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MAX2741ETI+

P1-P3P4-P6P7-P9P10-P12
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.
Applications
In-Vehicle Navigation Systems (IVNS)
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
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
MAX2741
Integrated L1-Band GPS Receiver
________________________________________________________________ Maxim Integrated Products 1
28 27 26 25 24 23 22
V
CC
6
IFOUT+
IFOUT-
IFIN+
IFIN-
N.C.
N.C.
891011 12 13 14
FILT
SCLK
CS
SDI
SHDN
XTAL
REFCLK
15
16
17
18
19
20
21
GPSCLK
GPSIF2
GPSIF1
GPSIF0
V
CC
5
N.C.
SDO
7
6
5
4
3
2
1
GND
V
CC
4
V
CC
3
VCO
3225.6MHz
V
CC
2
RFIN
N.C.
V
CC
1
Σ
LNA
1612.8MHz
33.6MHz
16.8MHz
200kHz
90 0
/96
/192
/2
/16128
P.D.
/R
REF
OSC
ADC
SPI INTERFACE
MAX2741
MUX
Pin Configuration/
Functional Diagram
Ordering Information
19-3559; Rev 0; 1/05
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.
SPI is a trademark of Motorola, Inc.
PART TEMP RANGE PIN-PACKAGE
MAX2741ETI -40°C to +85°C 28 Thin QFN
5
.
0
m
m
x
5
.
0
m
m
2
8
-
P
I
N
T
H
I
N
Q
F
N
EVALUATION KIT
AVAILABLE
MAX2741
Integrated L1-Band GPS Receiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(Operating conditions (unless otherwise specified): V
CC
= 2.7V to 3.0V; REFCLK driven with 10MHz sinusoid, 1.2V
P-P
; registers set
according to mode; no RF input signal; digital baseband outputs left open; T
A
= -40°C to +85°C. Typical values are measured at V
CC
=
2.75V, T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
CC
Pins to GND ...................................................-0.3V to +3.3V
V
CC
Pins to Each Other.........................................-0.3V to +0.3V
FILT to GND................................................-0.3V to (V
CC
+ 0.3V)
CMOS Inputs to GND (SHDN, SCLK,
CS, SDI).................................................+0.3V to (V
CC
+ 0.3V)
CMOS Outputs to GND (CLKOUT,
GPSIF_, SDO).........................................-0.3V to (V
CC
+ 0.3V)
RFIN to GND...............................................-0.3V to (V
CC
+ 0.3V)
First IF Filter I/O to GND (IFOUT±, IFIN±).....-0.3V to (V
CC
+ 0.3V)
Crystal Inputs to GND (XTAL, REFCLK).....-0.3V to (V
CC
+ 0.3V)
Maximum RF Input Power...................................................0dBm
Continuous Power Dissipation (T
A
= +85°C)
28-Pin Thin QFN (derate 20.8mW/°C above +70°C) .1000mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS
MIN
TYP
MAX
Supply Voltage 2.7 3.0 V
Normal operation (T
A
= +25°C) 30 42
Supply Current
Standby (V
SHDN
= V
IL
, SYNTH:D8 = 0) 0.7
mA
Input-Logic High Threshold
V
CC
-
0.1
V
Input-Logic Low Threshold 0.1 V
Input-Logic High/Low Current -10
+10
µA
Output-Logic High I
LOAD
= 100µA
V
CC
-
0.3
V
Output-Logic Low I
LOAD
= 100µA 0.3 V
AC ELECTRICAL CHARACTERISTICS
(Operating conditions (unless otherwise specified): V
CC
= 2.7V to 3.0V for T
A
= -40°C to +85°C; REFCLK driven at 10MHz sinusoid,
1.2V
P-P
; registers set according to mode; using the Typical Application Circuit; CW RF signal at 1575.42MHz. Typical values are mea-
sured at V
CC
= 2.75V, T
A
= +25°C.)
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
1st CONVERSION STAGE (RF TO 1st IF)
RF Frequency L1-band
1575.42
MHz
RF Conversion Gain (Note 1) 15 21 32 dB
Noise Figure Mid-gain (CONFIG1:D4–D0 = 10000) 4.7 dB
Input IP3 (Note 2) -30
dBm
RF Image Rejection (Notes 3, 4) 20 35 dB
LO Leakage at RF LO to RFIN pin -90
dBm
CAUTION! ESD SENSITIVE DEVICE
MAX2741
Integrated L1-Band GPS Receiver
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS (continued)
(Operating conditions (unless otherwise specified): V
CC
= 2.7V to 3.0V for T
A
= -40°C to +85°C; REFCLK driven at 10MHz sinusoid,
1.2V
P-P
; registers set according to mode; using the Typical Application Circuit; CW RF signal at 1575.42MHz. Typical values are mea-
sured at V
CC
= 2.75V, T
A
= +25°C.)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
2nd CONVERSION STAGE (1st IF TO ADC INPUT)
1st IF Frequency At IFOUT
37.38
MHz
Max gain (CONFIG1:D4–D0 = 11111) (Note 1) 48 61 74 dB
Conversion Gain
Min gain (CONFIG1:D4–D0 = 00000) (Note 1) 10 dB
Input IP3 1st conversion (Note 5) -36
dBm
Noise Figure Max gain (CONFIG1:D4–D0 = 11111) 12 dB
Real
0.40
mS
IF Output Port Admittance
Imaginary 1.5 pF
Real
0.40
mS
IF Input Port Admittance
Imaginary
0.15
pF
(SYNTH:D13–D10 = 1111) 2.9
LPF -3dB Corner Frequency
(SYNTH:D13–D10 = 0000) 7.7
MHz
SYNTHESIZER
I
CP_OH
PLL charge-pump source current 75 µA
I
CP_OL
PLL charge-pump sink current
-100
µA
Closed-Loop Phase Noise At 1kHz offset -55
dBc/Hz
Comparison Spurs At ±200kHz offset -44
dBc/Hz
Reference Oscillator Frequency Sinusoid (Note 1) 2 10 26 MHz
REF Input Voltage Level Sinusoid (Note 1) 0.6 2.2 V
P-P
VCO Coarse Tune Range
Programmable (CONFIG1:D7 to D5 = 000 to 111)
(Note 1)
240
MHz
DIGITAL I/O
SPI Clock Frequency 1 MHz
Note 1: Production tested for +25°C and +85°C, guaranteed by design and characterization for -40°C.
Note 2: Test tones at 1575.8MHz and 1576.8MHz at -60dBm/tone.
Note 3: Guaranteed by design and characterization.
Note 4: Image frequency is 1575.42MHz + 2(f
IF
) = 1650.18MHz
Note 5: Test tones at 37.38MHz and 36.88MHz at -50dBm/tone.
P1-P3P4-P6P7-P9P10-P12

MAX2741ETI+

Mfr. #:
Buy MAX2741ETI+
Manufacturer:
Maxim Integrated
Description:
RF RECEIVER 1575.42MHZ 28TQFN
Lifecycle:
New from this manufacturer.
Delivery:
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