5GHz Linear Power Amplifiers 5GHz 6GHz Operating Frequency Range
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19-2494; 8/03
5GHz Linear Power Amplifiers
5GHz 6GHz Operating Frequency Range High Linear Output Power +15dBm 5.25GHz (MAX2840) +18dBm 5.25GHz (MAX2841) 22dB Power Gain On-Chip Detector With 15dB Dynamic Range ±1.0dB Detector Accuracy Simple Input Output Matching +2.7V +3.6V Single Supply Shutdown Mode With Less than 10µA Current 1.5mm Chip-Scale Package
MAX2840/MAX2841
MAX2840/MAX2841 low-cost linear power amplifiers (PAs) operate 5GHz 6GHz band. designed high gain high linearity, which makes them ideal IEEE 802.11a OFDM systems. MAX2840 delivers +15dBm output power, MAX2841 delivers +18dBm output power. devices integrate power detector that provides over 15dB dynamic range ±1.0dB accuracy. With detector circuit built automatic level control (ALC) function easily implemented. also feature external bias control function. idle current adjusted through external improve efficiency reduced output powers while maintaining sufficient ACPR performance. result, highest possible efficiency maintained power levels. MAX2840/MAX2841 operate over single +2.7V +3.6V power-supply range. on-chip shutdown feature reduces operating current less than 10µA, eliminating need external supply switch. MAX2840/MAX2841 packaged 1.5mm chip-scale package (UCSPTM), which significantly minimizes parasitic effects reduces required board area.
Ordering Information
PART MAX2840EBC-T MAX2841EBC-T TEMP RANGE -40°C +85°C -40°C +85°C PINPACKAGE UCSP UCSP MARK
Typical Operating Circuit appears data sheet.
Applications
IEEE 802.11a OFDM WLAN HiperLAN2 WLAN 5GHz Cordless Phones
SHDN BIAS CIRCUIT BIAS
Configuration
Functional Diagram
SHDN P_DET
BIAS BIAS CIRCUIT DETECTOR
RF_IN
MAX2840 MAX2841
MAX2840 MAX2841
P_DET
RF_IN
RF_OUT
RF_OUT
UCSP trademark Maxim Integrated Products, Inc. Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
5GHz Linear Power Amplifiers MAX2840/MAX2841
ABSOLUTE MAXIMUM RATINGS
.-0.3V +4.2V SHDN, BIAS, P_DET, RF_OUT .-0.3V (VCC 0.3V) RF_IN GND.-0.3V +0.9V Input Power +10dBm VSWR Without Damage .10:1 VSWR Stable Operation .5:1 Continuous Operating Lifetime.10yrs 0.93(TA 60°C) (for operating temperature 60°C 85°C) Continuous Power Dissipation +85°C) UCSP (derate 80mW/°C above +85°C) 1.6W Operating Temperature Range .-40°C +85°C Thermal Resistance .25°C/W Junction Temperature .+150°C Storage Temperature Range .-65°C +125°C Soldering Temperature (10s) .+260°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 +3.6V, SHDN VCC, VDAC 1.6V (MAX2840), VDAC 1.9V (MAX2841), -40°C +85°C. Typical values measured +3.3V, 5.25GHz, +25°C, unless otherwise noted.) (Note
PARAMETER Supply Voltage POUT 15dBm, 3.3V, MAX2840 (Notes POUT 18dBm, 3.3V, MAX2841 (Notes Supply Current signal, input output terminated with SHDN signal Digital Input Voltage High Digital Input Voltage Digital Input Current High Digital Input Current MAX2840 MAX2841 CONDITIONS UNITS
ELECTRICAL CHARACTERISTICS
(MAX2840/MAX2841 kits, +2.7V +3.6V, SHDN VCC, VDAC 1.6V (MAX2840), VDAC 1.9V (MAX2841), +25°C. Typical values measured +3.3V, 5.25GHz, unless otherwise noted.) (Note
PARAMETER Frequency Range Power Gain (Note Power Gain (Note POUT 15dBm (MAX2840) POUT 18dBm (MAX2841) +85°C, 3.3V (Note ACPR: -23dBc 11MHz offset, -31dBc 20MHz offset, -43dBc 30MHz offset over 100kHz OFDM, 64-QAM signal (Notes POUT 15dBm (MAX2840) POUT 18dBm (MAX2841) POUT 15dBm (MAX2840) POUT 18dBm (MAX2841) MAX2840 MAX2841 19.5 %RMS CONDITIONS 5.15 22.8 22.5 5.35 UNITS
Output Power
Error Vector Magnitude (Note Harmonic Output (2f,
5GHz Linear Power Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(MAX2840/MAX2841 kits, +2.7V +3.6V, SHDN VCC, VDAC 1.6V (MAX2840), VDAC 1.9V (MAX2841), +25°C. Typical values measured +3.3V, 5.25GHz, unless otherwise noted.) (Note
PARAMETER Input VSWR Output VSWR Nonharmonic Spurious Output Power Ramp Turn-On Time Power Ramp Turn-Off Time Output Detector Response Time SHDN from high (Note SHDN from high (Note External capacitor, 10pF POUT 15dBm (MAX2840) POUT 18dBm (MAX2841) Output Detector Voltage Range Load >100k (Note POUT 12dBm (MAX2840) POUT 15dBm (MAX2841) POUT 5dBm (MAX2840) POUT 5dBm (MAX2841) Output Detector Accuracy Output Detector Slope When output detector voltage 1.2V maximum output power dB/V CONDITIONS 1.8:1 1.9:1 UNITS
MAX2840/MAX2841
Note Note Note Note Note Note Note Note
Specifications over temperature range guaranteed design. Production tests performed +85°C. 5.25GHz 64-QAM modulated OFDM signal applied input port. values guaranteed design characterization. Operation outside this frequency range possible guaranteed. Specifications corrected board losses kits (0.3dB input, 0.3dB output). input signal following IEEE 802.11a standards. Specifications corrected board losses kits (0.3dB output). total turn-on/settling time required output power within 0.5dB range final value.
Typical Operating Characteristics
(MAX2840/MAX2841 kits, +2.7V +3.6V, SHDN VCC, VDAC 1.6V (MAX2840), VDAC 1.9V (MAX2841), +25°C. Typical values measured +3.3V, 5.25GHz, unless otherwise noted.) (Note
MAX2840 SUPPLY CURRENT SUPPLY VOLTAGE
-8.9dBm
MAX2840/41 toc01
MAX2840 SHUTDOWN CURRENT SUPPLY VOLTAGE
MAX2840/41 toc02
0.30 0.25 SHUTDOWN CURRENT (µA) 0.20 0.15 +25°C 0.10 0.05 +85°C
SUPPLY CURRENT (mA)
-40°C
SUPPLY VOLTAGE
SUPPLY VOLTAGE
5GHz Linear Power Amplifiers MAX2840/MAX2841
Typical Operating Characteristics (continued)
(MAX2840/MAX2841 kits, +2.7V +3.6V, SHDN VCC, VDAC 1.6V (MAX2840), VDAC 1.9V (MAX2841), +25°C. Typical values measured +3.3V, 5.25GHz, unless otherwise noted.) (Note
MAX2840 SUPPLY CURRENT OUTPUT POWER
MAX2840/41 toc03
MAX2840 POWER-ADDED EFFICIENCY (PAE) OUTPUT POWER
2.7V 3.0V
MAX2840/41 toc04
MAX2840 POWER DETECTOR OUTPUT OUTPUT POWER
MAX2840/41 toc05
SUPPLY CURRENT (mA)
POWER DETECTOR OUTPUT
OUTPUT POWER (dBm)
3.6V
OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
MAX2840 INPUT OUTPUT RETURN LOSS FREQUENCY
MAX2840/41 toc06
MAX2840 GAIN FREQUENCY
MAX2840/41 toc07
MAX2840 ACPR SPECTRUM
+15dBm
MAX2840/41 toc08
INPUT OUTPUT RETURN LOSS (dB)
-8.9dBm GAIN (dB)
5150
5200 5250 FREQUENCY (MHz) 5300 5350 5150 5200 5250 FREQUENCY (MHz) 5300 5350 SPAN: 100MHz CENTER: 5.25GHz
OUTPUT POWER, 10dB/div -4.8dBm
MAX2840 OUTPUT POWER
MAX2840/41 toc09
MAX2840 FREQUENCY
-8.9dBm 3.0V 3.3V
MAX2840/41 toc10
MAX2841 SUPPLY CURRENT SUPPLY VOLTAGE
MAX2840/41 toc011
-8.9dBm
SUPPLY CURRENT (mA)
3.0V 3.3V
OUTPUT POWER (dBm)
5150 5200 5250 FREQUENCY (MHz) 5300 5350
SUPPLY VOLTAGE
5GHz Linear Power Amplifiers MAX2840/MAX2841
Typical Operating Characteristics (continued)
(MAX2840/MAX2841 kits, +2.7V +3.6V, SHDN VCC, VDAC 1.6V (MAX2840), VDAC 1.9V (MAX2841), +25°C. Typical values measured +3.3V, 5.25GHz, unless otherwise noted.) (Note
MAX2841 SHUTDOWN CURRENT SUPPLY VOLTAGE
MAX2840/41 toc12
MAX2841 SUPPLY CURRENT OUTPUT POWER
MAX2840/41 toc13
MAX2841 POWER-ADDED EFFICIENCY (PAE) OUTPUT POWER
2.7V
MAX2840/41 toc14
0.30 0.25 SHUTDOWN CURRENT (µA) 0.20 0.15 +25°C 0.10 0.05 +85°C
SUPPLY CURRENT (mA) +25°C -40°C +85°C
3.6V 3.0V
-40°C
SUPPLY VOLTAGE
OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
MAX2841 POWER DETECTOR OUTPUT OUTPUT POWER
MAX2840/41 toc15
MAX2841 INPUT OUTPUT RETURN LOSS FREQUENCY
MAX2840/41 toc16
MAX2841 GAIN FREQUENCY
-4.8dBm GAIN (dB)
MAX2840/41 toc17
POWER DETECTOR OUTPUT -40°C +25°C +85°C
INPUT OUTPUT RETURN LOSS (dB)
5150
5200 5250 FREQUENCY (MHz) 5300 5350 5150 5200 5250 FREQUENCY (MHz) 5300 5350
OUTPUT POWER (dBm)
MAX2841 ACPR SPECTRUM
MAX2840/41 toc18
MAX2841 OUTPUT POWER
MAX2840/41 toc19
MAX2841 FREQUENCY
-4.8dBm
MAX2840/41 toc20
-4.8dBm
POUT +18dBm OUTPUT POWER, 10dB/div
3.0V
3.0V 3.3V
3.3V
CENTER: 5.25GHz SPAN: 100MHz OUTPUT POWER (dBm)
5150 5200 5250 FREQUENCY (MHz) 5300 5350
5GHz Linear Power Amplifiers MAX2840/MAX2841
Description
NAME SHDN RF_IN RF_OUT BIAS P_DET DESCRIPTION Shutdown Input. Drive logic place shutdown mode; drive logic high normal operation. Ground. Requires good connection circuit board ground plane with multiple vias lowest possible inductance lowest thermal resistance. Supply Voltage. Requires external bypass capacitor ground. Power Amplifier Input. Requires external DC-blocking capacitor. Power Amplifier Output. Requires external DC-blocking capacitor pullup inductor. Bias Control. Connect external resistors block adjust bias current. Power Detector Output. This output voltage indicating output power.
Detailed Description
MAX2840/MAX2841 linear power amplifiers (PAs) intended 5GHz 6GHz band applications. fully characterized 5.15GHz 5.35GHz band. consist driver stages output stage. also feature integrated power detector power shutdown mode.
[Equation IMAX PART 2000 R2); (ICC IMAX value, VDAC [Equation IDAC (VDAC 0.82) [Equation IMID PART (2000 R2); (VDAC floating) [Equation PART IBIAS where: VMAX IMAX IMID VDAC
Dynamic Power Control
MAX2840/MAX2841 designed provide optimum power-added efficiency (PAE) both high- low-power applications. +3.3V supply high-output power level, output power typically +18dBm (MAX2841) with idle current 165mA, +15dBm (MAX2840) with idle current 120mA. low-output power levels, current reduced external improve while maintaining sufficient ACPR performance. This achieved using external resistors connected BIAS bias currents driver output stages. Typical Application Circuit resistor values. Typically, voltage 1.9V gives 260mA bias current MAX2841, voltage 1.6V gives 155mA bias current MAX2840. Increasing voltage decreases idle current. Similarly, decreasing voltage increases idle current. Users desired idle current using only off-chip resistors: shunt resistor (R2) from BIAS ground series resistor (R1) voltage, shown Typical Application Circuit. Resistor values determined follows: [Equation VMAX (ICC VDAC VMAX)
maximum voltage maximum idle current idle current with VDAC floating voltage
IDAC current PART 1000 MAX2840, 1600 MAX2841 used constant idle current desired, Equation determine resistor values given total bias current. Only required. capable sourcing sinking currents, full voltage range (typically from +3V) used. substituting desired values VMAX IMAX into Equations easily calculated. capable sourcing current only, Equation determine value resistor desired maximum current. Equation determine value resistor desired minimum current.
5GHz Linear Power Amplifiers
capable sinking current only, resistors connect directly BIAS pin. Equation determine current required given ICC.
Ground Vias
Placement type ground vias important achieve optimum gain output power ACPR performance. Each ground requires (via diameter mils) placed under device reduce ground inductance feedback between stages. MAX2840/MAX2841 board layouts guide.
MAX2840/MAX2841
Shutdown Mode
Apply logic SHDN (pin MAX2840/ MAX2841 shutdown mode. this mode, gain stages disabled supply current drops less than 10µA. Note that shutdown current lowest when VSHDN
Layout Thermal Management Issues
MAX2840/MAX2841 kits serve layout guide. controlled-impedance lines high-frequency inputs outputs. pins also serve heatsinks. Connect pins directly topside ground. boards where ground plane component side, connect pins ground plane with plated multiple through holes close package. board traces connecting pins also serve heatsinks. Make sure traces sufficiently wide.
Power Detector
power detector generates voltage proportional output power. fully temperature compensated allows user bandwidth with external capacitor. maximum bandwidth, connect 100k resistor from P_DET external capacitors.
Applications Information
Supply Bypassing
provides bias first- second-stage amplifiers. Typical Application Circuit lumped discrete component values used MAX2840/MAX2841 kits optimum bypassing. addition bypass capacitors each bias line, global bypass capacitor 10µF necessary filter noise supply line. Route separate bias paths from global bypass capacitor (star topology) avoid coupling between stages. MAX2840/MAX2841 kits board layout guide.
UCSP Reliability
chip-scale package (UCSP) unique package that greatly reduces board space. UCSP reliability integrally linked user's assembly methods, circuit board material, usage environment. user should closely review these areas when considering using UCSP. This form factor might perform equally packaged product through traditional mechanical reliability tests. Performance through operating life test moisture resistance remains uncompromised, primarily determined wafer- fabrication process. Mechanical stress performance greater consideration UCSP. UCSP solder-joint contact integrity must considered because package attached through direct solder contact user's board. Testing characterize UCSP reliability performance shows that capable performing reliably through environmental stresses. Results environmental stress tests additional usage data recommendations detailed UCSP application note, which found Maxim's website, www.maxim-ic.com. Users should aware that, with interconnect system, there electromigration-based current limits, which this case apply maximum allowable current bumps. Reliability function this current, duty cycle, lifetime, bump temperature. Absolute Maximum Ratings section data sheet specific limitation, listed under "Continuous Operating Lifetime."
External Matching
RFIN port requires matching network. RFIN port impedance 5.25GHz. Typical Application Circuit recommended component values. RFOUT port open-collector output that must pulled through 5.6nH choke proper biasing. shunt capacitors ground required supply side inductor. addition, matching network required optimum gain, efficiency, ACPR, output power. load impedance seen RFOUT port MAX2840/ MAX2841 kits approximately This should serve good starting point layout. However, optimum performance layout dependent some component optimization required. Typical Application Circuit lumped discrete component values used MAX2840/ MAX2841 kits achieve this impedance.
Chip Information
TRANSISTOR COUNT: 1263
5GHz Linear Power Amplifiers MAX2840/MAX2841
Typical Operating Circuit
10pF SHDN
100k P_DET
BIAS
MAX2840 MAX2841 BIAS CIRCUIT DECTECTOR 1000pF 5.6nH
1000pF
10pF
6.8pF RF_IN 1.2pF
RF_OUT (MAX2841) 0.6pF (MAX2840)
MILS, MILS (MAX2840) MILS, MILS (MAX2841) **BOARD MATERIAL: FR4, DIELECTRIC THICKNESS: MILS
5GHz Linear Power Amplifiers
Package Information
(The package drawing(s) this data sheet reflect most current specifications. latest package outline information www.maxim-ic.com/packages.)
12L, UCSP 4x3.EPS
MAX2840/MAX2841
PACKAGE OUTLINE, UCSP 21-0104
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.
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