19-2520; Rev 5; 1/09
KIT
ATION
EVALU
E
BL
AVAILA
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.
♦
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)
Features
MAX2247
Ordering Information
PART
MAX2247EBC-T
MAX2247EWC+T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
4
x
3 UCSP*
12 WLP
TOP
MARK
AAW
+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.
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
TOP VIEW
A1
BIAS
A2
V
CC
2
A3
GND2
A4
V
CC
1
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.
C1
RF_
OUT
C2
SHDN
C3
V
CC
B
C4
RF_IN
B1
GND3
B3
B4
GND1
PD_
OUT
MAX2247
________________________________________________________________
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.
2.4GHz SiGe Linear Power Amplifier
MAX2247
ABSOLUTE MAXIMUM RATINGS
V
CC
1, V
CC
2, V
CC
B, RF_OUT to GND....................-0.3V to +4.5V
SHDN,
BIAS, PD_OUT ................................-0.3V to V
CC_
+ 0.3V
RF Input Power (50Ω source)...........................................+5dBm
RF_IN Input Current............................................................±1mA
Maximum VSWR Without Damage ........................................10:1
Maximum VSWR for Stable Operation, P
OUT
< +25dBm........5:1
Continuous Power Dissipation (T
A
= +70°C)
4
✕
3 UCSP, 12 WLP
(derate 28.5mW/°C above +70°C) ..................................1.3W
Thermal Resistance (Note 1)............................................35°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +125°C
UCSP Bump Temperature (soldering) (Note 2)
Infrared (15s) ...............................................................+220°C
Vapor Phase (60s) .......................................................+215°C
WLP Bump Soldering Temperature .................................+250°C
Continuous Operating Lifetime.....................10yrs
×
0.92
(T
A
- 60°C)
(For Operating Temperature, T
A
≥
+60°C)
Note 1:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
Note 2:
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits the use of only the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not recommended.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
CAUTION!
ESD SENSITIVE DEVICE
DC ELECTRICAL CHARACTERISTICS
(MAX2247 EV kit, V
CC_
= +2.7V to +4.2V,
SHDN
= V
CC
, RF_IN and RF_OUT terminated to 50Ω, T
A
= -40°C to +85°C. Typical values
are at +3V and T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER
Supply Voltage
Idle current = 250mA
with V
CC
= 3.3V
P
OUT
= +24dBm, V
CC_
= 3.3V
P
OUT
= +25dBm, V
CC_
= 4.2V
P
OUT
= +23dBm, V
CC_
= 3.0V
CONDITIONS
MIN
2.7
317
345
305
175
120
85
0.5
2
0.8
-1
-1
+5
+1
10
µA
V
V
µA
µA
mA
TYP
MAX
4.2
350
UNITS
V
Supply Current (Notes 4, 5)
P
OUT
= +21dBm with optimized output-matching circuit.
Refer to the MAX2247 EV kit for details.
P
OUT
= +18dBm with optimized output-matching circuit.
Refer to the MAX2247 EV kit for details.
P
OUT
= +15dBm with optimized output-matching circuit.
Refer to the MAX2247 EV kit for details.
Shutdown Supply Current
Digital Input Logic High
Digital Input Logic Low
Digital Input Current High
Digital Input Current Low
SHDN
= 0, no RF signal applied
2
_______________________________________________________________________________________
2.4GHz SiGe Linear Power Amplifier
AC ELECTRICAL CHARACTERISTICS
(MAX2247 EV kit, V
CC_
= +3V, f
RF
= 2.45GHz,
SHDN
= V
CC
, 50Ω RF system impedance, T
A
= +25°C, unless otherwise noted.) (Note 6)
PARAMETER
RF Frequency Range
(Notes 5, 7)
V
CC_
= 3V, P
OUT
= +23dBm
Power Gain (Notes 3, 5, 9)
V
CC_
= 3.3V, P
OUT
= +24dBm
V
CC_
= 4.2V, P
OUT
= +25dBm
Gain Variation Over Supply
Voltage (Note 5)
Output Power Over Temperature
(Notes 5, 9)
Saturated Output Power
Harmonic Output (2f, 3f, 4f)
Input VSWR
Output VSWR
Power Ramp Turn-On Time
(Note 8)
Power Ramp Turn-Off Time
(Note 10)
RF Output Detector
Response Time
RF Output Detector Voltage
(Note 11)
P
OUT
= +23dBm
P
OUT
= +15dBm
P
OUT
= +7dBm
Over full P
IN
range
Over full P
OUT
range
V
CC
= 3.0V to 3.6V
ACPR: First-side lobe < -32dBc,
second-side lobe < -55dBc
P
IN
= +5dBm
V
CC_
= 3V
V
CC_
= 3.3V
V
CC_
= 4.2V
22
T
A
= +25°C
T
A
= -40°C to +85°C
26
25
29.5
30.5
±0.5
23
24
25
27.8
-45
1.8:1
2:1
0.8
0.8
0.9
1
0.6
0.47
V
2.5:1
2.5:1
1.5
1.5
µs
µs
µs
dBm
dBc
dBm
dB
CONDITIONS
MIN
TYP
2.4 to 2.5
29.5
dB
MAX
UNITS
GHz
MAX2247
3
Note 3:
Characteristics are production tested at T
A
= +25°C. DC specifications over temperature are guaranteed by design
and characterization.
Note 4:
Idle current is controlled by external DAC for best efficiency over the entire output power range.
Note 5:
Parameter is measured with RF modulation based on IEEE 802.11b standard.
Note 6:
Minimum and maximum specifications are guaranteed by design and characterization.
Note 7:
Operation outside this range is possible but not guaranteed.
Note 8:
The total turn-on time required for PA output power to settle to within 0.5dB of the final value.
Note 9:
Specification is corrected for PC board loss of approximately 0.3dB, on the output of the MAX2247 EV kit.
Note 10:
Total turn-off time required for PA supply current to fall below 10µA.
Note 11:
See the
Typical Operating Characteristics
for statistical variation.
_______________________________________________________________________________________
2.4GHz SiGe Linear Power Amplifier
MAX2247
Typical Operating Characteristics
(V
CC_
= 3V, f
RF
= 2.45GHz, with MAX2247 EV kit optimized for P
OUT
= +23dBm. T
A
= +25°C, unless otherwise noted.)
OUTPUT POWER, SUPPLY CURRENT
vs. SUPPLY VOLTAGE
30
28
26
P
OUT
(dBm)
24
22
T
A
= -40°C
20
18
16
2.7
I
CC
3.0
3.3
3.6
3.9
250
4.2
350
300
P
OUT
T
A
= +25°C
T
A
= +85°C
450
400
MAX2247 toc01
OUTPUT POWER, SUPPLY CURRENT
vs. SUPPLY VOLTAGE
550
28
500
SUPPLY CURRENT (mA)
26
24
P
OUT
(dBm)
22
20
18
16
14
2.7
3.0
3.3
3.6
3.9
SUPPLY VOLTAGE (V)
300
I
CC
250
4.2
T
A
= -40°C
350
P
OUT
T
A
= +25°C
T
A
= +85°C
INPUT POWER ADJUSTED TO
KEEP ADJ/ALT CPR = -32dBc/-55dBc
MAX2247 toc02
GAIN vs. SUPPLY VOLTAGE
34
500
SUPPLY CURRENT (mA)
450
400
33
32
GAIN (dB)
31
30
29
28
27
26
25
2.7
3.0
3.3
3.6
3.9
4.2
SUPPLY VOLTAGE (V)
T
A
= +85°C
T
A
= +25°C
P
OUT
= +23dBm
T
A
= -40°C
MAX2247 toc03
INPUT POWER ADJUSTED TO
KEEP ADJ/ALT CPR = -30dBc/-50dBc
550
35
SUPPLY VOLTAGE (V)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2247 toc04
ADJ CPR
vs. SUPPLY VOLTAGE
MAX2247 toc05
ALT CPR
vs. SUPPLY VOLTAGE
-48
-50
-52
ALT CPR (dBc)
-54
-56
-58
-60
T
A
= +25°C
T
A
= +85°C
P
OUT
= +23dBm
MAX2247 toc06
350
340
330
SUPPLY CURRENT (mA)
320
310
300
290
280
270
260
250
P
OUT
= +23dBm
T
A
= +85°C
-24
-26
-28
ADJ CPR (dBc)
-30
-32
-34
-36
-38
-40
P
OUT
= +23dBm
-46
T
A
= +25°C
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
-62
T
A
= -40°C
2.7
3.0
3.3
3.6
3.9
4.2
-64
-66
2.7
3.0
T
A
= -40°C
2.7
3.0
3.3
3.6
3.9
4.2
3.3
3.6
3.9
4.2
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. INPUT POWER
MAX2247 toc07
SUPPLY CURRENT vs. OUTPUT POWER
BIAS CURRENT ADJUSTED
TO KEEP ADJ/ALT CPR =
-32dBc/-55dBc
MAX2247 toc08
ADJ/ALT CPR vs. OUTPUT POWER
-25
-30
ADJ/ALT CPR (dBc)
-35
-40
-45
-50
-55
-60
-65
ALT CPR
ADJ CPR
MAX2247 toc09
40
35
30
P
OUT
(dBm)
25
20
15
10
5
0
-20
-15
-10
-5
0
5
P
IN
(dBm)
V
CC
= +3.0V
V
CC
= +3.3V
V
CC
= +4.2V
300
250
SUPPLY CURRENT (mA)
200
150
100
50
0
10
12
14
16
18
20
22
P
OUT
(dBm)
-20
-70
10
12
14
16
18
20
22
24
P
OUT
(dBm)
4
_______________________________________________________________________________________
2.4GHz SiGe Linear Power Amplifier
Typical Operating Characteristics (continued)
(V
CC_
= 3V, f
RF
= 2.45GHz, with MAX2247 EV kit optimized for P
OUT
= +23dBm. T
A
= +25°C, unless otherwise noted.)
MAX2247
ADJ CPR vs. FREQUENCY
MAX2247 toc10
ALT CPR vs. FREQUENCY
P
OUT
= +23dBm
MAX2247 toc11
SUPPLY CURRENT vs. FREQUENCY
P
OUT
= +23dBm
310
SUPPLY CURRENT (mA)
300
290
280
270
260
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
MAX2247 toc12
-27
-28
-29
-30
ADJ CPR (dBc)
-31
-32
-33
-34
-35
-36
-37
P
OUT
= +23dBm
T
A
= +85°C
T
A
= +25°C
-50
320
-52
ALT CPR (dBc)
T
A
= +25°C
-54
T
A
= +85°C
-56
T
A
= -40°C
T
A
= -40°C
-58
-60
2400
2420
2440
2460
2480
2500
2400
2420
2440
2460
2480
2500
FREQUENCY (MHz)
FREQUENCY (MHz)
2400
2420
2440
2460
2480
2500
FREQUENCY (MHz)
GAIN vs. FREQUENCY
MAX2247 toc13
INPUT/OUTPUT RETURN LOSS
vs. FREQUENCY
MAX2247 toc14
POWER DETECTOR VOLTAGE
vs. OUTPUT POWER
1.4
POWER DETECTOR VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
V
CC
= +4.2V,
T
A
= -40°C
V
CC
= +2.7V,
T
A
= +85°C
MAX2247 toc15
40
P
OUT
= +23dBm
36
T
A
= -40°C
GAIN (dB)
32
-10
-15
RETURN LOSS (dB)
-20
-25
-30
-35
-40
INPUT RETURN
LOSS
OUTPUT RETURN
LOSS
1.6
28
T
A
= +25°C
T
A
= +85°C
24
20
2400
2420
2440
2460
2480
2500
FREQUENCY (MHz)
2400
2420
2440
2460
2480
2500
0
5
10
15
20
25
FREQUENCY (MHz)
P
OUT
(dBm)
OUTPUT POWER HISTOGRAM AT FIXED
1V POWER DETECTOR VOLTAGE
MAX2247 toc16
OUTPUT POWER HISTOGRAM AT FIXED
0.6V POWER DETECTOR VOLTAGE
MAX2247 toc17
OUTPUT POWER HISTOGRAM AT FIXED
0.47V POWER DETECTOR VOLTAGE
SIGMA = 0.38dBm
BASED ON 50 PARTS
20
OCCURRENCES
MAX2247 toc18
16
14
12
OCCURRENCES
10
8
6
4
2
0
SIGMA =
0.25dBm
BASED ON
50 PARTS
20
SIGMA = 0.237dBm
BASED ON 50 PARTS
15
OCCURRENCES
25
15
10
10
5
5
0
22.625
22.875
23.125
23.375
14.408 14.645 14.882 15.119 15.356 15.593
OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
0
6.05
6.43
6.81
7.19
7.57
7.95
OUTPUT POWER (dBm)
_______________________________________________________________________________________
5
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