ATION EVALU ILABLE 1.2GHz with Linear Modulation Input Fully

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ATION EVALU ILABLE 1.2GHz with Linear Modulation Input Fully

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19-2102; 8/03
ATION EVALU ILABLE
1.2GHz with Linear Modulation Input
Fully Monolithic Construction with On-Chip Inductor Varactor Tuning Elements Guaranteed 1145MHz 1250MHz Tuning Range Support Applications Modulation Linearity Within Precise Modulation Gain (-500kHz/V) Phase Noise (-137dBc/Hz 4MHz offset) +2.7V +5.5V Single-Supply Operation Low-Current Shutdown Mode Miniature 8-Pin µMAX Package
General Description
MAX2754 self-contained, linear modulation, voltage-controlled oscillator (VCO) intended 2.4GHz 2.5GHz band, particularly modulation systems that utilize direct frequency-modulation transmit architecture. This device features linear modulation input addition standard frequency tuning input. frequency tuning range 1145MHz 1250MHz (1/2 also supports 110MHz with side based Maxim's proprietary monolithic technology, where components integrated on-chip, including varactor inductor. MAX2754 linear modulation input offers means directly modulate with constant modulation sensitivity over tuning voltage input range. Typical frequency deviation -500kHz/V which linear over guaranteed frequency limits. tuning input voltage range +0.4V +2.4V oscillator frequency factory adjusted provide guaranteed limits. oscillator signal buffered output amplifier stage (internally matched provide higher output power isolate oscillator from load impedance variations. MAX2754 operates over +2.7V +5.5V supply range. This device also provides digitally controlled shutdown mode permit implementation sophisticated power-supply management. shutdown, supply current reduced 0.2µA. Even when active, power consumption modest 41mW. MAX2754 packaged miniature 8-pin µMAX offer world's smallest, complete 2.4GHz directmodulation solution.
MAX2754
Ordering Information
PART MAX2754EUA TEMP RANGE -40°C +85°C PIN-PACKAGE µMAX
8-pin µMAX
(3mm 5mm)
Applications
HomeRF WLAN Bluetooth 2.4GHz Cordless Phones 2.4GHz Wireless Data Radios
330nF VREG
Typical Operating Circuit
BIAS 330nF
Configuration
VIEW
TUNE
TUNE
OSCILLATOR CORE
MIXER/ SYNTHESIZER
GND1
GND2 LINEAR MODULATION INTERFACE
VREG TUNE GND1
GND2 SHDN
MODULATION VOLTAGE SIGNAL SHDN SHDN
MAX2754
µMAX
MAX2754
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
1.2GHz with Linear Modulation Input MAX2754
ABSOLUTE MAXIMUM RATINGS
.-0.3V +6.0V VREG .-0.3V +6.0V TUNE, SHDN, GND.-0.3V (VCC 0.3V) .-0.3V +6.0V Continuous Power Dissipation +70°C) 8-Pin µMAX (derate 5.7mW/°C above +70°C) .457mW 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.
CAUTION! SENSITIVE DEVICE
ELECTRICAL CHARACTERISTICS
(VCC +2.7V +5.5V, VTUNE +0.4V +2.4V, SHDN +2.0V, VMOD +1.4V, connected load, -40°C +85°C. Typical values +3.0V, +25°C, unless otherwise noted.) (Note
PARAMETER Supply Voltage Supply Current Digital Input Voltage High Digital Input Voltage Digital Input Current High Digital Input Current Modulation Input Voltage Range TUNE Leakage Current (Note SYMBOL +25°C, SHDN 2.0V VMOD VTUNE +0.4V +2.4V SHDN 2.0V SHDN 0.6V 0.01 -40°C +85°C, SHDN 2.0V SHDN 0.6V CONDITIONS 13.7 16.4 UNITS
ELECTRICAL CHARACTERISTICS
(MAX2754 kit. +2.7V +5.5V, VTUNE +0.4V +2.4V, SHDN +2.0V, VMOD +1.4V, connected load, +25°C. Typical values +3.0V, +25°C, unless otherwise noted.) (Note
PARAMETER Oscillator Guaranteed Frequency Limits Phase Noise Tuning Gain Output Power Modulation Peak Frequency Deviation Modulation Sensitivity fMIN fMAX (Note Common-mode VMOD 1.4V ±400 SYMBOL fMIN, fMAX CONDITIONS VTUNE +0.4V +2.4V, -40°C +85°C fOFFSET 4MHz Noise floor VTUNE fMIN VTUNE fMAX 1145 -137 -151 ±500 -500 ±600 1250 UNITS dBc/Hz dBm/Hz MHz/V kHz/V
1.2GHz with Linear Modulation Input
ELECTRICAL CHARACTERISTICS (continued)
(MAX2754 kit. +2.7V +5.5V, VTUNE +0.4V +2.4V, SHDN +2.0V, VMOD +1.4V, connected load, +25°C. Typical values +3.0V, +25°C, unless otherwise noted.) (Note
PARAMETER Modulation Linearity Modulation Full-Power Bandwidth (Note Return Loss (Note Output Harmonics Load Pulling Supply Pushing Oscillator Turn-On Time (Note Oscillator Turn-Off Time (Note VSWR 2:1, phases stepped: +3.3V +2.8V fMIN fMAX SYMBOL CONDITIONS VMOD +0.4 +2.4V, fMIN fMAX (Note 0.16 UNITS MHzp-p MHz/V
MAX2754
Specifications production tested +25°C. Limits over temperature guaranteed design characterization. Limits guaranteed production test +25°C. Center point nominally +1.4V. Maximum variation modulation sensitivity from average value over guaranteed frequency limits. Bandwidth defined point where response modulation port 0.707 times low-frequency response. Bandwidth limits modulation input 1Vp-p sine wave. Common-mode VMOD +1.4V. Note Refer Output Buffer section suggestions improve return loss 12dB. Note Turn-on time within final output power. Note Turn-off time output power -10dBm. Note Note Note Note Note
1.2GHz with Linear Modulation Input MAX2754
Typical Operating Characteristics
(MAX2754 kit, +3.0V, SHDN +2.0V, VTUNE VMOD +1.4V, +25°C, unless otherwise noted.)
TUNING CURVE
MAX2754 toc01
1350 1300 1250 FREQUENCY (MHz) 1200 1150 1100 1050 1000 VTUNE +85°C +25°C -40°C
MODULATION SENSITIVITY CARRIER FREQUENCY
MAX2754 toc02
TUNE INPUT CURRENT TEMPERATURE
MAX2754 toc03
-400 -420 MODULATION SENSITIVITY (kHz/V) -440 -460 -480 -500 -520 -540 -560 -580 +85°C 1140 1160 1180 1200 +25°C -40°C
TUNING INPUT CURRENT (nA)
-600 1220 1240 1260 CARRIER FREQUENCY (MHz)
TEMPERATURE (°C)
OUTPUT POWER FREQUENCY
MAX2754 toc04
-3.0 -3.5 OUTPUT POWER (dBm) -4.0 -4.5 +4.0V -5.0 -5.5 -6.0 1140 1160 1180 1200 1220 1240 +2.7V +5.5V
OUTPUT POWER FREQUENCY
MAX2754 toc05
NORMALIZED HARMONIC OUTPUT SPECTRUM
MAX2754 toc06
OUTPUT POWER (dBm) +25°C -40°C +85°C
-20dBc OUTPUT POWER (dBm) -30dBc
1260
1140 1160 1180 1200 1220 1240 1260 FREQUENCY FREQUENCY (MHz)
FREQUENCY (MHz)
PHASE NOISE
MAX2754 toc07
OSCILLATOR TURN-ON/ TURN-OFF TIME
MAX2754 toc08
OUTPUT
MAX2754 toc09
PHASE NOISE (dBc/Hz) -100 -110 -120 -130 -140 -150 -160 1000
OUTPUT POWER (dBm) -100 SHDN HIGH-TO-LOW TIME SHDN LOW-TO-HIGH TIME
(dB)
1000 1100 1200 1300 1400 1500 1600 FREQUENCY (MHz) TIME (µs)
10,000
OFFSET FREQUENCY (kHz)
1.2GHz with Linear Modulation Input
Description
NAME VREG TUNE GND1 SHDN GND2 FUNCTION Capacitor Connection On-Chip Linear Regulator Output. Connect 330nF capacitor ground. Oscillator Frequency Tuning-Voltage Input. High-impedance input with voltage range +0.4V (low frequency) +2.4V (high frequency). Ground Connection Oscillator Core. Requires low-inductance connection circuitboard ground plane. Linear Modulation Input. High-impedance CMOS input with voltage range +0.4V +2.4V. Shutdown Input. Drive logic place device shutdown mode. Drive logic high normal operation. Ground Connection Output-Buffered Amplifier, Linear Modulation Interface, Biasing. Requires low-inductance connection circuit-board ground plane. Buffered Oscillator Output. Incorporates internal DC-blocking capacitor. internally matched Supply Voltage Connection. Requires external bypass capacitor ground noise spurious content performance from oscillator. Bypass with 330pF capacitor ground.
MAX2754
Detailed Description
Oscillator
MAX2754 implemented oscillator topology, integrating tank components onchip. This fully monolithic approach provides extremely easy-to-use VCO, equivalent module. frequency controlled voltage applied TUNE pin. core uses differential topology provide stable frequency versus supply voltage improve immunity load variations. addition, there buffer amplifier following oscillator core provide added isolation from load supply variations boost output power.
tion frequency. This convention modulation gain practical implementation internal linearizing circuitry. This gain inversion must considered when designing analog voltage interface that drives linear modulation input. easiest handle this invert logic polarity modulation data three-state output buffer data output). Where impossible invert data-stream logic polarity, external inverter three-state buffer would required. These devices offered small single-logic gates SC-79 style packages from various manufacturers (e.g., Fairchild-Tiny Logic, Semiconductor, Rohm). Figure illustrates frequency versus VMOD characteristic modulation input. Note negative slope curve, dfMOD/dVMOD where fMOD fOUT fNOM.
Linear Modulation
linear modulation input offers means directly modulate with controlled amount frequency deviation given input voltage deviation. unique technique maintains consistent modulation gain (df/dVMOD) across entire frequency tuning range part, enabling accurate modulation derived solely from filtered "data" stream (the modulation voltage input). modulation input single-ended centered about +1.4V. linear modulation full-scale range around this point, +0.4V +2.4V input voltage range. very important point note that sign modulation gain negative. positive change VMOD results negative change oscilla-
Output Buffer
oscillator signal from core drives output buffer amplifier. amplifier internally matched including on-chip DC-blocking capacitor. return loss improved minimum 12dB over 1145MHz 1250MHz adding 2.5nH series inductor 3.0pF shunt capacitor. output buffer ground connection separate from oscillator core minimize load-pulling effects. amplifier boosts oscillator signal level suitable driving most mixers.
1.2GHz with Linear Modulation Input MAX2754
Applications Information
Tune Input
tuning input typically connected output loop filter. loop filter provides appropriately low-impedance source. Incorporate extra filter stage reduce high-frequency noise spurious signals. excess noise tuning input directly translated into noise, which degrade phase-noise performance oscillator. Therefore, important minimize noise introduced tuning input. simple filter with corner frequency needed during testing filter noise present voltage source driving tuning line.
fNOM fMOD OUTPUT FREQUENCY (MHz)
fNOM
fNOM fMOD
Two-Level Applications
MAX2754 designed applications operating 2.4GHz 2.5GHz band. Specifically, targeted those systems which utilize direct modulation architecture which directly modulated with data signal during transmit (TX) mode. these systems runs half output frequency used conjunction with frequency doubler produce final signal both modes operation.
MODULATION VOLTAGE, VMOD
Figure Modulation Frequency Deviations Characteristics
Figure shows typical applications circuit. compute determine modulation voltage center point (VMODB +1.4V). Compute required modulation voltage deviation follows:
VREG 330nF BIAS 330nF
INVERTED CMOS SIGNAL
FROM LOOP FILTER
TUNE
OSCILLATOR CORE
MIXER/ SYNTHESIZER
GND1 MOD. FILTER LINEAR MODULATION INTERFACE MAX2754
GND2
SHDN
FROM BASEBAND DIGITAL CONTROLLER
Figure Typical Application Circuit Two-Level
1.2GHz with Linear Modulation Input
500kHz/V (nominal modulation sensitivity) Setting based desired current from filter impedance level: MODB MODB VMODB
Layout Issues
controlled impedance lines (microstrip, co-planar waveguide, etc.) each time high-frequency signals. Always place decoupling capacitors close pins possible; long lines, necessary additional decoupling capacitors located further from device. Always provide low-inductance path ground, keep vias close device possible. Thermal reliefs pads recommended.
MAX2754
Chip Information
TRANSISTOR COUNT:
1.2GHz with Linear Modulation Input MAX2754
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
8LUMAXD.EPS
INCHES 0.002 0.030 0.043 0.006 0.037
MILLIMETERS 0.05 0.75 1.10 0.15 0.95
0.50±0.1
0.6±0.1
0.6±0.1
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 0.120 0.116 0.198 0.188 0.026 0.016 0.0207
0.25 0.36 0.13 0.18 2.95 3.05 0.65 2.95 3.05 4.78 5.03 0.41 0.66 0.5250
VIEW
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, uMAX/uSOP
APPROVAL DOCUMENT CONTROL REV.
21-0036
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 2003 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

ATION EVALU ILABLE 1.2GHz with Linear Modulation Input Fully

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