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MAX2769
Technical data
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MAXIM MAX2769 Technical data

General Description
The MAX2769 is the industry’s first global navigation satellite system (GNSS) receiver covering GPS, GLONASS, and Galileo navigation satellite systems on a single chip. This single-conversion, low-IF GNSS receiver is designed to provide high performance for a wide range of consumer applications, including mobile handsets.
The MAX2769 completely eliminates the need for external IF filters by implementing on-chip monolithic filters and requires only a few external components to form a com­plete low-cost GPS receiver solution.
The MAX2769 is the most flexible receiver on the market. The integrated delta-sigma fractional-N frequency synthesizer allows programming of the IF frequency within a ±40Hz accuracy while operating with any refer­ence or crystal frequencies that are available in the host system. The integrated ADC outputs 1 or 2 quan­tized bits for both I and Q channels, or up to 3 quan­tized bits for the I channel. Output data is available either at the CMOS logic or at the limited differential logic levels.
The MAX2769 is packaged in a compact 5mm x 5mm, 28-pin thin QFN package with an exposed paddle. The part is also available in die form. Contact the factory for further information.
Applications
Location-Enabled Mobile Handsets
PNDs (Personal Navigation Devices)
PMPs (Personal Media Players)
PDAs (Personal Digital Assistants)
In-Vehicle Navigation Systems
Telematics (Asset Tracking, Inventory Management)
Recreational/Marine Navigation/Avionics
Software GPS
Laptops and Ultra-Mobile PCs
Digital Still Cameras and Camcorders
Features
o GPS/GLONASS/Galileo Receivers o No External IF SAW or Discrete Filters Required o Programmable IF Frequency o Fractional-N Synthesizer with Integrated VCO
Supports Wide Range of Reference Frequencies
o Dual-Input Uncommitted LNA for Separate
Passive and Active Antenna Inputs
o 1.4dB Cascade Noise Figure o Integrated Crystal Oscillator o Integrated Active Antenna Sensor o 10mA Supply Current in Low-Power Mode o 2.7V to 3.3V Supply Voltage o Small, 28-Pin, RoHS-Compliant, Thin QFN Lead-
Free Package (5mm x 5mm)
MAX2769
Universal GPS Receiver
________________________________________________________________
Maxim Integrated Products
1
Pin Configuration/Block Diagram
Ordering Information
19-0791; Rev 2; 6/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed paddle.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX2769ETI+ -40°C to +85°C 28 Thin QFN-EP*
MAX2769E/W -40°C to +85°C Dice (In Wafer Form)
N.C.
VCCIF
IDLE
LNA2
PGM
LNA1
TSENS
I0
20
21
22
+
1
ADC
LNA2
LNA1
ANTFLAG
MAX2769
FILTER
2
LNAOUT
23
24
25
26
27
28
Q0
VCCADC
19 17 16
3 5
ANTBIAS
Q1I1CLKOUT
18
ADC
PLL
900
4 6
MIXIN
VCCRF
VCO
3-WIRE
INTERFACE
LD
XTAL
15
14
VCCD
VCCCP
13
CPOUT
12
VCCVCO
11
CS
10
9
SCLK
8
SDATA
7
SHDN
MAX2769
Universal GPS Receiver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(MAX2769 EV kit, VCC= 2.7V to 3.3V, TA= -40°C to +85°C, PGM = GND. Registers are set to the default power-up states. Typical values are at V
CC
= 2.85V and TA= +25°C, unless otherwise noted.) (Note 1)
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.
VCCto GND...........................................................-0.3V to +4.2V
Other Pins to GND ..................-0.3V to +(Operating V
CC
+ 0.3V)
Maximum RF Input Power ..............................................+15dBm
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Thin QFN (derates 27mW/°C above +70°C)...2500mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (TQFN only, soldering, 10s) ..............+300°C
Soldering Temperature (reflow) .......................................+260°C
Idle Mode is a trademark of Maxim Integrated Products, Inc.
CAUTION! ESD SENSITIVE DEVICE
Supply Voltage 2.7 2.85 3.3 V
Supply Current
Voltage Drop at ANTBIAS from VCCRF
S hor t- C i r cui t P r otecti on C ur r ent at AN TBIAS
Acti ve Antenna D etecti on C ur r ent To asser t l og i c- hi g h at AN TFLAG 1.1 mA
DIGITAL INPUT AND OUTPUT
Digital Input Logic-High Measure at the SHDN pin 1.5 V Digital Input Logic-Low Measure at the SHDN pin 0.4 V
PARAMETER CONDITIONS MIN TYP MAX UNITS
Default mode, LNA1 is active (Note 2) 15 18 22
Default mode, LNA2 is active (Note 2) 12 15 19 Idle Mode™, IDLE = low 1.5 Shutdown mode, SHDN = low 20 μA
Sourcing 20mA at ANTBIAS 0.2 V
AN TBIAS i s shor ted to g r ound 57 mA
mA
MAX2769
Universal GPS Receiver
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(MAX2769 EV kit, VCC= 2.7V to 3.3V, TA= -40°C to +85°C, PGM = GND. Registers are set to the default power-up states. LNA input is driven from a 50Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kΩ || 7.5pF on each pin. Typical values are at V
CC
= 2.85V and TA= +25°C, unless otherwise noted.) (Note 1)
CASCADED RF PERFORMANCE
RF Frequency L1 band
Out-of-Band 3rd-Order Input Intercept Point
In-Band Mixer Input Referred 1dB Compression Point
Mixer Input Return Loss 10 dB
Image Rejection 25 dB
Spurs at LNA1 Input
Maximum Voltage Gain Measured from the mixer to the baseband analog output 91 96 103 dB
Variable Gain Range 55 59 dB
FILTER RESPONSE
Passband Center Frequency 4 MHz
Lowpass 3dB Bandwidth FBW = 11 9 MHz
Stopband Attenuation
LNA
LNA1 INPUT
Power Gain 19 dB
Noise Figure 0.83 dB
Input IP3 (Note 5) -1.1 dBm
Output Return Loss 10 dB
Intput Return Loss 8dB
LNA2 INPUT
Power Gain 13 dB
Noise Figure 1.14 dB
Input IP3 (Note 5) 1 dBm
Output Return Loss 19 dB
Input Return Loss 11 dB
PARAMETER CONDITIONS MIN TYP MAX UNITS
1575.42
LNA1 input active, default mode (Note 3) 1.4
LNA2 input active, default mode (Note 3) 2.7Noise Figure
Measured at the mixer input 10.3
Measured at the mixer input (Note 4) -7 dBm
Measured at the mixer input -85 dBm
LO leakage -101
Reference harmonics leakage -103
FBW = 00 2.5
FBW = 10 4.2Passband 3dB Bandwidth
FBW = 01 8
3r d- or der fi l ter , band wi d th = 2.5M Hz, measur ed at 4M H z offset 30
5th- or der fi l ter , band wi d th = 2.5M Hz, measur ed at 4M H z offset 41 49.5
MHz
dB
dBm
MHz
dB
MAX2769
Universal GPS Receiver
4 _______________________________________________________________________________________
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2769 EV kit, VCC= 2.7V to 3.3V, TA= -40°C to +85°C, PGM = GND. Registers are set to the default power-up states. LNA input is driven from a 50Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kΩ || 7.5pF on each pin. Typical values are at V
CC
= 2.85V and TA= +25°C, unless otherwise noted.) (Note 1)
Note 1: MAX2769 is production tested at TA = +25°C. All min/max specifications are guaranteed by design and characterization
from -40°C to +85°C, unless otherwise noted. Default register settings are not production tested or guaranteed. User must program the registers upon power-up.
Note 2: Default, low-NF mode of the IC. LNA choice is gated by the ANT_FLAG signal. In the normal mode of operation without an
active antenna, LNA1 is active. If an active antenna is connected and ANT_FLAG switches to 1, LNA1 is automatically disabled and LNA2 becomes active. PLL is in an integer-N mode with f
COMP
= f
TCXO
/ 16 = 1.023MHz and ICP= 0.5mA. The complex IF filter is configured as a 5th-order Butterworth filter with a center frequency of 4MHz and bandwidth of 2.5MHz. Output data is in a 2-bit sign/magnitude format at CMOS logic levels in the I channel only.
Note 3: The LNA output connects to the mixer input without a SAW filter between them. Note 4: Two tones are located at 12MHz and 24MHz offset frequencies from the GPS center frequency of 1575.42MHz
at -60dBm/tone. Passive pole at the mixer output is programmed to be 13MHz.
Note 5: Measured from the LNA input to the LNA output. Two tones are located at 12MHz and 24MHz offset frequencies from the
GPS center frequency of 1575.42MHz at -60dBm per tone.
FREQUENCY SYNTHESIZER
LO Frequency Range 0.4V < V
LO Tuning Gain 57 MHz/V
Reference Input Frequency 8 44 MHz
Main Divider Ratio 36 32,767 —
Reference Divider Ratio 1 1023 —
Charge-Pump Current
TCXO INPUT BUFFER/OUTPUT CLOCK BUFFER
Reference Input Level Sine wave 0.4 V
Clock Output Multiply/Divide Range
ADC
ADC Differential Nonlinearity AGC enabled, 3-bit output ±0.1 LSB
ADC Integral Nonlinearity AGC enabled, 3-bit output ±0.1 LSB
PARAMETER CONDITIONS MIN TYP MAX UNITS
< 2.4V 1550 1610 MHz
TUNE
ICP = 0 0.5
ICP = 1 1
÷4 x2 —
mA
P-P
MAX2769
Universal GPS Receiver
_______________________________________________________________________________________
5
Typical Operating Characteristics
(MAX2769 EV kit, VCC= 2.7V to 3.3V, TA= -40°C to +85°C, PGM = GND. Registers are set to the default power-up states. LNA input is driven from a 50Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kΩ || 7.5pF on each pin. Typical values are at V
CC
= 2.85V and TA= +25°C, unless otherwise noted.)
CASCADED RECEIVER GAIN (dB)
CASCADED RECEIVER GAIN
vs. PGA GAIN CODE
120
100
80
60
40
065
TA = -40°C
TA = +25°C
TA = +85°C
PGA GAIN CODE (DECIMAL FORMAT)
MAX2769 toc01
60555045403530252015105
CASCADED GAIN AND NOISE FIGURE
vs. TEMPERATURE
2.0
1.5 AGC GAIN
1.0
NOISE FIGURE (dB)
0.5
0
-40 85 TEMPERATURE (°C)
LNA1 GAIN AND NOISE FIGURE
vs. LNA1 BIAS DIGITAL CODE
1.6
1.4
1.2
1.0
0.8
0.6
NOISE FIGURE (dB)
0.4
0.2
0
115
GAIN
NOISE FIGURE
LNA BIAS DIGITAL CODE (DECIMAL)
MAX2769 toc04
14132 3 4 6 7 8 9 10 115 12
25
20
15
10
5
0
LNA1 GAIN (dB)
NOISE FIGURE
MAX2769 toc02
603510-15
120
115
110
105
100
95
90
40
30
20
10
0
-10
CASCADED GAIN
-20
LNA1 |S21| AND |S12| (dB)
-30
-40
-50
0.50 2.50
LNA1 GAIN AND NOISE FIGURE
vs. TEMPERATURE
1.4 LNA BIAS = 1000
1.2
1.0
0.8
0.6
NOISE FIGURE (dB)
0.4
NOISE FIGURE
0.2
0
-40 85 TEMPERATURE (°C)
GAIN
LNA1 |S21| AND |S12|
vs. FREQUENCY
|S21|
|S12|
FREQUENCY (GHz)
MAX2769 toc05
19.6
19.4
19.2
19.0
18.8
18.6 LNA1 GAIN (dB)
18.4
18.2
18.0
603510-15
17.8
2.252.001.50 1.751.00 1.250.75
MAX2769 toc03
MAX2769
Universal GPS Receiver
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(MAX2769 EV kit, VCC= 2.7V to 3.3V, TA= -40°C to +85°C, PGM = GND. Registers are set to the default power-up states. LNA input is driven from a 50Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kΩ || 7.5pF on each pin. Typical values are at V
CC
= 2.85V and TA= +25°C, unless otherwise noted.)
-10.0
-12.5
LNA1 INPUT 1dB COMPRESSION POINT (dBm)
-15.0
LNA1 INPUT 1dB COMPRESSION POINT
vs. LNA1 BIAS DIGITAL CODE
5.0
2.5
0
-2.5
-5.0
-7.5
115
LNA BIAS DIGITAL CODE (DECIMAL)
14132 3 4 6 7 8 9 10 115 12
30
20
MAX2769 toc06
10
0
-10
-20
LNA2 |S21| AND |S12| (dB)
-30
-40
-50
0.50 2.50
LNA2 |S21| AND |S12|
vs. FREQUENCY
FREQUENCY (GHz)
|S21|
|S12|
LNA2 GAIN AND NOISE FIGURE
vs. TEMPERATURE
2.0 LNA BIAS = 10
1.8
MAX2769 toc07
1.6
1.4
1.2
1.0
0.8
NOISE FIGURE (dB)
2.252.000.75 1.00 1.25 1.50 1.75
NOISE FIGURE
0.6
0.4
0.2
0
-40 85
GAIN
TEMPERATURE (°C)
MAX2769 toc08
603510-15
13.6
13.4
13.2
13.0
12.8
12.6
12.4
12.2
LNA2 GAIN (dB)
LNA INPUT RETURN LOSS
vs. FREQUENCY
0
LNA1
-10
-20
-30
LNA INPUT RETURN LOSS (dB)
-40
-50
1.0 2.2
LNA2
FREQUENCY (GHz)
LNA OUTPUT RETURN LOSS
vs. FREQUENCY
0
MAX2769 toc09
-5
LNA1
-10
-15
LNA OUTPUT RETURN LOSS (dB)
2.12.01.91.81.71.61.51.41.31.21.1
-20
LNA2
1.0 2.2 FREQUENCY (GHz)
MAX2769 toc10
MIXER INPUT REFERRED IP1dB (dB)
2.12.01.91.81.71.61.51.41.31.21.1
MIXER INPUT REFERRED IP1dB
vs. OFFSET FREQUENCY
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
PGA GAIN = 32dB
PGA GAIN = 51dB
PRF = -100dBm
0 300
OFFSET FREQUENCY (MHz)
MAX2769 toc11
25020015010050
MAX2769
Universal GPS Receiver
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(MAX2769 EV kit, VCC= 2.7V to 3.3V, TA= -40°C to +85°C, PGM = GND. Registers are set to the default power-up states. LNA input is driven from a 50Ω source. All RF measurements are done in the analog output mode with ADC bypassed. PGA gain is set to 51dB gain by serial-interface word GAININ = 111010. Maximum IF output load is not to exceed 10kΩ || 7.5pF on each pin. Typical values are at V
CC
= 2.85V and TA= +25°C, unless otherwise noted.)
5TH-ORDER POLYPHASE FILTER MAGNITUDE
RESPONSE vs. BASEBAND FREQUENCY
MAX2769 toc15
BASEBAND FREQUENCY (MHz)
MAGNITUDE (dB)
98765432
-60
-50
-40
-30
-20
-10
0
10
-70 110
MIXER INPUT REFERRED GAIN
vs. PGA GAIN CODE
MAX2769 toc16
PGA GAIN CODE (DECIMAL FORMAT)
MIXER INPUT REFERRED GAIN (dB)
60555045403530252015105
40
60
80
100
20
065
TA = +25°C
TA = -40°C
TA = +85°C
JAMMER POWER (dBm)
1dB CASCADED NOISE FIGURE DESENSITIZATION vs. JAMMER FREQUENCY
0
-5
-10
-15
-20 800 950
MAX2769 toc12a
925900875850825
JAMMER FREQUENCY (MHz)
3RD-ORDER POLYPHASE FILTER MAGNITUDE
RESPONSE vs. BASEBAND FREQUENCY
10
MAX2769 toc12b
205020001950190018501800 2100
MIXER INPUT REFERRED NOISE FIGURE
vs. PGA GAIN
16
14
12
10
8
MIXER INPUT REFERRED NOISE FIGURE (dB)
6
565
PGA GAIN (dB)
5545352515
MAX2769 toc13
0
-10
-20
-30
MAGNITUDE (dB)
-40
-50
-60
110
BASEBAND FREQUENCY (MHz)
MAX2769 toc14
98765432
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