2.4GHz SiGe Linear Power Amplifier MAX2247 low-voltage, three-sta
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2.4GHz SiGe Linear Power Amplifier
MAX2247 low-voltage, three-stage linear power amplifier (PA) optimized 802.11b/g wireless (WLAN) applications 2.4GHz band. device integrated with adjustable bias control, power detector, shutdown mode. MAX2247 features 29dB power gain delivers +24dBm linear output power efficiency from single +3.3V supply. achieves less than -32dBc firstside lobe suppression less than -55dBc secondside lobe suppression under 802.11b modulation. addition, device matched optimum efficiency performance output power levels from +10dBm +24dBm. high +28dBm saturated output power also allows device meet requirements 802.11g OFDM modulation. MAX2247 features external bias-control that allows supply current device dynamically throttled back lower output power levels, thus improving efficiency while maintaining sufficient sidelobe suppression. Proprietary internal bias circuitry maintains stable device performance over temperature voltage-supply variations. additional power-saving feature logic-level shutdown that reduces supply current 0.5µA eliminates need external supply switch. integrated shutdown function also allows guaranteed device ramp-on rampoff times. MAX2247 integrates power detector with 20dB dynamic range ±0.8dB accuracy highest output power level. detector provides buffered voltage proportional output power device, saving cost space eliminating coupler usually required implement power detector function. device packaged tiny chip-scale package (UCSPTM), measuring only 1.5mm 2mm, making ideal solution radios built small form factors. 2.4GHz 2.5GHz Operating Range +24dBm Linear Output Power (ACPR Less than -32dBc First-Side Lobe Less than -55dBc Second-Side Lobe) +24dBm Linear Output Power, 3.3V +21dBm Linear Output Power, 3.0V 29dB Power Gain On-Chip Power Detector with Buffered Output Internal Input Matching External Bias Control Current Throttleback Integrated Bias Circuitry +2.7V +4.2V Single-Supply Operation 0.5µA Shutdown Mode Tiny Chip-Scale Package (1.5mm 2mm)
Features
MAX2247
Ordering Information
PART MAX2247EBC-T MAX2247EWC+T TEMP RANGE -40°C +85°C -40°C +85°C PINPACKAGE UCSP* MARK +AAX
*Requires special solder temperature profile Absolute Maximum Ratings Sections. -Denotes package containing lead(Pb). +Denotes lead(pB)-free/RoHS-compliant package. Tape reel.
Typical Operating Circuit appears data sheet.
Configuration
VIEW
BIAS
VCC2
GND2
VCC1
Applications
IEEE 802.11b DSSS WLAN IEEE 802.11g OFDM WLAN HomeRF2.4GHz Cordless Phones 2.4GHz Radios
UCSP trademark Maxim Integrated Products, Inc. HomeRF trademark HomeRF Working Group.
SHDN VCCB RF_IN GND3 GND1
MAX2247
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim Direct 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
2.4GHz SiGe Linear Power Amplifier MAX2247
ABSOLUTE MAXIMUM RATINGS
VCC1, VCC2, VCCB, RF_OUT GND.-0.3V +4.5V SHDN, BIAS, PD_OUT .-0.3V VCC_ 0.3V Input Power source).+5dBm RF_IN Input Current.±1mA Maximum VSWR Without Damage .10:1 Maximum VSWR Stable Operation, POUT +25dBm.5:1 Continuous Power Dissipation +70°C) UCSP, (derate 28.5mW/°C above +70°C) .1.3W Thermal Resistance (Note 1).35°C/W Operating Temperature Range .-40°C +85°C Junction Temperature .+150°C Storage Temperature Range .-65°C +125°C UCSP Bump Temperature (soldering) (Note Infrared (15s) .+220°C Vapor Phase (60s) .+215°C Bump Soldering Temperature .+250°C Continuous Operating Lifetime.10yrs 0.92(TA 60°C) (For Operating Temperature, +60°C)
Note Package thermal resistances were obtained using method described JEDEC specification JESD51-7, using fourlayer board. detailed information package thermal considerations, refer Note This device constructed using unique packaging techniques that impose limit thermal profile device exposed during board-level solder attach rework. This limit permits only solder profiles recommended industry-standard specification, JEDEC 020A, paragraph 7.6, Table IR/VPR convection reflow. Preheating required. Hand wave soldering recommended.
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
(MAX2247 kit, VCC_ +2.7V +4.2V, SHDN VCC, RF_IN RF_OUT terminated -40°C +85°C. Typical values +25°C, unless otherwise noted.) (Note
PARAMETER Supply Voltage Idle current 250mA with 3.3V POUT +24dBm, VCC_ 3.3V POUT +25dBm, VCC_ 4.2V POUT +23dBm, VCC_ 3.0V CONDITIONS UNITS
Supply Current (Notes
POUT +21dBm with optimized output-matching circuit. Refer MAX2247 details. POUT +18dBm with optimized output-matching circuit. Refer MAX2247 details. POUT +15dBm with optimized output-matching circuit. Refer MAX2247 details.
Shutdown Supply Current Digital Input Logic High Digital Input Logic Digital Input Current High Digital Input Current
SHDN signal applied
2.4GHz SiGe Linear Power Amplifier
ELECTRICAL CHARACTERISTICS
(MAX2247 kit, VCC_ +3V, 2.45GHz, SHDN VCC, system impedance, +25°C, unless otherwise noted.) (Note
PARAMETER Frequency Range (Notes VCC_ POUT +23dBm Power Gain (Notes VCC_ 3.3V, POUT +24dBm VCC_ 4.2V, POUT +25dBm Gain Variation Over Supply Voltage (Note Output Power Over Temperature (Notes Saturated Output Power Harmonic Output (2f, Input VSWR Output VSWR Power Ramp Turn-On Time (Note Power Ramp Turn-Off Time (Note Output Detector Response Time Output Detector Voltage (Note POUT +23dBm POUT +15dBm POUT +7dBm Over full range Over full POUT range 3.0V 3.6V ACPR: First-side lobe -32dBc, second-side lobe -55dBc +5dBm VCC_ VCC_ 3.3V VCC_ 4.2V +25°C -40°C +85°C 29.5 30.5 ±0.5 27.8 1.8:1 0.47 2.5:1 2.5:1 CONDITIONS 29.5 UNITS
MAX2247
Note Characteristics production tested +25°C. specifications over temperature guaranteed design characterization. Note Idle current controlled external best efficiency over entire output power range. Note Parameter measured with modulation based IEEE 802.11b standard. Note Minimum maximum specifications guaranteed design characterization. Note Operation outside this range possible guaranteed. Note total turn-on time required output power settle within 0.5dB final value. Note Specification corrected board loss approximately 0.3dB, output MAX2247 kit. Note Total turn-off time required supply current fall below 10µA. Note Typical Operating Characteristics statistical variation.
2.4GHz SiGe Linear Power Amplifier MAX2247
Typical Operating Characteristics
(VCC_ 2.45GHz, with MAX2247 optimized POUT +23dBm. +25°C, unless otherwise noted.)
OUTPUT POWER, SUPPLY CURRENT SUPPLY VOLTAGE
POUT (dBm) -40°C POUT +25°C +85°C
MAX2247 toc01
OUTPUT POWER, SUPPLY CURRENT SUPPLY VOLTAGE
SUPPLY CURRENT (mA) POUT (dBm) SUPPLY VOLTAGE -40°C POUT +25°C +85°C INPUT POWER ADJUSTED KEEP ADJ/ALT -32dBc/-55dBc
MAX2247 toc02
GAIN SUPPLY VOLTAGE
SUPPLY CURRENT (mA) GAIN (dB) SUPPLY VOLTAGE +85°C +25°C POUT +23dBm -40°C
MAX2247 toc03
INPUT POWER ADJUSTED KEEP ADJ/ALT -30dBc/-50dBc
SUPPLY VOLTAGE
SUPPLY CURRENT SUPPLY VOLTAGE
MAX2247 toc04
SUPPLY VOLTAGE
MAX2247 toc05
SUPPLY VOLTAGE
(dBc) +25°C +85°C POUT +23dBm
MAX2247 toc06
SUPPLY CURRENT (mA)
POUT +23dBm +85°C
(dBc)
POUT +23dBm
+25°C
+25°C
+85°C
-40°C
-40°C
-40°C
SUPPLY VOLTAGE
SUPPLY VOLTAGE
SUPPLY VOLTAGE
OUTPUT POWER INPUT POWER
MAX2247 toc07
SUPPLY CURRENT OUTPUT POWER
BIAS CURRENT ADJUSTED KEEP ADJ/ALT -32dBc/-55dBc
MAX2247 toc08
ADJ/ALT OUTPUT POWER
ADJ/ALT (dBc)
MAX2247 toc09
POUT (dBm) (dBm) +3.0V +3.3V +4.2V
SUPPLY CURRENT (mA) POUT (dBm)
POUT (dBm)
2.4GHz SiGe Linear Power Amplifier
Typical Operating Characteristics (continued)
(VCC_ 2.45GHz, with MAX2247 optimized POUT +23dBm. +25°C, unless otherwise noted.)
MAX2247
FREQUENCY
MAX2247 toc10
FREQUENCY
POUT +23dBm
MAX2247 toc11
SUPPLY CURRENT FREQUENCY
POUT +23dBm SUPPLY CURRENT (mA) +25°C -40°C +85°C
MAX2247 toc12
(dBc)
POUT +23dBm +85°C +25°C
(dBc) +25°C
+85°C
-40°C
-40°C
2400 2420 2440 2460 2480 2500 2400 2420 2440 2460 2480 2500 FREQUENCY (MHz) FREQUENCY (MHz)
2400
2420
2440
2460
2480
2500
FREQUENCY (MHz)
GAIN FREQUENCY
MAX2247 toc13
INPUT/OUTPUT RETURN LOSS FREQUENCY
MAX2247 toc14
POWER DETECTOR VOLTAGE OUTPUT POWER
POWER DETECTOR VOLTAGE +4.2V, -40°C +2.7V, +85°C
MAX2247 toc15
POUT +23dBm -40°C GAIN (dB)
RETURN LOSS (dB) INPUT RETURN LOSS OUTPUT RETURN LOSS
+25°C +85°C
2400 2420 2440 2460 2480 2500 FREQUENCY (MHz)
2400
2420
2440
2460
2480
2500
FREQUENCY (MHz)
POUT (dBm)
OUTPUT POWER HISTOGRAM FIXED POWER DETECTOR VOLTAGE
MAX2247 toc16
OUTPUT POWER HISTOGRAM FIXED 0.6V POWER DETECTOR VOLTAGE
MAX2247 toc17
OUTPUT POWER HISTOGRAM FIXED 0.47V POWER DETECTOR VOLTAGE
SIGMA 0.38dBm BASED PARTS OCCURRENCES
MAX2247 toc18
OCCURRENCES
SIGMA 0.25dBm BASED PARTS
SIGMA 0.237dBm BASED PARTS OCCURRENCES
22.625 22.875 23.125 23.375 14.408 14.645 14.882 15.119 15.356 15.593 OUTPUT POWER (dBm) OUTPUT POWER (dBm) 6.05 6.43 6.81 7.19 7.57 7.95 OUTPUT POWER (dBm)
2.4GHz SiGe Linear Power Amplifier MAX2247
Description
BUMP NAME BIAS VCC2 GND2 VCC1 GND3 PD_OUT GND1 RF_OUT SHDN VCCB RF_IN DESCRIPTION Bias Control. overall current current sourced through bias pin. Bias Circuitry section. Second-Stage Supply Voltage. Sets bias external matching second amplifier stage. Requires small inductance. Bypass ground using configuration Typical Operating Circuit. Second-Stage Ground. Applications Information section detailed layout information. First-Stage Supply Voltage. Sets bias external matching first amplifier stage. Requires small inductance. Bypass ground using configuration Typical Operating Circuit. Third-Stage Ground. Applications Information section detailed layout information. Power-Detector Output. This output voltage indicating output power. First-Stage Bias-Control Circuit Ground Output. Open-collector output. Requires pullup inductor, which part matching network. Shutdown Input. Drive logic place device shutdown mode. Drive logic high normal operation. Bias Circuit Supply Voltage. Bypass ground using configuration Typical Operating Circuit. Input. Internally matched Requires external DC-blocking cap.
Functional Diagram/Typical Operating Circuit
10nF POWER-DETECTOR OUTPUT
SHUTDOWN CONTROL
TRANSMISSION LINE SHDN VCC2 PD_OUT 22pF BIAS CIRCUIT DETECTOR 10nF
BIAS
MAX2247
10nF
VCCB 3.9nH VCC1
10nF RF_IN
RF_OUT INPUT MATCH C33*
22pF OUTPUT
INPUT 22pF
GND1
GND2
GND3
*NOT REQUIRED OUTPUT POWER LESS THAN +23dBm.
REFER MAX2247 LAYOUT DESIGN DETAILS.
2.4GHz SiGe Linear Power Amplifier
Detailed Description
MAX2247 linear power amplifier (PA) offers wide variety features incorporated into tiny UCSP package. device includes internal bias circuitry, integrated power detector with buffered output, low-power shutdown mode, internal input matching. MAX2247 output power optimized +15dBm +24dBm adjusting output, first-stage, secondstage matching network (see Typical Operating Circuit) while exceeding 802.11b ACPR requirements. addition, external bias control allows dynamic throttleback supply current increase efficiency. MAX2247's performance optimized lower output power levels. Maxim website, www.maxim-ic.com, MAX2247 application notes covering performance +21dBm, +18dbm, +15dBm. overall current MAX2247 current sourced through bias pin. overall current times bias current. internal bandgap reference provides +1.2V each bias stage (see Figure external resistor ground placed bias bias current (refer MAX2247 evaluation kit). external current connected directly bias adjust bias current MAX2247. Figure shows MAX2247 connected MAX2820 zero-IF transceiver, which includes 4-bit DAC.
MAX2247
Shutdown Mode
MAX2247 features low-power shutdown mode further reduce current consumption. MAX2247 responds logic-level signals SHDN pin. logic-level high enables circuitry, while logic-level places device low-power shutdown mode reduces supply current 0.5µA (typ). Power-ramp turn-on turn-off times guaranteed less than 1.5µs.
Bias Circuitry
improve efficiency lower output levels, bias offered allow dynamic current control. external current resistor network used throttleback current lower output powers while still maintaining ACPR requirements. including internal voltage regulator along with bias circuitry, external bias voltage necessary. internal voltage regulator maintains stable performance bias circuitry over temperature supply variations.
Power Detector
This device includes power detector that samples peak voltage output generates voltage proportional output power. detector fully temperature compensated allows user detector bandwidth with external capacitor.
INTERNAL VOLTAGE REFERENCE
1ST-STAGE AMPLIFIER BIAS CURRENT
2ND-STAGE AMPLIFIER BIAS CURRENT
3RD-STAGE AMPLIFIER BIAS CURRENT
1.2V INPUT
1.2V
1.2V RF_OUT OUTPUT
MAX2247
BIAS CONNECTED EXTERNAL RESISTOR/DAC SETTING BIAS CURRENT
Figure Internal Bias Circuitry
2.4GHz SiGe Linear Power Amplifier MAX2247
STANDARD BASEBAND/MAC POWER DETECTOR
MAX2820
BASEBAND ZERO-IF TRANSCEIVER
POWER DETECTOR
BIAS CIRCUIT
CURRENT BASEBAND
MAX2247
BALUN
OUTPUT
DRIVER
SHUTDOWN CONTROL
Figure MAX2247 Connected Current MAX2820 Bias Control
Applications Information
MAX2247 three-stage amplifier that requires special attention board layout grounding optimum output power, gain, efficiency, side-lobe suppression. ease implementation, MAX2247 evaluation (EV) layout should used model. Gerber files available from Maxim upon request. Follow recommendations below optimize performance when adapting layout your board.
addition bypass capacitors each bias line, global bypass capacitor 4.7µF necessary filter noise supply line. Route separate bias paths from global bypass capacitor (using star topology) avoid coupling between stages. MAX2247 board layout guide.
Input Matching
MAX2247 includes internal input matching external matching network required. DC-blocking capacitor required input device.
Interstage Matching Bypassing
VCC1 VCC2 provide bias open-collector outputs first- second-stage amplifiers also part interstage matching networks required optimize performance among three amplifier stages. MAX2247 must have small amount inductance lines addition inductance already provided on-chip. Typical Application Circuit lumped discrete component values used MAX2247 optimum interstage matching bypassing.
Output Matching
RF_OUT port open-collector output that must pulled through choke proper biasing (see Typical Operating Circuit). shunt 22pF capacitor ground required supply side inductor. addition, matching network required optimum gain, efficiency, ACPR, output power. should serve good starting point your layout. However, optimum performance layout dependent, some component optimization required. important leave room your board tuning/optimization.
2.4GHz SiGe Linear Power Amplifier
Ground Vias
achieve optimum gain, output power, thermal performance, ACPR performance, ground vias should properly placed throughout layout. Each ground requires through-hole (diameter 10mils) placed near possible device pin. This reduces ground inductance, thermal resistance, feedback between stages. MAX2247 board layout guide. integrity must considered because package attached through direct solder contact user's board. Testing done characterize UCSP reliability performance shows that capable performing reliably through environmental stresses. Users should also aware that with interconnect system there electromigration-based current limits that, this case, apply maximum allowable current bumps. Reliability function this current, duty cycle, lifetime, bump temperature. Absolute Maximum Ratings section specific limitations listed under Continuous Operating Lifetime. Results environmental stress tests additional usage data recommendations detailed UCSP application note, which found Maxim's website
MAX2247
UCSP Reliability
tiny chip-scale package (UCSP) represents unique package that greatly reduces board space compared other packages. UCSP reliability integrally linked user's assembly methods, circuit board material, usage environment. Operating life test moisture resistance remains uncompromised, primarily determined wafer-fabrication process. Mechanical stress performance greater consideration UCSP. UCSP solder-joint contact
Chip Information
TRANSISTOR COUNT: 1425
Package Information
latest package outline information, www.maxim-ic.com/packages. PACKAGE TYPE UCSP PACKAGE CODE B12-8 W121B2+2 DOCUMENT 21-0104 21-0009
2.4GHz SiGe Linear Power Amplifier MAX2247
Revision History
REVISION NUMBER REVISION DATE 8/03 1/09 Added MAX2247EWC+T Ordering Information, added package information PAGES CHANGED
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 2009 Maxim Integrated Products Maxim registered trademark Maxim Integrated Products, Inc.
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