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19-3325; Rev 0; 7/04
MAX2745 Evaluation Kit
General Description
The MAX2745 evaluation kit (EV kit) simplifies evaluation of the MAX2745 global positioning system (GPS), radio frequency (RF), 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. Easy Evaluation of the MAX2745 +2.4V to +3.6V Single-Supply Operation Jumpers for Digital Control and Shutdown All Critical Peripheral Components Included
Features
Evaluates: MAX2745
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 360-671-4936 949-583-9213 847-639-1469 219-489-2261 770-436-3030 PART MAX2745EVKIT
Ordering Information
TEMP RANGE -40C to +85C IC PACKAGE 48 TQFP-EP*
*EP = Exposed paddle. **These components are for internal test purposes. ***These are the optional components. See the instructions on the schematic for more details.
Note: Indicate you are using the MAX2745 when contacting these manufacturers.
DESIGNATION C1, C3, C6, C7, C9-C15, C17, C22, C33, C53, C54, C109-C114 C2, C23, C32 C4, C8 C5 C16, C59, C60 C18, C19 C27-C30, C48-C51 C36, C43, C47, C52 C66 C80 C81, C100 QTY DESCRIPTION DESIGNATION C98 22 100nF 10% (0402) capacitors Murata GRM155R61A104K C101 C102 C105, C106 C107 F5 QTY 1 1 1 2 1 1
Component List
DESCRIPTION 1.0F 20% (0603) capacitor Taiyo Yuden JMK107BJ105MA-B 10pF 0.5pF (0402) capacitor Murata GRM1555C1H100B 1pF 0.1pF (0402) capacitor Murata GRM1555C1H1R0B 1.0F 10% (2012) capacitors AVX TAJR105K016 10nF 10% (0402) capacitor Murata GRM155R71C103K 1.575GHz GPS RF saw filter Murata SAFSE1G57AB0T00R00 Connector DSUB 25-R DB25 M PC board connector AMP 747238-4 Open, SMA edge-mount connectors SMA edge-mount connectors Johnson 142-0701-801 Shunts Digi-Key S9000-ND 2-pin headers, 0.1in center Sullins PTC36SAAN 3-pin headers, 0.1in center Sullins PTC36SAAN
3 2 1 3 2 0** 4 1 0*** 2
100pF 5% (0402) capacitors Murata GRM1555C1H101J 220pF 10% (0402) capacitors Murata GRM155R71H221K 1000pF 10% (0402) capacitor Murata GRM155R71H102K 1500pF 10% (0402) capacitors Murata GRM155R71H152K 39pF 5% (0402) capacitors Murata GRM1555C1H390J Open (0402) capacitors 22pF 5% (0402) capacitors Murata GRM1555C1H220J 12pF 5% (0402) capacitor Murata GRM1555C1H120J Open 10% (0402) capacitor Murata 6800pF 10% (0402) capacitors Murata GRM155R71E682K
J5 J19-J22, J35-J38 J24, J26, J28, J33, J34 JP1-JP12 JP1-JP6, JP12 JP7-JP11
1
0** 5 12 7 5
________________________________________________________________ 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.
MAX2745 Evaluation Kit Evaluates: MAX2745
Component List (continued)
DESIGNATION L58 L60 R1 R5, R8 R6, R18, R19, R20, R27, R69, R70, R77 R9 R10-R13 R14-R17 R22-R25 R59 R62 R71 R79-R86 QTY 1 0*** 1 2 8 1 4 4 0** 0*** 1 1 8 DESCRIPTION 8.2nH 0.1nH (0402) inductor Murata LQP15MN8N2B02 Open 0.1nH (0402) inductor Murata 70k 1% (0402), 1/16W resistor 820 1% (0402), 1/16W resistors 0 1% (0402), 1/16W resistors 100k 1% (0402), 1/16W resistor 200 1% (0402), 1/16W resistors 10k 1% (0402), 1/16W resistors Open, 1%, 1/16W resistors Open, 1% (0402), 1/16W resistor 22.1k 1% (0402), 1/16W resistor 220 5% (0402), 1/10W resistor 30k 1% (0402), 1/16W resistors Y1 1 U12 1 DESIGNATION S2, S3 TP1-TP5 U1 U3 QTY 2 5 0*** 1 DESCRIPTION DIP switches SW4 SMT CTS 204-12ST Test points, PC mini, 0.040 red Digi-key 5000K-ND Open TXCO, 16.367667MHz, SM Rakon MAX2745ECM IC, GPS RF, SM Maxim MAX2745ECM MAX8510EXK27 low-noise linear regulator Maxim MAX8510EXK27 Hex buffer/driver with open drain Texas Instruments SN74LV07ADR 16.368327MHZ XTL Rakon IDD30UM-1SJ 16.367MHz/XZB548
U4
1
**These components are for internal test purposes. ***These are the optional components. See the instructions on the schematic for more details.
Detailed Description
The MAX2745 EV kit simplifies evaluation of the MAX2745 GPS RF 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 board as well as the control interface/software are given to facilitate better evaluation of the IC.
* VDD5V (JP12) is the power supply for the I2C* control interface. It is not required if the control interface is not used.
I/O Ports
The MAX2745 EV kit has one RF input port, three IF output ports, one clock output port, and one PC control port. * RF_IN (J24) is the GPS RF signal input port with SMA connector. * VCMOUT_1P/VCMOUT_1N/DOUT are the IF output ports. * CKOUT is the 16MHz/32MHz clock output port. * J5 is the 25-pin PC parallel control port.
DC Power Supply
The MAX2745 EV kit requires three different power supplies: * VINDC (JP3) is the main power supply for the MAX2745 IC and the external RF circuitry such as the TCXO. This VINDC supply powers the MAX8510 LDO, which produces 2.85V output with extremely low noise. If different supply voltages are desired to test the IC, bypass the LDO and directly power the board through JP2. See the Jumper Description section for more details. * VDD18 (JP1) is the 1.6V to 2.3V supply voltage needed to test the voltage booster section. Do not use VDD18 for normal operation. See the Jumper Description section for more details.
2
Digital Controls
There are two DIP switches (S2, S3) on the MAX2745 EV kit that provide eight digital controls. Refer to the MAX2745 data sheet for more details.
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associate Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips.
_______________________________________________________________________________________
MAX2745 Evaluation Kit
Jumper Description
There are eight jumpers on the MAX2745 EV kit besides the power-supply jumpers. 1) JP9--SHDN. Connect pin 2 to pin 3 (GND) for normal operation. 2) JP7--TCXO power supply. By default the MAX2745 EV kit uses a 16MHz crystal, so leave this jumper open. 3) JP5--External LNA supply. Refer to the MAX2745 data sheet for more details. 4) JP6--Short this jumper when testing the voltage booster. When JP6 is shorted, JP2 MUST be open and 1.6V to 2.3V supply is expected at JP1 (VDD18). 5) JP10--Reserved. Pin 2 MUST be shorted to pin 1 (GND) for normal operation. 6) JP8--Voltage booster enable. Short pin 2 to pin 3 (VDD) to disable the voltage booster (normal operation). 7) JP11--SHDN of the MAX8510 LDO. Connect pin 2 to pin 1 (VDD) to enable the MAX8510 (normal operation). 8) JP2--Short this jumper to connect the MAX8510 LDO output to the power supply of the EV board. If a supply voltage other than 2.85V is desired, leave JP2 open and connect the new supply voltage to pin 1 of JP2. When the voltage booster is enabled, JP2 MUST be open and NO supply is allowed on either pin. * Two power supplies capable of up to 1A at +1.6V to +6.0V * One ammeter for measuring the supply current (optional) * 50 SMA cables * A network analyzer (HP 8753D, for example) to measure small-signal return loss and gain (optional) * An oscilloscope to check the digital IF output
Evaluates: MAX2745
Connections and Setup
This section provides a step-by-step guide to operating the EV kit and testing the device's function. Do not turn on the DC power or RF signal generators until all connections are made: 1) Connect a DC supply set to +3.3V to the VDC and GND terminals on the EV kit. Do not turn on the supply. 2) Connect a DC supply set to +5.0V to the 5VDC on the EV kit. Do not turn on the supply. 3) Connect one RF signal generator to the RFIN SMA connector; do not turn on the generator's output. Set the output frequency to 1575.420000MHz. Set the power level to -120dBm. 4) Connect the ACOMOUT+/- output on the EV kit to a spectrum analyzer through an SMA cable. 5) Connect the EV kit to a PC through a parallel cable. 6) Run the control software on an IBM-compatible PC. 7) Set the digital controls to the appropriate states (refer to the MAX2745 data sheet for the digital control settings). 8) Turn on the DC supplies. The supply current should read approximately 20mA. 9) Activate the RF generator's output. 10) Check the IF outputs. 11) Check other features of the MAX2745, e.g., 16MHz clock output, voltage booster, temperature-sensor output, etc.
Control Software
The control software is needed to test the VSPORT of the MAX2745. It is mainly for internal test purposes and not required for normal operation. Refer to the MAX2745 data sheet for more details.
Quick Start
The MAX2745 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 MAX2745. 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 (HP E4433B, or equivalent) * An RF spectrum analyzer that covers the MAX2745 operating frequency range, as well as a few harmonics (FSEB20, for example)
Layout Issues
A good PC board 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 MAX2745. Keep traces carrying RF signals as short as possible to minimize radiation and insertion loss. Use impedance control on all RF signal traces. The VCC node on the PC board should have decoupling capacitors to the closest ground. Refer to the Layout section of the MAX2745 data sheet for more information.
_______________________________________________________________________________________
3
Evaluates: MAX2745
5 4 3 2
5 4 3 2
5 4 3 2
1
JP7 5 4 3 2 1 TP2 TEMPOUT R62 22.1K HEADER1 C80 4700P 39P 1 39P XTAL1 C33 GND 49 R1 70K R10 R11 R12 30K R83 30K R84 30K R85 C12 100N R70 0 30K R86 VDD R13 200 200 200 GMCTRL_BPF ODS CFS COE XTAL1 XTAL2 VDD_XOSC PD_CHIP VSS_CP VDD_CP CP_OUT VSS_VCO VCO_CTRL VDD_VCO TEMPOUT SDATA 200 1 2 3 4 C32 100P C22 100N R9 C23 100K 100P 100N U3 48 47 46 45 44 43 42 41 40 39 38 37 S2 VDD 8 7 6 5 DIP SW4 C114 100N TEMPOUT Y1 16.368MHZ C13 100N 1 C14 100N VDD C15 100N HEADER1 HEADER1 TP3 TP4 2.7nH C1 100N C5 CLK XTAL1 Open 1000pF R59 C19 C2 100P C18 L60 VDD VDD
3 2 1
MAX2745 Evaluation Kit
5 4 3 2
12P 10P C102 VDD VDD C59 5 4 3 2 1500pF 13 14 15 16 17 18 19 20 21 22 23 24 C60 1500pF C9 100N C98 TEST_EN CKOUT DOUT1 1.0uF 1 2 JP6 HEADER2 30K R79 VDD VS7006 Rev A VDD 22P 22P C7 100N R27 0 C52 1 C10 100N C112 100N J34 SMA C113 100N 1pF 1.575GHz SAFSE1G57AB0T00R00
gnd gnd
2 4
30K R80
VDD_AGC PSAVE XTAL_LFS XTAL_SEL BST_CTRL_AH TEST_EN VDD1V8_1 CKOUT DOUT1 VT_CSW VB_CSW VOUT
30K R81
30K R82
TI_IP
0 VDD 3 JP10 2 1 5 4 3 2 5 4 3 2 HEADER 3 C43 VDD 3 JP8 2 1 HEADER 3 VDD18 22P 22P C36 C110 100N 1 J28 SMA J26 SMA 6800pF
5 4 3 2
R77
Open J35 SMA C100
1
C48
VDD
5 4 3 2
10K R14
10K R15
10K R16
Open J36 SMA
TI_IN
PSAVE XTAL_LFS XTAL_SEL BST_CTRL_AH
1
C49
CKOUT
C111 100N 1
DOUT1
SDATAW R18 R19 R20 0 0 0 SDATA SCLKW SCLK TESTENW TESTEN
1 A1 2 1Y 3 2A 4 2Y 5 3A 6 3Y
VCC 14 6A 13 6Y 12 5A 11 5Y 10 4A 9 7 GND 74LV07A 4Y 8
10K
100N
U12
R17
5 4 3 2
5 4 3 2
5 4 3 2
Figure 1. MAX2745 EV Kit Schematic
C27 1 Open SMA J19
4
TO_QN
Open C28 1 Open SMA J20 VINDC VDDLDO OUT 5 BP 4 10nF C107 C105 1.0uF
TO_QP
C106 1.0uF 2 GND 3 SHDN/ MAX8510EXK2T
Open
U4 1 IN
TO USE CRYSTAL, DNP U1, POPULATE Y1
C29 1
Open SMA J21
TO USE TCXO, DNP Y1, POPULATE U1
HEADER1 TP1 VCO_CTRL C81 6800pF JP9 HEADER 3 R8 820 1 R6 0 C30 R5 820 Open SMA J22 1 2 1500pF C8 220P C4 220P JP4 3 2 1 VDD Open C16 HEADER 3 HEADER 2 Open
TO_IN
1 2 3 1 2
JP11
VINDC
JP3 VDD18
JP1 1 2 HEADER 2
TO USE 16.368 MHz CRYSTAL, DNP L60, C80 POPULATE L60, C80
TO USE 32.736 MHz CRYSTAL,
VDDLDO 2 1 JP2
HEADER 3
TO_IP
HEADER 2
VDD
HEADER 2
VDD5V 1 2
JP12
VDD
HEADER 2
U1 1 NC
VDD 4
2 GND OUT 3 16.367667MHz TCXO
J24 SMA F5 out 3 8.2nH C6 100N 1 JP5 2 HEADER 2 TP5 1 R71 220 HEADER1 J33 SMA 1 C101 L58
1
C66
VRF IN IEXT_LNA VCMOUT_1N
C47
1 in VCMOUT_1P VCMOUT_1N VDD C11 R69 0 VDD 100N
C3 100N C17 100N VDD
1 2 3 4 5 6 7 8 9 10 11 12 XRES CAP_BIAS VDD_BIAS VDD_LNAM VSS VSS RF_IN VSS VDD_FUSE IEXT_LNA VDD_LPF AGC_FIL GMCTRL_BPF ODS CFS COE VDD_DIV SCLK_SCL GBVSS_ADC_DIV VCMOUT_1P VCMPOUT_1N VDD_ADC DVSS_ADC DVDD_ADC
36 35 34 33 32 31 30 29 28 27 26 25
GMCTRL_BPF ODS CFS COE
VCMOUT_1P
VDD5V C53
VDD5V C54 100N
R22 Open Open
R23 Open Open
SDATAR SCLKR
VDD S3 8 7 6 5 1 2 3 4 C109 100N DIP SW4
Open J38 SMA
TI_QN
1
C50
R24 Open Open
Open J37 SMA
TI_QP
1
C51
J5
27 25 24 23 SDATAW 22 21 20 19 18 17 16 15 SCLKW TESTENW SCLKR 14 CONN DSUB 25-R 26 13 13 27 12 12 25 11 11 24 10 10 23 9 9 22 8 8 21 7 7 20 6 6 19 5 5 18 4 4 17 3 3 16 2 2 15 1 1 14 26
_______________________________________________________________________________________
R25 Open Open
MAX2745 Evaluation Kit Evaluates: MAX2745
1.0"
1.0"
Figure 2. MAX2745 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX2745 EV Kit PC Board Layout--Layer 2
1.0"
1.0"
Figure 4. MAX2745 EV Kit PC Board Layout--Layer 3
Figure 5. MAX2745 EV Kit PC Board Layout--Component Side 5
_______________________________________________________________________________________
MAX2745 Evaluation Kit Evaluates: MAX2745
1.0"
Figure 6. MAX2745 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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