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PDF MAX2740 Data sheet ( Hoja de datos )
| Número de pieza | MAX2740 | |
| Descripción | Integrated GPS Receiver and Synthesizer | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1670; Rev 0; 4/00
Integrated GPS Receiver and Synthesizer
General Description
The MAX2740 is a complete global positioning system
(GPS) receiver from antenna output to digitizer input.
The signal path includes the LNA, two downconverters,
and variable-gain and fixed-gain amplifiers. By utilizing
a double-conversion superheterodyne architecture with
external surface acoustic wave (SAW) filters, high levels
of image rejection and blocking immunity are possible.
Receiver linearity has been maximized to improve oper-
ation in hostile RFI environments found in cellular base
stations. The MAX2740 also includes a high-perfor-
mance voltage-controlled oscillator (VCO) with low
phase noise for subcentimeter carrier phase applica-
tions, and a fixed-frequency synthesizer for generation
of all required on-chip local oscillators.
The unique frequency plan captured in the MAX2740 is
suitable for joint GPS/GLONASS receivers with minimal
external components. This allows the MAX2740 to pro-
vide a cost-effective and high-performance solution for
navigation and timing products that need maximum
satellite availability.
The MAX2740 is compatible with a high-performance
DSP engine capable of very fast time to first fix and
excellent multipath rejection.
________________________Applications
Base Station Timing
E911 Location Assistance
GPS Automotive and Consumer Receivers
Wireless Local-Loop Timing
Joint GPS/GLONASS Receivers
High-Precision Timing for SDH Networks
High-Positional-Accuracy Surveying Equipment
Features
o High Selectivity for Hostile Base Station
Environments
o Complete Antenna-to-Baseband Receiver
Solution
o >100dB Total Receiver Gain Including All Filter
Losses
o >50dB Automatic Gain Control (AGC) Range
o Fully Balanced Topology for Minimum Spurious
Responses
o Low Phase Noise VCO for Carrier Phase
Applications
o Compatible with High-Performance Companion
DSP
PART
MAX2740ECM
*Exposed paddle
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
48 TQFP-EP*
Pin Configuration/
Functional Diagram
GND
GND
LNA_IN
GND
GND
GND
RFMIX_IN-
GC
VCC_ANA
GND
GND
VCC_VCO
1
2
3
4
5
6
7
8
9
10
11
12
MAX2740
/2 /6
/8
/6
PFD
36 IFMIX_OUT+
35 IFMIX_OUT-
34 VGA_IN+
33 VGA_IN-
32 GND
31 VGA_OUT+
30 VGA_OUT-
29 GND
28 FGA_IN+
27 FGA_IN-
26 GND
25 FGA_OUT+
48
TQFP
ACTUAL SIZE
9mm x 9mm
TQFP-EP
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Integrated GPS Receiver and Synthesizer
Pin Description (continued)
PIN NAME
FUNCTION
43 RFMIX_OUT- RF Mixer Inverted Input (same as RFMIX_OUT+)
44
RFMIX_OUT+
Open Emitter Output of the RF Downconverter. This pin requires an external pull-down resistor of
1.2kΩ to establish the correct on-chip bias conditions. Requires a blocking capacitor.
45
VCC_RFMIX
Supply Voltage Pin for RF Downconverter. This pin requires external decoupling of typically
100pF.
46 RFMIX_IN Input to RF Mixer. Requires a blocking capacitor that may be used as part of the match network.
48 LNA_OUT LNA Output. Requires a pull-up inductor and a blocking capacitor. These may be configured as
the matching network.
AGC
GAIN SET
MAX2740
VCC
MAX4122
1
2
3
4
5
6
7
8
9
10
11
12
/2 /6
/8
/6
PFD
20MHz
36
35
34
33
32
31
30
29
28
27
26
25
TO DSP
MAX4122
Figure 1. Typical Application Circuit
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX2740.PDF ] | |
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