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MAX2247EBC

更新时间： 2024-10-03 13:10:27
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美信 - MAXIM 半导体放大器功率放大器
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19-2520; Rev 5; 1/09  
2.4GHz SiGe Linear Power Amplifier  
MAX247  
General Description  
Features  
The 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.  
♦ 2.4GHz to 2.5GHz Operating Range  
♦ Up 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, 3.0V  
♦ 29dB Power Gain  
♦ On-Chip Power Detector with Buffered Output  
♦ Internal 50Ω Input Matching  
♦ External Bias Control for Current Throttleback  
♦ Integrated Bias Circuitry  
♦ +2.7V to +4.2V Single-Supply Operation  
♦ 0.5µA Shutdown Mode  
♦ Tiny Chip-Scale Package (1.5mm ✕ 2mm)  
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.  
Ordering Information  
PIN-  
TOP  
PART  
TEMP RANGE  
PACKAGE  
MARK  
MAX2247EBC-T  
-40°C to +85°C 4 x 3 UCSP*  
AAW  
MAX2247EWC+T -40°C to +85°C 12 WLP  
+AAX  
*Requires special solder temperature profile in the Absolute  
Maximum Ratings Sections.  
-Denotes a package containing lead(Pb).  
+Denotes a lead(pB)-free/RoHS-compliant package.  
T = Tape and reel.  
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.  
Typical Operating Circuit appears at end of data sheet.  
Pin Configuration  
TOP VIEW  
A1  
A2  
A3  
A4  
BIAS  
V 2  
CC  
GND2  
V 1  
CC  
Applications  
IEEE 802.11b DSSS WLAN  
IEEE 802.11g OFDM WLAN  
HomeRF™  
B1  
B3  
B4  
PD_  
OUT  
GND3  
GND1  
MAX2247  
2.4GHz Cordless Phones  
2.4GHz ISM Radios  
C1  
C2  
C3  
C4  
RF_  
OUT  
SHDN  
V
CC  
B
RF_IN  
UCSP is a trademark of Maxim Integrated Products, Inc.  
HomeRF is a trademark of HomeRF Working Group.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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MAX2247EBC 替代型号

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