Datasheet

MAX2009
1200MHz to 2500MHz Adjustable
RF Predistorter
12 ______________________________________________________________________________________
Detailed Description
The MAX2009 adjustable predistorter can provide up to
12dB of ACPR improvement for high-power amplifiers by
introducing gain and phase expansion to compensate
for the PA’s gain and phase compression. The MAX2009
enables real-time software-controlled distortion correc-
tion, as well as set-and-forget tuning through the adjust-
ment of the expansion starting point (breakpoint) and the
rate of expansion (slope). The gain and phase break-
points can be set over a 20dB input power range. The
phase expansion slope is variable from 0.3°/dB to
2.0°/dB and can be adjusted for a maximum of 24° of
phase expansion. The gain expansion slope is variable
from 0.1dB/dB to 0.6dB/dB and can be adjusted for a
maximum of 7dB gain expansion.
The following sections describe the tuning methodology
best implemented with a class A amplifier. Other classes
of operation may require significantly different settings.
Pin Description
PIN NAME FUNCTION
1, 2, 4, 5, 7,
8, 10, 16, 20,
22, 26, 28
GND Ground. Internally connected to the exposed paddle.
3 ING
RF Gain Input. Connect ING to a coupling capacitor if it is not connected to OUTP. ING is
interchangeable with OUTG.
6 OUTP
RF Phase Output. Connect OUTP to a coupling capacitor if it is not connected to INP. OUTP is
interchangeable with INP.
9 INP RF Phase Input. Connect INP to a coupling capacitor. This pin is interchangeable with OUTP.
11 PFS1 Fine Phase-Slope Control Input 1. See the Typical Application Circuit.
12 PFS2 Fine Phase-Slope Control Input 2. See the Typical Application Circuit.
13 PDCS1 Digital Coarse Phase-Slope Control Range Input 1. Set to logical zero for the steepest slope.
14 PDCS2 Digital Coarse Phase-Slope Control Range Input 2. Set to logical zero for the steepest slope.
15 V
CCP
Phase-Control Supply Voltage. Bypass with a 0.01µF capacitor to ground as close to the device as
possible. Phase section can operate without V
CCG
.
17 PBIN Phase Breakpoint Control Input
18 PBEXP Phase Expansion Output. Connect PBEXP to PBRAW to use PBIN as the breakpoint control voltage.
19 PBRAW Uncompensated Phase Breakpoint Input
21 V
CCG
Gain-Control Supply Voltage. Bypass with a 0.01µF capacitor to ground as close to the device as
possible. Gain section can operate without V
CCP
.
23 GBP Gain Breakpoint Control Input
24 GFS Fine Gain-Slope Control Input
25 GCS Coarse Gain-Slope Control Input
27 OUTG RF Gain Output. Connect OUTG to a coupling capacitor. OUTG is interchangeable with ING.
EP GND Exposed Ground Paddle. Solder EP to the ground plane.