MAX2247EBC-T ,2.4GHz SiGe Linear Power AmplifierApplicationsIEEE 802.11b DSSS WLANB1 B3 B4IEEE 802.11g OFDM WLANPD_GND3 GND1MAX2247 OUTHomeRF™2.4GH ..
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MAX2247EBC-T
2.4GHz SiGe Linear Power Amplifier
General DescriptionThe MAX2247 low-voltage, three-stage linear power
amplifier (PA) is optimized for 802.11b/g wireless LAN
(WLAN) applications in the 2.4GHz ISM band. The
device is integrated with an adjustable bias control,
power detector, and shutdown mode. The MAX2247
features 29dB of power gain and delivers up to
+24dBm of linear output power at 24% efficiency from a
single +3.3V supply. It achieves less than -32dBc first-
side lobe suppression and less than -55dBc second-
side lobe suppression under 802.11b modulation. In
addition, the device can be matched for optimum effi-
ciency and performance at output power levels from
+10dBm to +24dBm. Its high +28dBm saturated output
power also allows the device to meet the requirements
of 802.11g OFDM modulation.
The MAX2247 features an external bias-control pin that
allows the supply current of the device to be dynamical-
ly throttled back at lower output power levels, thus
improving efficiency while maintaining sufficient side-
lobe suppression. Proprietary internal bias circuitry
maintains stable device performance over temperature
and voltage-supply variations. An additional power-sav-
ing feature is a logic-level shutdown pin that reduces
supply current to 0.5µA and eliminates the need for an
external supply switch. The integrated shutdown func-
tion also allows guaranteed device ramp-on and ramp-
off times.
The MAX2247 integrates a power detector with 20dB
dynamic range and ±0.8dB accuracy at the highest
output power level. The detector provides a buffered
DC voltage proportional to the output power of the
device, saving cost and space by eliminating a coupler
and op amp usually required to implement a power
detector function. The device is packaged in the tiny
3 ✕4 chip-scale package (UCSP™), measuring only
1.5mm ✕2mm, making it the ideal solution for radios built
in small form factors.
ApplicationsIEEE 802.11b DSSS WLAN
IEEE 802.11g OFDM WLAN
HomeRF™
2.4GHz Cordless Phones
2.4GHz ISM Radios
Features2.4GHz to 2.5GHz Operating RangeUp to +24dBm Linear Output Power (ACPR of
Less than -32dBc First-Side Lobe and Less than
-55dBc Second-Side Lobe)24% PAE at +24dBm Linear Output Power, 3.3V
24% PAE at +21dBm Linear Output Power, 3.0V29dB Power GainOn-Chip Power Detector with Buffered OutputInternal 50ΩInput Matching External Bias Control for Current ThrottlebackIntegrated Bias Circuitry+2.7V to +4.2V Single-Supply Operation0.5µA Shutdown ModeTiny Chip-Scale Package (1.5mm ✕2mm)
MAX2247
2.4GHz SiGe Linear Power Amplifier
Ordering Information19-2520; Rev 4; 8/03
Typical Operating Circuit appears at end of data sheet.
Pin Configuration*Requires special solder temperature profile in the Absolute
Maximum Ratings Sections.
UCSP is a trademark of Maxim Integrated Products, Inc.
HomeRF is a trademark of HomeRF Working Group.
MAX2247
2.4GHz SiGe Linear Power Amplifier
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(MAX2247 EV kit, VCC_= +2.7V to +4.2V, SHDN= VCC, RF_IN and RF_OUT terminated to 50Ω, TA= -40°C to +85°C. Typical values
are at +3V and TA= +25°C, unless otherwise noted.) (Note 2)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCC1, VCC2, VCCB, RF_OUT to GND....................-0.3V to +4.5V
SHDN, BIAS, PD_OUT................................-0.3V to VCC_+ 0.3V
RF Input Power (50Ωsource)...........................................+5dBm
RF_IN Input Current............................................................±1mA
Maximum VSWR Without Damage........................................10:1
Maximum VSWR for Stable Operation, POUT< +25dBm........5:1
Continuous Power Dissipation (TA= +70°C)
3 ✕4 UCSP (derate 28.5mW/°C above +70°C)..............1.3W
Thermal Resistance.........................................................35°C/W
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +125°C
Bump Temperature (soldering) (Note 1)
Infrared (15s)...............................................................+220°C
Vapor Phase (60s).......................................................+215°C
Continuous Operating Lifetime.....................10yrs ×0.92(TA- 60°C)
(For Operating Temperature, TA≥+60°C)
MAX2247
2.4GHz SiGe Linear Power Amplifier
Note 1:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits the use of only the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not recommended.
Note 2:Characteristics are production tested at TA= +25°C. DC specifications over temperature are guaranteed by design
and characterization.
Note 3:Idle current is controlled by external DAC for best efficiency over the entire output power range.
Note 4:Parameter is measured with RF modulation based on IEEE 802.11b standard.
Note 5:Minimum and maximum specifications are guaranteed by design and characterization.
Note 6:Operation outside this range is possible but not guaranteed.
Note 7:The total turn-on time required for PA output power to settle to within 0.5dB of the final value.
Note 8:Specification is corrected for PC board loss of approximately 0.3dB, on the output of the MAX2247 EV kit.
Note 9:Total turn-off time required for PA supply current to fall below 10µA.
Note 10:See the Typical Operating Characteristicsfor statistical variation.
AC ELECTRICAL CHARACTERISTICS(MAX2247 EV kit, VCC_= +3V, fRF= 2.45GHz, SHDN= VCC, 50ΩRF system impedance, TA= +25°C, unless otherwise noted.) (Note 5)
MAX2247
2.4GHz SiGe Linear Power Amplifier
Typical Operating Characteristics(VCC_= 3V, fRF= 2.45GHz, with MAX2247 EV kit optimized for POUT= +23dBm. TA= +25°C, unless otherwise noted.)
MAX2247
2.4GHz SiGe Linear Power Amplifierypical Operating Characteristics (continued)(VCC_= 3V, fRF= 2.45GHz, with MAX2247 EV kit optimized for POUT= +23dBm. TA= +25°C, unless otherwise noted.)
MAX2247
2.4GHz SiGe Linear Power Amplifier
Pin Description
Functional Diagram/Typical Operating Circuit
