Integrated Receiver Synthesizer MAX2740 complete global positioni

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Integrated Receiver Synthesizer MAX2740 complete global positioni

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19-1670; 4/00
Integrated Receiver Synthesizer
MAX2740 complete global positioning system (GPS) receiver from antenna output digitizer input. signal path includes LNA, downconverters, variable-gain fixed-gain amplifiers. utilizing double-conversion superheterodyne architecture with external surface acoustic wave (SAW) filters, high levels image rejection blocking immunity possible. Receiver linearity been maximized improve operation hostile environments found cellular base stations. MAX2740 also includes high-performance voltage-controlled oscillator (VCO) with phase noise subcentimeter carrier phase applications, fixed-frequency synthesizer generation required on-chip local oscillators. unique frequency plan captured MAX2740 suitable joint GPS/GLONASS receivers with minimal external components. This allows MAX2740 provide cost-effective high-performance solution navigation timing products that need maximum satellite availability. MAX2740 compatible with high-performance engine capable very fast time first excellent multipath rejection.
Features
High Selectivity Hostile Base Station Environments Complete Antenna-to-Baseband Receiver Solution >100dB Total Receiver Gain Including Filter Losses >50dB Automatic Gain Control (AGC) Range Fully Balanced Topology Minimum Spurious Responses Phase Noise Carrier Phase Applications Compatible with High-Performance Companion
MAX2740
Ordering Information
PART MAX2740ECM *Exposed paddle TEMP. RANGE -40°C +85°C PIN-PACKAGE TQFP-EP*
_Applications
Base Station Timing E911 Location Assistance Automotive Consumer Receivers Wireless Local-Loop Timing Joint GPS/GLONASS Receivers High-Precision Timing Networks High-Positional-Accuracy Surveying Equipment
LNA_IN RFMIX_INGC VCC_ANA VCC_VCO
Configuration/ Functional Diagram
LNA_OUT RFMIX_IN+ VCC_RFMIX RFMIX_OUT+ RFMIX_OUTGND VCC_IFMIX IFMIX_IN+ IFMIX_INGND
MAX2740
IFMIX_OUT+ IFMIX_OUTVGA_IN+ VGA_INGND VGA_OUT+ VGA_OUTGND FGA_IN+ FGA_INGND FGA_OUT+
TQFP ACTUAL SIZE
Maxim Integrated Products
TANK VCC_DIG DOWN GLS_OUT REF_IN FGA_OUT-
TQFP-EP
free samples latest literature, visit www.maxim-ic.com phone 1-800-998-8800. small orders, phone 1-800-835-8769.
Integrated Receiver Synthesizer MAX2740
ABSOLUTE MAXIMUM RATINGS
Pins .-0.3V +4.3V Input Power .+10dBm Input Power.+10dBm Input Voltage .-0.3 (VCC 0.3V) Continuous Power Dissipation +85°C) 48-Pin TQFP-EP Package .800mW Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +160°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +2.7V +3.3V, -40°C +85°C. Typical values +3.0, +25°C.)
PARAMETER Total Supply Current Voltage Range Current CONDITIONS 55.1 84.3 UNITS
ELECTRICAL CHARACTERISTICS
(MAX2740 kit, +3.0V, system impedance, 1575.42MHz, FIF1 135.42MHz, FIF2 15.42MHz, FREF 20MHz 600mVpp, +25°C, unless otherwise noted.)
PARAMETER Gain Gain Variation Over Temperature Input Third-Order Intercept Point Noise Figure MIXER differential) Mixer Conversion Gain Mixer Input Mixer Noise Figure (SSB) MIXER differential, differential) Mixer Conversion Gain VARIABLE-GAIN AMPLIFIER (VGA) differential) Voltage Gain Maximum Gain Setting Voltage Gain Minimum Gain Setting FIXED GAIN AMPLIFIER (FGA) Voltage Gain Compression (Output) 2.5V 0.5V 15.1 -54.7 36.3 (Note 22.6 -22.4 11.0 (Note Relative ambient (Note (Note 13.1 -1.3 16.0 ±0.5 -9.4 17.2 +1.0 CONDITIONS UNITS
differential
39.8 2.05
Vp-p
Integrated Receiver Synthesizer
ELECTRICAL CHARACTERISTICS (continued)
(MAX2740 kit, +3.0V, system impedance, 1575.42MHz, FIF1 135.42MHz, FIF2 15.42MHz, FREF 20MHz 600mVpp, +25°C, unless otherwise noted.)
PARAMETER Synthesizer Phase Noise Output Frequency External GLONASS Tuner Magnitude GLS_OUT Swing Down Outputs 500, 10pF (UP-DOWN) CONDITIONS -91.5 UNITS dBc/Hz mVp-p VOLTAGE-CONTROLLED OSCILLATOR (VCO) (100kHz offset)
MAX2740
Note Guaranteed design characterization. Note tones -35dBm tone, 1575MHz, 1576MHz. Note tones -40dBm tone, 1575MHz, 1576MHz.
Typical Operating Characteristics
+25°C, unless otherwise noted.)
GAIN TEMPERATURE
MAX2740-01 MAX2740-02
TEMPERATURE
CURRENT (mA) TEMPERATURE (°C) 2.7V 3.0V 3.3V
GAIN (dB) TEMPERATURE (°C) 2.7V 3.0V 3.3V
MIXER GAIN TEMPERATURE
3.3V 3.0V GAIN (dB) 2.7V
MAX2740-06
TEMPERATURE (°C)
MIXER GAIN TEMPERATURE
MAX2740-03
GAIN TEMPERATURE 3.0V
MAX2740-04
GAIN TEMPERATURE
GAIN (dB) 2.7V 3.3V 3.0V
MAX2740-05
GAIN (dB) TEMPERATURE (°C) 2.7V 3.3V 3.0V
GAIN (dB) CONTROL VOLTAGE +25°C +85°C -40°C
TEMPERATURE (°C)
Integrated Receiver Synthesizer MAX2740
Description
paddle NAME FUNCTION
Ground. Connect ground.
LNA_IN RFMIX_INGC VCC_ANA VCC_VCO TANK VCC_DIG DOWN GLS_OUT REF_IN FGA_OUTFGA_OUT+ FGA_INFGA_IN+ VGA_OUTVGA_OUT+ VGA_INVGA_IN+ IFMIX_OUTIFMIX_OUT+ IFMIX_INIFMIX_IN+ VCC_IFMIX
Input Circuit. Matching network blocking capacitor required. Input unused side differential pair that forms section Gilbert cell mixer. This should AC-grounded through 100pF. Control Voltage Setting Gain Level VGA. High input impedance. Voltage range 0.5V 2.5V. Supply Voltage Analog Circuits. This requires external decoupling typically 0.01µF. Supply Voltage Circuit. This requires external decoupling typically 1000pF. Resonator Pin. resonator required this pin. Supply Voltage Digital Section This requires external decoupling typically 0.01µF. Down Output from Phase-Frequency Detector. This pulses high whenever phase leads phase reference. Output from Phase-Frequency Detector. This pulses high whenever phase lags phase reference. Output Buffer that Provides 90MHz Clock Signal. Requires external blocking capacitor. Reference Input Synthesizer Inverted Output. Blocking capacitor required. Noninverted Output. Blocking capacitor required. Inverted Input. Blocking capacitor required. Noninverted Input. Blocking capacitor required. Inverted Output. Blocking capacitor required. Noninverted Output. Blocking capacitor required. Inverted Input. Blocking capacitor required. Noninverted Input. Blocking capacitor required. Mixer Inverted Output. Blocking capacitor required. Mixer Noninverted Output. Blocking capacitor required. Mixer Inverted Input. Blocking capacitor required. Mixer Noninverted Input. Blocking capacitor required. Supply Voltage Downconverter. This requires external decoupling typically 1000pF.
Integrated Receiver Synthesizer
Description (continued)
NAME RFMIX_OUTRFMIX_OUT+ VCC_RFMIX RFMIX_IN LNA_OUT FUNCTION Mixer Inverted Input (same RFMIX_OUT+) Open Emitter Output Downconverter. This requires external pull-down resistor 1.2k establish correct on-chip bias conditions. Requires blocking capacitor. Supply Voltage Downconverter. This requires external decoupling typically 100pF. Input Mixer. Requires blocking capacitor that used part match network. Output. Requires pull-up inductor blocking capacitor. These configured matching network.
MAX2740
MAX2740
GAIN
MAX4122
20MHz
MAX4122
Figure Typical Application Circuit
Integrated Receiver Synthesizer MAX2740
Applications Information
Figure shows typical application diagram which MAX2740 should used. front consists antenna interface, MAX2740, control loops (one AGC, other synthesizer), appropriate external components, including filters image rejection channel selectivity, operational amplifiers control loops, resonator tuning network VCO. Only antenna input, external 20MHz frequency reference, input from accompanying required. differential output provided from MAX2740, which applied either external analog-to-digital conversion circuitry directly companion DSP.
Variable-Gain Amplifier
This circuit compensates receiver gain variation unknown antenna cable losses. Under these conditions, receiver will exhibit minimum implementation loss. circuit useful gain control range greater than 50dB, with maximum gain level 16dB.
Fixed-Gain Amplifier
This circuit been designed deliver 40dB differential gain frequency 15.42MHz. differential inputs received from outputs through balanced lowpass filter circuit. circuit's differential output designed drive digitizer with typical load impedance differential.
Voltage-Controlled Oscillator
core L-band based commoncollector Colpitts topology. This circuit been optimized thermal noise high signal swing without asymmetrical clipping. circuit designed with lumped inductor low-cost applications. self-resonance should above 1440MHz that parallel varactor tuning internal capacitance produces resonance 1440MHz.
Low-Noise Amplifier
This subcircuit requires input output matching. input match typically series capacitor, output typically shunt inductor series capacitor.
Mixer
input matched externally. match consists series inductor shunt capacitor. source impedance this circuit single-ended, used image reject filter. second input brought separate grounding. This ensures ground impedance over wide band minimizes amplification noise frequency generated within mixer structure. output delivered through low-output-impedance emitter followers suitable directly driving 135MHz with typical impedance 400. deliberate mismatch keeps group delay distortion within acceptable level.
Synthesizer
digital prescaler accepts output from oscillator's differential digital buffer divides frequency from 1.44GHz 120MHz 20MHz phase-frequency detector, 90MHz GLONASS reference output. Divider blocks arranged ensure that drive minimum duty cycle distortion. simple output buffer used deliver GLONASS reference signal typical external load impedance 500. phase-frequency detector classical dual flipflop with ANDed feedback reset function. DOWN outputs provided through emitter follower buffers. These outputs deliver pulse-width-modulated signals that phase-acquisition mode give phase detector range With lock, either DOWN output will active drive frequency toward reference frequency. phase detector outputs feed directly into active, lead-lag differential loop filter.
Mixer
downconverter receives differential 135.42MHz from delivers differential signal 15.42MHz. circuit been optimized deliver high level conversion gain with adequate IIP3 noise figure. circuit terminated input with differential establish correct embedding impedance SAW. emitter follower outputs drive directly into high-impedance, differential, three-pole lowpass discrete lumped element filter.
Integrated Receiver Synthesizer
Package Information
48L,TQFP.EPS
MAX2740
Integrated Receiver Synthesizer MAX2740
NOTES
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2000 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

Integrated Receiver Synthesizer MAX2740 complete global positioni

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