19-1912; Rev 3; 11/03
KIT
ATION
EVALU
BLE
AVAILA
2.4GHz to 2.5GHz Linear Power Amplifier
General Description
The MAX2242 low-voltage linear power amplifier (PA) is
designed for 2.4GHz ISM-band wireless LAN applica-
tions. It delivers +22.5dBm of linear output power with
an adjacent-channel power ratio (ACPR) of <-33dBc
1st-side lobe and <-55dBc 2nd-side lobe, compliant
with the IEEE 802.11b 11MB/s WLAN standard with at
least 3dB margin. The PA is packaged in the tiny 3x4
chip-scale package (UCSP™), measuring only 1.5mm x
2.0mm, ideal for radios built in small PC card and com-
pact flash card form factors.
The MAX2242 PA consists of a three-stage PA, power
detector, and power management circuitry. The power
detector provides over 20dB of dynamic range with
±0.8dB accuracy at the highest output power level. An
accurate automatic level control (ALC) function can be
easily implemented using this detector circuit.
The PA also features an external bias control pin.
Through the use of an external DAC, the current can be
throttled back at lower output power levels while main-
taining sufficient ACPR performance. As a result, the
highest possible efficiency is maintained at all power
levels. The device operates over a single +2.7V to
+3.6V power-supply range. An on-chip shutdown fea-
ture reduces operating current to 0.5µA, eliminating the
need for an external supply switch.
o
2.4GHz to 2.5GHz Operating Range
o
+22.5dBm Linear Output Power (ACPR of <-33dBc
1st-Side Lobe and <-55dbc 2nd-Side Lobe)
o
28.5dB Power Gain
o
On-Chip Power Detector
o
External Bias Control for Current Throttleback
o
+2.7V to +3.6V Single-Supply Operation
o
0.5µA Shutdown Mode
o
Tiny Chip-Scale Package (1.5mm
✕
2.0mm)
Features
MAX2242
Ordering Information
PART
MAX2242EBC-T
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
3
✕
4 UCSP
TOP
MARK
AAE
Pin Configuration
RF_IN
C4
GND
B4
V
CC1
A4
________________________Applications
IEEE 802.11b DSSS Radios
Wireless LANs
HomeRF
2.4GHz Cordless Phones
2.4GHz ISM Radios
GND
C3
V
CCB
BIAS
CIRCUIT
A3
SHDN
C2
PD_OUT
B2
A2
V
CC2
Actual Size
DET
1.5mm
✕
2.0mm
C1
B1
RF_OUT
3
✕
4 UCSP
A1
GND
Typical Application Circuit appears at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
BIAS
________________________________________________________________
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.
2.4GHz to 2.5GHz
Linear Power Amplifier
MAX2242
ABSOLUTE MAXIMUM RATINGS
V
CC1
, V
CC2
to GND (no RF signal applied) ..........-0.3V to +5.5V
RF Input Power ...............................................................+10dBm
SHDN,
BIAS, PD_OUT, RF_OUT ................-0.3V to (V
CC
+ 0.3V)
DC Input Current at RF_IN Port.............................-1mA to +1mA
Maximum VSWR Without Damage ........................................10:1
Maximum VSWR for Stable Operation.....................................5:1
Continuous Power Dissipation (T
A
= +85°C)
3
✕
4 UCSP (derate 80mW/°C above +85°C) ..................1.6W
Operating Temperature Range ...........................-40°C to +85°C
Thermal Resistance .........................................................25°C/W
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +125°C
Lead Temperature (soldering, 10s) .................................+260°C
Continuous Operating Lifetime.....................10yrs
×
0.92
(T
A
- 60°C)
(For Operating Temperature, T
A
≥
+60°C)
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
(V
CC
= +2.7V to +3.6V, f
IN
= 2.4GHz to 2.5GHz, V
SHDN
= V
CC
, RF_IN = RF_OUT = connected to 50Ω load, T
A
= -40°C to +85°C.
Typical values are measured at V
CC
= +3.3V, f
IN
= 2.45GHz, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
P
OUT
= +22dBm, V
CC
= +3.3V, idle current = 280mA
Supply Current
(Notes 2, 3, 6)
Shutdown Supply Current
Logic Input Voltage High
Logic Input Voltage Low
Logic Input Current High
Logic Input Current Low
-1
-1
P
OUT
= +13dBm, idle current = 55mA
P
OUT
= +5dBm, idle current = 25mA
V
SHDN
= 0, no RF input
2.0
0.8
5
1
CONDITIONS
MIN
2.7
300
90
50
0.5
10
µA
V
V
µA
µA
TYP
MAX
3.6
335
mA
UNITS
V
2
_______________________________________________________________________________________
2.4GHz to 2.5GHz
Linear Power Amplifier
AC ELECTRICAL CHARACTERISTICS
(MAX2242 Evaluation Kit, V
CC
= +3.3V, V
SHDN
= V
CC
, 50Ω source and load impedance, f
IN
= 2.45GHz, T
A
= +25°C, unless other-
wise noted.) (Note 6)
PARAMETER
Frequency Range (Notes 3, 4)
Power Gain (Notes 1, 3)
Gain Variation Over Temperature
(Note 3)
Gain Variation Over V
CC
(±10%)
(Note 3)
Output Power (Notes 3, 5, 8)
Saturated Output Power
Harmonic Output (2f, 3f, 4f)
Input VSWR
Output VSWR
Power Ramp Turn-On Time
(Note 7)
Power Ramp Turn-Off Time
(Note 7)
RF Output Detector Response
TIme
P
o
= +22dBm (Note 9)
RF Output Detector Voltage
P
o
= +13dBm (Note 9)
P
o
= +5dBm (Note 9)
Over full P
IN
range
Over full P
OUT
range
SHDN
from low to high
SHDN
from high to low
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= -40°C to +85°C
V
CC
= +3.0V to +3.6V
ACPR,
1
st
-side lobe < -33dBc,
2
nd
-side lobe < -55dBc
P
IN
= +5dBm
CONDITIONS
MIN
2.4
26.5
25.5
±1.2
±0.3
28.5
TYP
MAX
2.5
UNITS
GHz
dB
dB
dB
MAX2242
21.5
22.5
26.5
-40
1.5:1
2.5:1
1
1
2.5
1.8
0.9
0.55
1.5
1.5
5
dBm
dBm
dBc
µs
µs
µs
V
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Specifications over T
A
= -40°C to +85°C are guaranteed by design. Production tests are performed at T
A
= +25°C.
Idle current is controlled by external DAC for best efficiency over the entire output power range.
Parameter measured with RF modulation based on IEEE 802.11b standard.
Power gain is guaranteed over this frequency range. Operation outside this range is possible, but is not guaranteed.
Output two-tone third-order intercept point (OIP3) is production tested at T
A
= +25°C. The OIP3 is tested with two signals at
f1 = 2.450GHz and f2 = 2.451GHz with fixed P
IN
.
Min/max limits are guaranteed by design and characterization.
The total turn-on and turn-off times required for PA output power to settle to within 0.5dB of the final value.
Excludes PC board loss of approximately 0.15dB.
See
Typical Operating Characteristics
for statistical variation.
_______________________________________________________________________________________
3
2.4GHz to 2.5GHz
Linear Power Amplifier
MAX2242
Typical Operating Characteristics
(V
CC
= +3.3V, f
IN
= 2.45MHz, RF modulation = IEEE 802.11b, V
SHDN
= V
CC
, T
A
= +25°C, unless otherwise noted.)
GAIN vs. SUPPLY VOLTAGE
MAX2242 toc01
I
CC
vs. SUPPLY VOLTAGE
320
P
O
= +22dBm
28
27
26
25
24
23
22
21
20
19
18
17
16
15
MAX2242 toc02
OUTPUT POWER vs. INPUT POWER
MAX2242 toc03
31
P
O
= +22dBm
30
T
A
= +25°C
T
A
= -40°C
GAIN (dB)
I
CC
(mA)
29
280
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
28
T
A
= +85°C
260
27
240
IDLE CURRENT SET TO 280mA
AT V
CC
= +3.3V, T
A
= +25°C
220
26
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
300
2.7
3.0
3.3
3.6
-15 -13 -11 -9
-7 -5
-3 -1
1
3
5
SUPPLY VOLTAGE (V)
INPUT POWER (dBm)
I
CC
vs. OUTPUT POWER
MAX2242 toc04
ACPR vs. OUTPUT POWER
-24
-25
-26
-27
-28
-29
-30
-31
-32
-33
-34
-35
-36
-37
-38
-39
-40
16
MAX2242 toc05
ACPR vs. FREQUENCY
P
OUT
= +22 dBm
MAX2242 toc06
330
300
270
240
210
I
CC
(mA)
180
150
120
90
60
30
0
0
2
4
6
T
A
= +85°C
T
A
= +25°C
IDLE CURRENT ADJUSTED TO
KEEP ACPR/ALT = -33/-55dBc
T
A
= -40°C
-32
IDLE CURRENT = 280mA
-33
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
-35
17
18
19
20
21
22
23
24
25
2400
2425
2450
FREQUENCY (MHz)
2475
2500
OUTPUT POWER (dBm)
ACPR (dBc)
-34
8 10 12 14 16 18 20 22
OUTPUT POWER (dBm)
ACPR (dBc)
I
CC
vs. FREQUENCY
MAX2242 toc07
POWER DETECTOR VOLTAGE
vs. OUTPUT POWER
MAX2242 toc08
OUTPUT POWER HISTOGRAM AT FIXED
1.6V POWER DETECTOR VOLTAGE
SIGMA = 0.14dBm
BASED ON
100 PARTS
MAX2242 toc09
320
315
310
I
CC
(mA)
305
300
295
290
285
280
2400
2425
2450
FREQUENCY (MHz)
2475
T
A
= -40°C
P
O
= +22dBm
T
A
= +25°C
2
POWER DETECTOR VOLTAGE (V)
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0
2
T
A
= +85°C
OCCURENCES
V
CC
= +3.0V, T
A
= +25°C
V
CC
= +3.3V, T
A
= +85°C
V
CC
= +3.3V, T
A
= -40°C
V
CC
= +3.6V, T
A
= +25°C
V
CC
= +3.3V, T
A
= +25°C
30
25
20
15
10
5
0
V
CC
= +2.7V, T
A
= +25°C
4
6
8 10 12 14 16 18 20 22
2500
21.6
21.8
22
22.2
22.4
OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
4
_______________________________________________________________________________________
p2.4GHz to 2.5GHz
Linear Power Amplifier
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, f
IN
= 2.45MHz, RF modulation = IEEE 802.11b, V
SHDN
= V
CC
, T
A
= +25°C, unless otherwise noted.)
OUTPUT POWER HISTOGRAM AT FIXED
0.8V POWER DETECTOR VOLTAGE
MAX2242 toc10
MAX2242
OUTPUT POWER HISTOGRAM AT FIXED
0.5V POWER DETECTOR VOLTAGE
SIGMA = 0.75dBm
BASED ON 100 PARTS
MAX2242 toc11
25
SIGMA = 0.25dBm
BASED ON 100 PARTS
20
20
OCCURRENCES
15
OCCURRENCES
12.1 12.3 12.5 12.7 12.9 13.1 13.3 13.5 13.7
OUTPUT POWER (dBm)
15
10
10
5
5
0
0
2.2
2.8
3.4 4.0
4.6
5.2 5.8
6.4 7.0
OUTPUT POWER (dBm)
S11, S22, vs. FREQUENCY
MAX2242 toc12
MAX2242
S21 vs. FREQUENCY
P
IN
= -15dBm
29
MAX2242 toc13
30
-1
-3
S11, S22 (dB)
-5
-7
-9
-11
-13
-15
P
IN
= -15dBm
S22
S21 (dB)
S11
2400
2420
2440
2460
2480
2500
28
27
26
25
2400
2420
2440
2460
2480
2500
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
5
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