MAX2740 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Integrated GPS Receiver and Synthesizer

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 1
GND 2
LNA_IN 3
GND 4
GND 5
GND 6
RFMIX_IN- 7
GC 8
VCC_ANA 9
GND 10
GND 11
VCC_VCO 12
MAX2740
/2
/6
/6
/8
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 [phone].
For small orders, phone [phone].