Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2010ETI+

General Description

The MAX2010 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 MAX2010

can provide up to 12dB of ACPR improvement for

power amplifiers operating in the 500MHz to 1100MHz

frequency band. Higher frequencies of operation can

be achieved with this IC’s counterpart, the MAX2009.

The MAX2010 is unique in that it provides up to 6dB of

gain expansion and 21° of phase expansion as the input

power is increased. The amount of expansion is config-

urable 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 software-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 MAX2010 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

cdma2000™, GSM/EDGE, and iDEN Base Stations

Feed-Forward PA Architectures

Digital Baseband Predistortion Architectures

Military Applications

Features

♦ Up to 12dB ACPR Improvement*

♦ Independent Gain and Phase Expansion Controls

♦ Gain Expansion Up to 6dB

♦ Phase Expansion Up to 21°

♦ 500MHz to 1100MHz Frequency Range

♦ Exceptional Gain and Phase Flatness

♦ Group Delay <2.4ns (Gain and Phase Sections

Combined)

♦ ±0.03ns Group Delay Ripple Over a 100MHz Band

♦ Capable of Handling Input Drives Up to +23dBm

♦ On-Chip Temperature Variation Compensation

♦ Single +5V Supply

♦ Low Power Consumption: 75mW (typ)

♦ Fully Integrated into Small 28-Pin Thin QFN

Package

*Performance dependent on amplifier, bias, and modulation.

MAX2010

500MHz to 1100MHz Adjustable

RF Predistorter

________________________________________________________________ Maxim Integrated Products 1

28 27 26 25 24 23 22

8 9 10 11 12 13 14

MAX2010

GAIN

CONTROL

PHASE

CONTROL

GND*

ING

GND*

OUTP

GND*

CCG

GND*

PBRAW

PBEXP

PBIN

GND*

CCP

GND*

INP

GND*

PFS1

PFS2

PDCS1

PDCS2

GND*

OUTG

GND*

GCS

GFS

GBP

GND*

*INTERNALLY CONNECTED TO EXPOSED GROUND PADDLE.

Functional Diagram/

Pin Configuration

Ordering Information

19-2930; Rev 0; 8/03

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.

*EP = Exposed paddle.

PART TEMP RANGE PIN-PACKAGE

MAX2010ETI-T -40°C to +85°C 28 Thin QFN-EP*

cdma2000 is a trademark of Telecommunications Industry

Assoc.

Summary of content (19 pages)

PAGE 1
9-2930; Rev 0; 8/03 500MHz to 1100MHz Adjustable RF Predistorter The MAX2010 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. Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Up to 12dB ACPR Improvement* Independent Gain and Phase Expansion Controls Gain Expansion Up to 6dB Phase Expansion Up to 21° 500MHz to 1100MHz Frequency Range Exceptional Gain and Phase Flatness Group Delay <2.4ns (Gain and Phase Sections Combined) ±0.
PAGE 2
MAX2010 500MHz to 1100MHz Adjustable RF Predistorter ABSOLUTE MAXIMUM RATINGS VCCG, VCCP to GND ..............................................-0.3V to +5.5V ING, OUTG, GCS, GFS, GBP to GND......-0.3V to (VCCG + 0.3V) INP, OUTP, PFS_, PDCS_, PBRAW, PBEXP, PBIN to GND ............................-0.3V to (VCCP + 0.3V) Input (ING, INP, OUTP, OUTG) Level ............................+23dBm PBEXP Output Current ........................................................
PAGE 3
500MHz to 1100MHz Adjustable RF Predistorter (MAX2010 EV kit, VCCG = VCCP = +4.75V to +5.25V, 50Ω environment, PIN = -20dBm, fIN = 500MHz to 1100MHz, VGCS = +1.0V, VGFS = +5.0V, VGBP = +1.2V, VPBIN = VPDCS1 = VPDCS2 = 0V, VPF_S1 = +5V, VPBRAW = VPBEXP, TA = -40°C to +85°C. Typical values are at fIN = 880MHz, VCCG = VCCP = +5V, TA = +25°C, unless otherwise noted.) (Notes 1, 2) PARAMETER CONDITIONS Operating Frequency Range VSWR MIN TYP 500 ING, INP, OUTG, OUTP MAX UNITS 1100 MHz 1.
PAGE 4
MAX2010 500MHz to 1100MHz Adjustable RF Predistorter AC ELECTRICAL CHARACTERISTICS (continued) (MAX2010 EV kit, VCCG = VCCP = +4.75V to +5.25V, 50Ω environment, PIN = -20dBm, fIN = 500MHz to 1100MHz, VGCS = +1.0V, VGFS = +5.0V, VGBP = +1.2V, VPBIN = VPDCS1 = VPDCS2 = 0V, VPF_S1 = +5V, VPBRAW = VPBEXP, TA = -40°C to +85°C. Typical values are at fIN = 880MHz, VCCG = VCCP = +5V, TA = +25°C, unless otherwise noted.) (Notes 1, 2) PARAMETER CONDITIONS MIN TYP MAX UNITS GAIN CONTROL SECTION -14.
PAGE 5
00MHz to 1100MHz Adjustable RF Predistorter Phase Control Section (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) SMALL-SIGNAL INPUT RETURN LOSS vs. FREQUENCY TA = +25°C 6.1 6.0 5.9 TA = -40°C 5.8 20 C 30 D 40 5.7 4.95 5.05 5.15 5.25 0.9 1.0 0.
PAGE 6
Typical Operating Characteristics (continued) Phase Control Section (continued) (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) SMALL-SIGNAL GAIN vs. COARSE SLOPE VPF_S1 = 1.5V -5.0 GAIN (dB) VCCP = 4.75V, 5.0V, 5.25V -5.5 -5.5 VPF_S1 = 5V -6.0 -6.5 -6.5 -6.5 1.0 -7.0 PDCS1 = 0 PDCS2 = 0 1.1 GROUP DELAY vs. FREQUENCY 1.40 1.35 A 1.30 C 6.4 6.2 D 5.8 B 5.6 0.5 0.6 0.7 0.8 B 0.
PAGE 7
500MHz to 1100MHz Adjustable RF Predistorter Phase Control Section (continued) (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) PHASE EXPANSION vs. INPUT POWER C -5.1 B -5.3 C -4.9 B 0 A -5 3 8 13 18 -7 INPUT POWER (dBm) D = VPBIN = 1.5V A = VPBIN = 0V E = VPBIN = 2.0V B = VPBIN = 0.5V C = VPBIN = 1.0V F = VPBIN = 2.
PAGE 8
Typical Operating Characteristics (continued) Phase Control Section (continued) (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) GAIN EXPANSION vs. INPUT POWER GAIN (dB) -4.6 TA = -40°C -4.8 -5.0 VPDCS1 = 5.0, VPF_S1 = 1.5V -5 PHASE (DEGREES) -4.4 MAX2010 toc20 VPDCS1 = 5.0, VPF_S1 = 1.5V -4.2 PHASE EXPANSION vs. INPUT POWER 0 MAX2010 toc19 -4.0 TA = +25°C -5.2 -10 TA = +25°C -15 TA = +85°C -5.
PAGE 9
500MHz to 1100MHz Adjustable RF Predistorter Gain Control Section (continued) (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) LARGE-SIGNAL OUTPUT RETURN LOSS vs. FREQUENCY D 20 C A 30 PIN = +15dBm 10 D TA = -40°C -13 C -14 20 A 30 TA = +25°C -15 TA = +85°C -16 -17 B -18 40 B 40 MAX2010 toc25 10 SMALL-SIGNAL GAIN vs.
PAGE 10
Typical Operating Characteristics (continued) Gain Control Section (continued) (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) NOISE FIGURE vs. FREQUENCY 1.1 A 25 SUPPLY CURRENT (mA) C, D 1.2 A 25 NOISE FIGURE (dB) 1.3 30 MAX2010 toc31 MAX2010 toc30 1.4 SUPPLY CURRENT vs. INPUT POWER 30 B 20 C 15 1.0 10 B 0.6 0.7 0.8 0.9 1.0 0.
PAGE 11
500MHz to 1100MHz Adjustable RF Predistorter Gain Control Section (continued) (MAX2010 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 880MHz, TA = +25°C unless otherwise noted.) GAIN EXPANSION vs. INPUT POWER E -9 F -11 -14 C D A, B -13 D -15 -17 C -19 A, B 10 E 0 C D A, B -21 -17 20 PHASE (DEGREES) -11 GAIN (dB) GAIN (dB) F -7 PHASE EXPANSION vs. INPUT POWER 30 MAX2010 toc37 -8 MAX2010 toc35 E -5 MAX2010 toc36 GAIN EXPANSION vs.
PAGE 12
MAX2010 500MHz to 1100MHz Adjustable RF Predistorter 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.
PAGE 13
500MHz to 1100MHz Adjustable RF Predistorter Phase Expansion Breakpoint The phase expansion breakpoint is typically controlled by a digital-to-analog converter (DAC) connected through the PBIN pin. The PBIN input voltage range of 0V to VCC corresponds to a breakpoint input power range of 0.7dBm to 23dBm. To achieve optimal performance, the phase expansion breakpoint of the MAX2010 must be set to equal the phase compression breakpoint of the PA.
PAGE 14
MAX2010 500MHz to 1100MHz Adjustable RF Predistorter PFS1 PF_S1 PHASE-CONTROL CIRCUITRY PFS2 2 PDCS1 PDCS2 SWITCH CONTROL MAX2010 Figure 2. Simplified Phase Slope Internal Circuitry PA GAIN COMPRESSION MAX2010 GAIN EXPANSION IMPROVED GAIN DISTORTION PIN (dBm) COMBINED GAIN (dB) SLOPE MAX2010 GAIN (dB) PA GAIN (dB) BREAKPOINT PIN (dBm) PIN (dBm) Figure 3.
PAGE 15
500MHz to 1100MHz Adjustable RF Predistorter Gain Expansion Slope In addition to properly setting the breakpoint, the gain expansion slope of the MAX2010 must also be adjusted to compensate for the PA’s gain compression. The slope should be set using the following equation: MAX2010 _ SLOPE = −PA _ SLOPE 1 + PA _ SLOPE where: MAX2010_SLOPE = MAX2010 gain section’s slope in dB/dB. PA_SLOPE = PA’s gain slope in dB/dB, a negative number for compressive behavior.
PAGE 16
MAX2010 500MHz to 1100MHz Adjustable RF Predistorter POWER AMPLIFIER POUT = 7dBm 6 OUTP 3 ING MAX2010 PREAMPLIFIER 9 INP OUTG 27 PIN = 14dBm 11 PFS1 GBP 23 VPF_S1 = 1.5V 12 PFS2 PHASE CONTROL 19 PBRAW 18 PBEXP VPBIN = 0.8V GAIN CONTROL PBIN PDCS1 PDCS2 GCS 17 25 13 14 GFS 24 VPDCS1 = 0V VPDCS2 = 5V Figure 4. AM-PM Response Tuning Circuit Power-Supply Bypassing Bypass each VCC pin with a 0.01µF capacitor. Table 1.
PAGE 17
500MHz to 1100MHz Adjustable RF Predistorter MAX2010 PREAMPLIFIER GAIN = 7dB 6 3 OUTP ING MAX2010 POWER AMPLIFIER PREAMPLIFIER 9 INP OUTG 27 PIN = 14dBm 11 PFS1 GBP 23 VPF_S1 = 1.5V 12 PFS2 PHASE CONTROL 19 PBRAW 18 PBEXP VPBIN = 0.8V GAIN CONTROL PBIN PDCS1 PDCS2 GCS 17 25 13 14 GFS 24 VGBP = 1V VPDCS1 = 0V VGFS = 1.5V VPDCS2 = 5V VGCS = 1V Figure 5.
PAGE 18
500MHz to 1100MHz Adjustable RF Predistorter MAX2010 Typical Application Circuit 28 GND* GND* L2 C10 PREAMPLIFER OUTP GND* C12 GND* GBP GFS GCS 21 GAIN CONTROL 2 20 3 19 4 18 MAX2010 5 17 PHASE CONTROL 6 16 7 15 9 INP GND* PREAMPLIFER 22 1 8 10 L1 C1 23 11 C2 12 13 14 VCCG GND* C5 PBRAW PBEXP PBIN CONTROL UNIT GND* VCCP C4 PDCS2 ING 24 PDCS1 C8 25 PFS2 GND* 26 PFS1 OPTIONAL MATCH COMPENSATION 27 GND* GND* GND* GND* POWER AMPLIFER OUTG C6 C3 R2
PAGE 19
500MHz to 1100MHz Adjustable RF Predistorter b CL 0.10 M C A B D2/2 D/2 PIN # 1 I.D. QFN THIN.EPS D2 0.15 C A D k 0.15 C B PIN # 1 I.D. 0.35x45 E/2 E2/2 CL (NE-1) X e E E2 k L DETAIL A e (ND-1) X e CL CL L L e e 0.10 C A C 0.08 C A1 A3 PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE 16, 20, 28, 32L, QFN THIN, 5x5x0.8 mm APPROVAL COMMON DIMENSIONS DOCUMENT CONTROL NO. REV. 21-0140 C 1 2 EXPOSED PAD VARIATIONS NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.