19-5875; Rev 0; 5/11
EVALUATION KIT AVAILABLE
MAX2769B
Universal GPS Receiver
General Description
The MAX2769B is a next-generation Global Navigation
Satellite System (GNSS) receiver covering GPS, GLONASS,
Galileo, and Compass navigation satellite systems on
a single chip. This single-conversion GNSS receiver is
designed to provide high performance for industrial and
automotive applications.
Designed on Maxim’s advanced, low-power SiGe BiCMOS
process technology, the MAX2769B offers the highest
performance and integration at a low cost. Incorporated
on the chip is the complete receiver chain, including a
dual-input LNA and mixer, followed by the image-rejected
filter, PGA, VCO, fractional-N frequency synthesizer,
crystal oscillator, and a multibit ADC. The total cascaded
noise figure of this receiver is as low as 1.4dB.
The MAX2769B completely eliminates the need for exter-
nal IF filters by implementing on-chip monolithic filters
and requires only a few external components to form a
complete low-cost GPS RF receiver solution.
The MAX2769B is the most flexible receiver on the mar-
ket. The integrated delta-sigma fractional-N frequency
synthesizer allows programming of the IF frequency
within a ±30Hz (f
XTAL
= 32MHz) accuracy while operat-
ing with any reference or crystal frequencies that are
available in the host system. The ADC outputs CMOS
logic levels with 1 or 2 quantized bits for both I and Q
channels, or up to 3 quantized bits for the I channel. I and
Q analog outputs are also available.
The MAX2769B is packaged in a 5mm x 5mm, 28-pin thin
QFN package with an exposed paddle.
S
AEC-Q100 Automotive Qualified
S
GPS/GLONASS/Galileo/Compass Systems
S
40pF Output Clock Drive Capability
S
No External IF SAW or Discrete Filters Required
S
Programmable IF Frequency
S
Fractional-N Synthesizer with Integrated VCO
Supports Wide Range of Reference Frequencies
S
Dual-Input Uncommitted LNA for Separate Passive
and Active Antenna Inputs
S
1.4dB Cascade Noise Figure
S
Integrated Crystal Oscillator
S
Integrated Active Antenna Sensor
S
2.7V to 3.3V Supply Voltage
S
Small, 28-Pin, RoHS-Compliant, Thin QFN Lead-
Free Package (5mm x 5mm)
Ordering Information
appears at end of data sheet.
Features
Block Diagram
V
CC_ADC
CLKOUT
XTAL
15
14
ADC
ADC
V
CCD
V
CC_CP
CPOUT
13
PLL
12
Q0
21
N.C. 22
20
19
18
Q1
17
I1
I0
16
Applications
Automotive Navigation Systems
Location-Enabled Mobile Handsets
PNDs (Personal Navigation Devices)
Telematics (Asset Tracking, Inventory
Management)
Marine/Avionics Navigation
Software GPS
Laptops and Netbooks
V
CC_IF
23
MAX2769B
IDLE 24
FILTER
LNA2 25
90
LNA2
VCO
11
V
CC_VCO
PGM 26
10
3-WIRE
INTERFACE
CS
LNA1 27
0
LNA1
9
SCLK
N.C. 28
+
1
ANTFLAG
2
LNAOUT
3
ANTBIAS
4
V
CC_RF
5
MIXIN
6
LD
7
SHDN
8
SDATA
For related parts and recommended products to use with this part,
refer to
www.maxim-ic.com/MAX2769B.related.
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Maxim Integrated Products
1
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.
MAX2769B
Universal GPS Receiver
ABSOLUTE MAXIMUM RATINGS
V
CC_
to Ground ....................................................-0.3V to +4.2V
Other Pins Except LNA_, MIXIN, XTAL, and LNAOUT to
Ground............................. -0.3V to +(Operating V
CC_
+ 0.3V)
Maximum RF Input Power ............................................. +15dBm
Continuous Power Dissipation (T
A
= +70NC)
TQFN (derates 27mW/NC above +70NC) ...................2500mW
Operating Temperature Range .......................... -40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
CAUTION!
ESD SENSITIVE DEVICE
DC ELECTRICAL CHARACTERISTICS
(MAX2769B EV kit, V
CC_
= 2.7V to 3.3V, T
A
= -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. Typical
values are at V
CC_
= 2.85V and T
A
= +25NC, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
Default mode, LNA1 is active (Note 2)
Supply Current
Default mode, LNA2 is active (Note 2)
Idle ModeK,
IDLE
= low,
SHDN
= high
Shutdown mode,
SHDN
= low
Voltage Drop at ANTBIAS from
V
CC_RF
Short-Circuit Protection Current at
ANTBIAS
Active Antenna Detection Current
DIGITAL INPUT AND OUTPUT
Digital Input Logic-High
Digital Input Logic-Low
Measure at the
SHDN
pin
Measure at the
SHDN
pin
1.5
0.4
V
V
Sourcing 20mA at ANTBIAS
ANTBIAS is shorted to ground
To assert logic-high at ANTFLAG
CONDITIONS
MIN
2.7
18
15
TYP
2.85
27
25
5
200
0.2
57
1.1
FA
V
mA
mA
MAX
3.3
31
30.5
mA
UNITS
V
Idle Mode is a trademark of Maxim Integrated Products, Inc.
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Maxim Integrated Products
2
*The
parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
MAX2769B
Universal GPS Receiver
AC ELECTRICAL CHARACTERISTICS*
(MAX2769B EV kit, V
CC_
= 2.7V to 3.3V, T
A
= -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA
input is driven from a 50I 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 10kI||7.5pF on each pin. Typical
values are at V
CC_
= 2.85V and T
A
= +25NC, unless otherwise noted.) (Note 1)
PARAMETER
CASCADED RF PERFORMANCE
RF Frequency
Noise Figure
Out-of-Band 3rd-Order Input
Intercept Point
L1 band
LNA1 input active, default mode (Note 3)
LNA2 input active, default mode (Note 3)
Measured at the mixer input
Measured at the mixer input (Note 4)
1575.42
1.4
2.7
10.3
-7
-85
10
25
LO leakage
Reference harmonics leakage
Measured from the mixer to the baseband analog output
91
55
FBW = 00
Passband Center Frequency
FBW = 10
FBW = 01
FBW = 00
Passband 3dB Bandwidth
Lowpass 3dB Bandwidth
Stopband Attenuation
LNA
LNA1 INPUT
Power Gain
Noise Figure
Input IP3
Output Return Loss
Intput Return Loss
(Note 5)
19
0.83
-1.1
10
8
dB
dB
dBm
dB
dB
FBW = 10
FBW = 01
FBW = 11
3rd-order filter, bandwidth = 2.5MHz, measured at 4MHz offset
5th-order filter, bandwidth = 2.5MHz, measured at 4MHz offset
40
-101
-103
96
59
4
4
9.27
2.5
4.2
9.66
9
30
49.5
MHz
dB
MHz
MHz
103
dBm
dBm
dB
dB
dBm
dB
dB
dB
MHz
CONDITIONS
MIN
TYP
MAX
UNITS
In-Band Mixer Input Referred 1dB
Measured at the mixer input
Compression Point
Mixer Input Return Loss
Image Rejection
Spurs at LNA1 Input
Maximum Voltage Gain
Variable Gain Range
FILTER RESPONSE
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Maxim Integrated Products
3
*The
parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
MAX2769B
Universal GPS Receiver
AC ELECTRICAL CHARACTERISTICS* (continued)
(MAX2769B EV kit, V
CC_
= 2.7V to 3.3V, T
A
= -40NC to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA
input is driven from a 50I 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 10kI||7.5pF on each pin. Typical
values are at V
CC_
= 2.85V and T
A
= +25NC, unless otherwise noted.) (Note 1)
PARAMETER
LNA2 INPUT
Power Gain
Noise Figure
Input IP3
Output Return Loss
Input Return Loss
FREQUENCY SYNTHESIZER
LO Frequency Range
LO Tuning Gain
Reference Input Frequency
Main Divider Ratio
Reference Divider Ratio
Charge-Pump Current
ICP = 0
ICP = 1
8
With respect to ground, I
OH
= 10FA (DC-coupled)
With respect to ground, I
OL
= 10FA (DC-coupled)
Load = 10kW + 40pF, f
CLKOUT
= 32MHz
Sine wave
/4, /2, /1
(x2, max input frequency of 16MHz)
AGC enabled, 3-bit output
AGC enabled, 3-bit output
0.5
÷4
x2
11
10||40
2
0.8
8
36
1
0.5
1
32
0.2V < V
TUNE
< (V
CC_
- 0.3V)
1550
57
44
32,767
1023
1610
MHz
MHz/V
MHz
—
—
mA
(Note 5)
13
1.14
1
19
11
dB
dB
dBm
dB
dB
CONDITIONS
MIN
TYP
MAX
UNITS
TCXO INPUT BUFFER/OUTPUT CLOCK BUFFER
Frequency Range
Output Logic-Level High (V
OH
)
Output Logic-Level Low (V
OL
)
Capacitive Slew Current
Output Load
Reference Input Level
Clock Output Multiply/Divide
Range
ADC
ADC Differential Nonlinearity
ADC Integral Nonlinearity
Q0.1
Q0.1
LSB
LSB
MHz
V
V
mA
kI||pF
V
P-P
—
Note 1:
MAX2769B is production tested at T
A
= +25NC and +85NC. All min/max specifications are guaranteed by design and char-
acterization from -40NC to +85NC, unless otherwise noted. Default register settings are not production tested or guaran-
teed. 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 dis-
abled 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.
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Maxim Integrated Products
4
*The
parametric values (min, typ, max limits) shown in the Electrical Characteristics table supersede values quoted elsewhere in this data sheet.
MAX2769B
Universal GPS Receiver
Typical Operating Characteristics
(MAX2769B EV kit, V
CC_
= 2.7V to 3.3V, T
A
= -40°C to +85NC, PGM = Ground. Registers are set to the default power-up states. LNA
input is driven from a 50I 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 10kI||7.5pF on each pin. Typical
values are at V
CC_
= 2.85V and T
A
= +25NC, unless otherwise noted.)
CASCADED RECEIVER GAIN
vs. PGA GAIN CODE
MAX2769B toc01
CASCADED GAIN AND NOISE FIGURE
vs. TEMPERATURE
2.0
MAX2769B toc02
LNA1 |S21| AND |S12|
vs. FREQUENCY
30
LNA1 |S21| AND |S12| (dB)
20
10
0
-10
-20
-30
-40
-50
0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
FREQUENCY (GHz)
|S12|
|S21|
MAX2769B toc03
MAX2769B toc06
120
CASCADED RECEIVER GAIN (dB)
T
A
= -40°C
T
A
= +25°C
80
T
A
= +85°C
120
115
40
100
1.5
NOISE FIGURE (dB)
CASCADED GAIN
AGC GAIN
1.0
NOISE FIGURE
110
105
100
0.5
95
60
40
0 5 10 15 20 25 30 35 40 45 50 55 60 65
PGA GAIN CODE (DECIMAL FORMAT)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
90
LNA1 GAIN AND NOISE FIGURE
vs. LNA1 BIAS DIGITAL CODE
1.6
1.4
1.2
NOISE FIGURE (dB)
1.0
0.8
0.6
0.4
0.2
0
NOISE FIGURE
GAIN
LNA1 GAIN AND NOISE FIGURE
vs. TEMPERATURE
1.2
LNA1 GAIN (dB)
NOISE FIGURE (dB)
1.0
0.8
0.6
0.4
5
0
0.2
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
NOISE FIGURE
GAIN
19.4
19.2
LNA1 GAIN (dB)
19.0
18.8
18.6
18.4
18.2
18.0
17.8
LNA1 INPUT 1dB COMPRESSION POINT (dBm)
25
20
15
10
1.4
MAX2769B toc05
MAX2769B toc04
LNA1 INPUT 1dB COMPRESSION POINT
vs. LNA1 BIAS DIGITAL CODE
19.6
5.0
2.5
0
-2.5
-5.0
-7.5
-10.0
-12.5
-15.0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LNA BIAS DIGITAL CODE (DECIMAL)
LNA BIAS = 1000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LNA BIAS DIGITAL CODE (DECIMAL)
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Maxim Integrated Products
5
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