω ±5% (0402) resistors
12
0
1
10kΩ ±5% (0402) resistors
Open
30Ω ±5% (0402) resistor
________________________________________________________________
Maxim Integrated Products
1
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.
MAX2741 Evaluation Kit
Evaluates: MAX2741
Component List (continued)
DESIGNATION QTY
T1, T2, T3
TP1, TP2
U1
3
0
1
DESCRIPTION
Balun transformers, surface-mount
TOKO 617DB-1675
Test points, not installed
GPS downconverter
Maxim MAX2741ETI
Hex buffers/drivers with open drain,
14-pin SOP
Texas Instruments SN74LV07ADR
Ultra-low-noise, high PSRR,
low-dropout linear regulator, SC70
Maxim MAX8510EXK29-T
19.2MHz voltage-controlled TCXO
KSS/KYOCERA VC-TCXO-208C5-19P2
•
•
REFCLK is the external reference clock input to the
phase-locked loop
GPSIF is the digital output after the 3-bit analog-to-
digital converter
Measurement Configuration
Important Notice:
The EV kit board provides all neces-
sary components to test the entire tuner as one receiver
(RF input to the 2nd IF analog output) or to indepen-
dently 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 pas-
sive, interstage IF filter by removing R12, C39, C40,
C41, C42, C44.
U2, U3
2
U4
1
Y1
1
Detailed Description
Component Suppliers
SUPPLIER
Alpha
ATC
Coilcraft
Kayama
Murata
PHONE
360-647-2360
949-583-9119
847-639-6400
219-489-1533
770-436-1300
FAX
260-671-4936
949-583-9213
847-639-1469
219-489-2261
770-436-3030
Jumper Description
There are eight jumpers on the MAX2741 EV kit. See
Table 1.
Table 1. Jumper Functions
JUMPER STATE
J3
J4
J5
J6
J7
1-2
N.C.
1-2
N.C.
1-2
N.C.
1-2
N.C.
1-2
N.C.
1-2
N.C.
1-2
N.C.
1-2
JP1
2-3
N.C.
FUNCTION
Connect the VCC6 pin supply to VCC.
Connect the VCC6 pin to an external supply.
Connect the VCC1 pin to VCC.
Connect the VCC1 pin to an external supply.
Connect the VCC2 pin to VCC.
Connect the VCC2 pin to an external supply.
Connect the VCC3 pin to VCC.
Connect the VCC3 pin to an external supply.
Connect the VCC4 pin to VCC.
Connect the VCC4 pin to an external supply.
Connect the VCC5 pin to VCC.
Connect the VCC5 pin to an external supply.
Connect to VCC.
Connect an external supply.
Normal operation.
Shut down the MAX2741.
Control the MAX2741 externally.
Note:
Indicate you are using the MAX2741 when contacting
these manufacturers.
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 sup-
port 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:
•
•
•
•
2
J8
J9
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
_______________________________________________________________________________________
MAX2741 Evaluation Kit
Quick Start
The MAX2741 EV kit is fully assembled and factory test-
ed. Follow the instructions in the
Connections and
Setup
section for proper device evaluation.
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.
Evaluates: MAX2741
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 har-
monics 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
•
•
•
•
Layout Issues
A good PC board layout is an essential part of RF cir-
cuit 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.
Connections and Setup
This section provides a step-by-step guide to operating
the EV kit and testing the device’s functions. This exam-
ple 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.
Windows is a registered trademark of Microsoft Corp.
_______________________________________________________________________________________
3
MAX2741 Evaluation Kit
Evaluates: MAX2741
Figure 1. MAX2741 EV Kit Schematic
4
_______________________________________________________________________________________
MAX2741 Evaluation Kit
Evaluates: MAX2741
1.0"
1.0"
Figure 2. MAX2741 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX2741 EV Kit PC Board Layout—Layer 2
_______________________________________________________________________________________
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