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MAX2009 Datasheet

1200MHz to 2500MHz Adjustable RF Predistorter

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MAX2009 pdf
19-2929; Rev 0; 8/03
1200MHz to 2500MHz Adjustable
RF Predistorter
General Description
The MAX2009 adjustable RF predistorter is designed to
improve power amplifier (PA) adjacent-channel power
rejection (ACPR) by introducing gain and phase expan-
sion in a PA chain to compensate for the PA’s gain and
phase compression. With its +23dBm maximum input
power level and wide adjustable range, the MAX2009
can provide up to 12dB of ACPR improvement for
power amplifiers operating in the 1200MHz to 2500MHz
frequency band. Lower frequencies of operation can be
achieved with this IC’s counterpart, the MAX2010.
The MAX2009 is unique in that it provides up to 7dB of
gain expansion and 24° of phase expansion as the
input power is increased. The amount of expansion is
configurable through two independent sets of control:
one set adjusts the gain expansion breakpoint
and slope, while the second set controls the same
parameters for phase. With these settings in place, the
linearization circuit can be run in either a static set-and-
forget mode, or a more sophisticated closed-loop
implementation can be employed with real-time soft-
ware-controlled distortion correction. Hybrid correction
modes are also possible using simple lookup tables to
compensate for factors such as PA temperature drift
or PA loading.
The MAX2009 comes in a 28-pin thin QFN exposed
pad (EP) package (5mm x 5mm) and is specified for
the extended (-40°C to +85°C) temperature range.
Applications
WCDMA/UMTS, cdma2000, DCS1800, and
PCS1900 Base Stations
Feed-Forward PA Architectures
Digital Baseband Predistortion Architectures
Military Applications
WLAN Applications
Features
o Up to 12dB ACPR Improvement*
o Independent Gain and Phase Expansion Controls
o Gain Expansion Up to 7dB
o Phase Expansion Up to 24°
o 1200MHz to 2500MHz Frequency Range
o Exceptional Gain and Phase Flatness
o Group Delay <1.3ns (Gain and Phase Sections
Combined)
o ±0.04ns Group Delay Ripple Over a 100MHz Band
o Capable of Handling Input Drives Up to +23dBm
o On-Chip Temperature Variation Compensation
o Single +5V Supply
o Low Power Consumption: 75mW (typ)
o Fully Integrated into Small 28-Pin Thin QFN
Package
*Performance dependent on amplifier, bias, and modulation.
Ordering Information
PART
MAX2009ETI-T
TEMP RANGE
-40°C to +85°C
*EP = Exposed paddle.
PIN-PACKAGE
28 Thin QFN-EP*
Functional Diagram/
Pin Configuration
28 27 26 25 24 23 22
GND* 1
GND* 2
GAIN
CONTROL
21 VCCG
20 GND*
ING 3
19 PBRAW
GND* 4
GND* 5
MAX2009
18 PBEXP
17 PBIN
OUTP 6
GND* 7
PHASE
CONTROL
16 GND*
15 VCCP
8 9 10 11 12 13 14
*INTERNALLY CONNECTED TO EXPOSED GROUND PADDLE.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Maxim
Maxim



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