MAX2247 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 2.4GHz SiGe Linear Power Amplifier

19-2520; Rev 4; 8/03
2.4GHz SiGe Linear Power Amplifier
General Description
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.
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.
Applications
IEEE 802.11b DSSS WLAN
IEEE 802.11g OFDM WLAN
HomeRF™
2.4GHz Cordless Phones
2.4GHz ISM Radios
UCSP is a trademark of Maxim Integrated Products, Inc.
HomeRF is a trademark of HomeRF Working Group.
Features
♦ 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)
Ordering Information
PART
TEMP RANGE ^PIN-
PACKAGE
TOP
MARK
MAX2247EBC-T -40°C to +85°C 3 x 4 UCSP*
AAW
*Requires special solder temperature profile in the Absolute
Maximum Ratings Sections.
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
Pin Configuration
A1
A2
A3
A4
BIAS
V_CC2
GND2
V_CC1
B1
B3
GND3
MAX2247
PD_
OUT
C1
C2
C3
RF_
OUT
SHDN
V_CCB
B4
GND1
C4
RF_IN
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