19-3559; Rev 0; 1/05
ATION
AILABL
EVALU E
AV
KIT
Integrated L1-Band GPS Receiver
General Description
The MAX2741 L1-band GPS receiver IC offers a high-
performance, compact solution for mobile handsets,
PDAs, and automotive applications. Total voltage gain
of 80dB and a 4.7dB cascaded noise figure can pro-
vide receiver sensitivity for applications requiring
-185dBW for indoor tracking solutions.
This dual-conversion receiver downconverts the
1575.42MHz GPS signal to a 37.38MHz first IF, and then
a 3.78MHz second IF. An integrated 2- or 3-bit ADC (1-
bit SIGN, 1- or 2-bit MAG selectable) samples the sec-
ond IF and outputs the digitized signals to the baseband
processor.
The integrated synthesizer offers the flexibility in fre-
quency planning to allow a single board design to be
employed for reference frequencies from 2MHz to
26MHz. The integrated reference oscillator allows either
TCXO or crystal operation.
The receiver runs from a 2.7V to 3.0V supply, and draws
only 30mA when active. It is offered in a 28-pin thin QFN
package, and is specified for -40°C to +85°C at 3V.
Features
? Supports All Popular Handset Reference
Frequencies Up to 26MHz
? 4.7dB Cascaded Noise Figure
? 80dB Cascaded Gain
? Tolerates -90dBm In-Band Jammer
? Tolerates +13dBm CDMA Out-of-Band Jammer at
Device Input
? Integrated Synthesizer and VCO
? Integrated 2- or 3-Bit ADC
? 50dB IF AGC Range
? Small 28-Pin Thin QFN Package
? SPI? Control Interface
? Clock Output for Baseband Processor
SPI is a trademark of Motorola, Inc.
PIN
THIN Q
Ordering Information
PART
MAX2741ETI
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN
0m
mx5
.0 m
Applications
Pin Configuration/
Functional Diagram
In-Vehicle Navigation Systems (IVNS)
Telematics (Vehicle and Asset Tracking,
Inventory Management)
Automotive Security
V CC 1
1
28
27
Σ
26
25
24
23
MAX2741
22
21
SDO
Emergency Response Systems
Emergency Road-Side Assistance
Location-Based Services/Internet (PDAs)
N.C.
RFIN
2
3
LNA
33.6MHz
20
19
N.C.
V CC 5
Digital Cameras/Camcorders
1612.8MHz
90
/2
0
/96
Recreational Handhelds/Walkie-Talkies
V CC 2
4
/16128
ADC
18
GPSIF0
Geographical Information Systems (GIS)
Consumer Electronics (Location-Based Games)
V CC 3
5
VCO
3225.6MHz
/192
200kHz
P.D.
/R
MUX
17
GPSIF1
Precision Timing
V CC 4
6
16.8MHz
16
GPSIF2
GND
7
SPI INTERFACE
REF
15
GPSCLK
OSC
8
9
10
11
12
13
14
________________________________________________________________ Maxim Integrated Products
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.
1
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