Rainbow Electronics MAX2740 - Manual

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
♦ High Selectivity for Hostile Base Station
Environments
♦ Complete Antenna-to-Baseband Receiver
Solution
♦ >100dB Total Receiver Gain Including All Filter
Losses
♦ >50dB Automatic Gain Control (AGC) Range
♦ Fully Balanced Topology for Minimum Spurious
Responses
♦ Low Phase Noise VCO for Carrier Phase
Applications
♦ Compatible with High-Performance Companion
DSP
MAX2740
Integrated GPS Receiver and Synthesizer
________________________________________________________________ Maxim Integrated Products 1
IFMIX_OUT+
IFMIX_OUT-
VGA_IN+
VGA_IN-
GND
VGA_OUT+
VGA_OUT-
GND
FGA_IN+
FGA_IN-
GND
FGA_OUT+
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
13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37
36
35
34
33
32
31
30
29
28
27
26
25
TANK
GND GND
VCC_DIG
DOWN
UP
GLS_OUT
REF_IN
GND GND GND
FGA_OUT-
LNA_OUT GND RFMIX_IN+ VCC_RFMIX RFMIX_OUT+ RFMIX_OUT- GND GND VCC_IFMIX IFMIX_IN+ IFMIX_IN- GND
TQFP-EP
/2 /6
/8 PFD
/6
MAX2740
ACTUAL SIZE
9mm x 9mm
48
TQFP
Pin Configuration/
Functional Diagram
19-1670; Rev 0; 4/00
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.
Ordering Information
48 TQFP-EP*
PIN-PACKAGE TEMP. RANGE
-40°C to +85°C MAX2740ECM
PART
*Exposed paddle