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19-3815; Rev 0; 9/05
MAX2741 Evaluation Kit Evaluates: MAX2741
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. 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 -40C to +85C 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 0.1F 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 36.5k 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 0.01F 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 1.0F 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
0 5% (0402) resistors
12 0 1
10k 5% (0402) resistors Open 30 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-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.
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 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 * * *
2
J8 J9
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
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MAX2741 Evaluation Kit
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. 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 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(R) 98/XP
* * * *
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.
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 generators 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.
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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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MAX2741 Evaluation Kit Evaluates: MAX2741
1.0"
1.0"
Figure 4. MAX2741 EV Kit PC Board Layout--Layer 3
Figure 5. MAX2741 EV Kit PC Board Layout--Component Side
6
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MAX2741 Evaluation Kit Evaluates: MAX2741
1.0"
Figure 6. MAX2741 EV Kit PC Board Layout--Secondary Side
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 (c) 2005 Maxim Integrated Products
Springer
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.

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