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MAX2741 Datasheet

  • MAX2741

  • Integrated L1-Band GPS Receiver

  • 238.67KB

  • 12页

  • MAXIM

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19-3559; Rev 0; 1/05
IT
TION K
VALUA
E
BLE
AVAILA
Integrated L1-Band GPS Receiver
General Description
Features
鈾?/div>
Supports All Popular Handset Reference
Frequencies Up to 26MHz
鈾?/div>
4.7dB Cascaded Noise Figure
鈾?/div>
80dB Cascaded Gain
鈾?/div>
Tolerates -90dBm In-Band Jammer
鈾?/div>
Tolerates +13dBm CDMA Out-of-Band Jammer at
Device Input
鈾?/div>
Integrated Synthesizer and VCO
鈾?/div>
Integrated 2- or 3-Bit ADC
鈾?/div>
50dB IF AGC Range
鈾?/div>
Small 28-Pin Thin QFN Package
鈾?/div>
SPI鈩?Control Interface
鈾?/div>
Clock Output for Baseband Processor
SPI is a trademark of Motorola, Inc.
MAX2741
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掳C to +85掳C at 3V.
28-
THIN
Q
PIN
FN
Ordering Information
PART
MAX2741ETI
TEMP RANGE
-40掳C to +85掳C
PIN-PACKAGE
28 Thin QFN
IFOUT+
IFOUT-
IFIN+
V
CC
6
IFIN-
N.C.
Telematics (Vehicle and Asset Tracking,
Inventory Management)
Automotive Security
Emergency Response Systems
Emergency Road-Side Assistance
Location-Based Services/Internet (PDAs)
Digital Cameras/Camcorders
Recreational Handhelds/Walkie-Talkies
Geographical Information Systems (GIS)
Consumer Electronics (Location-Based Games)
Precision Timing
V
CC
4
V
CC
2
N.C.
V
CC
1
28
27
26
25
24
23
22
1
危
33.6MHz
MAX2741
N.C.
In-Vehicle Navigation Systems (IVNS)
FILT
SCLK
CS
SDI
SHDN
XTAL
________________________________________________________________
Maxim Integrated Products
REFCLK
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
5.
0m
m
x
5.0
m
m
Applications
Pin Configuration/
Functional Diagram
21
SDO
2
LNA
1612.8MHz
4
90
/2
0
/96
/16128
P.D.
200kHz
VCO
3225.6MHz
20
N.C.
RFIN
3
19
V
CC
5
ADC
18
GPSIF0
V
CC
3
5
/R
/192
16.8MHz
MUX
17
GPSIF1
6
16
GPSIF2
GND
7
SPI INTERFACE
REF
OSC
11
12
13
14
15
GPSCLK
8
9
10
1

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