19-2204; Rev 2; 8/03
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
General Description
The MAX2244/MAX2245/MAX2246 single-supply, low-
voltage power amplifiers (PAs) are designed for 20dBm
Bluetooth™ Class 1 applications in the 2.4GHz to 2.5GHz
band. The MAX2244/MAX2245 deliver a peak output
power of 22dBm with greater than 20dB output-power
control range. The 22dBm output power compensates for
the filter loss between the PA and the antenna, allowing
20dBm to be delivered to the antenna. The MAX2246 pro-
vides a peak output power of 20dBm for a 30% reduction
in supply current.
The PAs integrate a power detector and closed-loop
power-control circuitry to provide nearly constant output
power over the full range of supply voltage, temperature,
and input power level. The voltage at the analog control
input precisely controls the output power level.
The MAX2244/MAX2245/MAX2246 feature a low-current
shutdown mode through a simple logic input. Internal cir-
cuitry automatically controls the ramp-up/down of the
output power level during turn-on and turn-off to meet
Bluetooth spurious emissions requirements.
The devices operate from a 3V to 3.6V single supply.
The MAX2244/MAX2246 have a power-control voltage
range of 0.5V to 2V, and the MAX2245 has a control
voltage range of 0.9V to 2.2V. The devices are pack-
aged in a miniature ultra chip-scale package (UCSP™),
significantly reducing the required board area.
o
2.4GHz to 2.5GHz Operation
o
Accurate Closed-Loop Output Power Control
Over Full Temperature, Supply, and Input Power
Range
o
Convenient Analog Power-Control Interface
o
22dBm Peak Output Power (MAX2244/MAX2245)
o
20dBm Peak Output with 30% Reduced Supply
Current (MAX2246)
o
Internal Bandwidth-Limited Power Ramping
o
50Ω Integrated Input Match
o
0.5µA Shutdown Supply Current
o
Ultra Chip-Scale Package (1.56mm
✕
1.56mm)
Features
MAX2244/MAX2245/MAX2246
Ordering Information
PART
MAX2244EBL-T
MAX2245EBL-T
MAX2246EBL-T
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
BUMP
PACKAGE
9 UCSP*-9
9 UCSP*-9
9 UCSP*-9
TOP
MARK
AAP
AAQ
AAY
Applications
Bluetooth Class 1 Radios
802.11 FHSS/HomeRF™ Radios
2.4GHz Cordless Phones
*UCSP
reliability is integrally linked to the user's assembly
methods, circuit board material, and environment. See the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.
Pin Configuration appears at end of data sheet.
Functional Diagram
V
CC1
C2
SHUTDOWN
BIAS
V
CC2
A2
RFIN/
SHDN
B1
MATCH
MATCH
MATCH
B3
RFOUT
MAX2244
MAX2245
MAX2246
PC
A1
ANALOG
INTERFACE
C3
GND
C1
GND
CONTROL
AMP
POWER
DETECTOR
B2
GND
A3
GND
Bluetooth is a trademark of Ericsson Corp.
UCSP is a trademark of Maxim Integrated Products, Inc.
HomeRF is a trademark of The HomeRF Working Group.
1
________________________________________________________________
Maxim Integrated Products
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.
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
MAX2244/MAX2245/MAX2246
ABSOLUTE MAXIMUM RATINGS
V
CC1
, V
CC2
, RFOUT to GND .................................-0.3V to +6.0V
RFIN/SHDN, PC to GND.............................-0.3V to (V
CC
+ 0.3V)
RF Input Power (RFIN)....................................................+10dBm
Load Mismatch (VSWR) Without Damage ..............................6:1
Continuous Power Dissipation (T
A
= +85°C)
9-Pin UCSP (derate 8.8mW/°C above T
A
= +85°C).....700mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Continuous Operating Lifetime............10 years x 0.935
(T
A
- 65°C)
(for operating temperature 65°C < T
A
< 85°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
(Typical Application Circuit, V
CC
= 3V to 3.6V, no RF signals applied, V
SHDN
≥
2V, V
PC
= 0, T
A
= -40°C to +85°C, unless otherwise
noted. Typical values are at V
CC
= 3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
V
PC
= 0.5V, T
A
= +25°C
MAX2244
P
RFIN
= 0 to 4dBm,
2.45GHz
V
PC
= 0.5V, T
A
= -40°C to +85°C
V
PC
= 2V, T
A
= +25°C
V
PC
= 2V, T
A
= -40°C to +85°C
V
PC
= 0.9V, T
A
= +25°C
Supply Current (Note 2)
MAX2245
P
RFIN
= 0 to 4dBm,
2.45GHz
V
PC
= 0.9V, T
A
= -40°C to +85°C
V
PC
= 2.2V, T
A
= +25°C
V
PC
= 2.2V, T
A
= -40°C to +85°C
V
PC
= 0.5V, T
A
= +25°C
MAX2246
V
PC
= 0.5V, T
A
= -40°C to +85°C
P
RFIN
= 0 to 4dBm,
V
PC
= 2V, T
A
= +25°C
2.45GHz
V
PC
= 2V, T
A
= -40°C to +85°C
Shutdown Supply Current
SHDN
Input Voltage High
SHDN
Input Voltage Low
SHDN
Input Current
PC Input Voltage Range
PC Input Current
Active control range
MAX2244/MAX2246
MAX2245
-1
0.5
0.9
-15
-20
SHDN
= GND
2.0
0.6
1
2.0
2.5
5
10
42
118
0.5
179
65
172
CONDITIONS
MIN
3.0
65
TYP
MAX
3.6
83
98
200
205
87
93
195
208
55
61
140
144
10
µA
V
V
µA
V
µA
mA
UNITS
V
MAX2244/MAX2246, V
PC
= 0 to 2.5V
MAX2245, V
PC
= 0 to 3V
2
_______________________________________________________________________________________
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
AC ELECTRICAL CHARACTERISTICS
(Typical Application Circuit, V
CC
= 3V, P
RFIN
= 0 to 4dBm, f
RFIN
= 2.45GHz, 50Ω system, V
SHDN
≥
2V, T
A
= +25°C, unless otherwise
noted. Typical values are at V
CC
= 3V, P
RFIN
= 2dBm, f
RFIN
= 2.45GHz, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Frequency Range (Note 3)
Input Power
MAX2244, V
PC
= 0.5V
MAX2244, V
PC
= 2V
MAX2245, V
PC
= 0.9V
Output Power (Note 2)
MAX2245, V
PC
= 2.2V
MAX2246, V
PC
= 0.5V
MAX2246, V
PC
= 2V
Harmonic Output (Notes 2, 4)
Shutdown Mode Output (Note 2)
In-Band Spurious (Notes 2, 3, 5)
Nonharmonic Spurious Output
(Note 2)
Power Ramp Turn-On Time
(Notes 2, 6)
Power Ramp Turn-Off Time
(Notes 2, 7)
Input VSWR (Note 2)
P
RFOUT
at any level
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C to +85°C
MAX2244/MAX2245
MAX2246
CONDITIONS
MIN
2.4
0
0
20.5
20
0
20.5
20
-4.5
19
17
-7
-16
-20
-20
-40
-30
4
4
1.8
1.8
1.5:1
2:1
0.5
20
4
22.0
4
22.0
TYP
MAX
2.5
4
7
23.5
24
7
23.5
24
5.5
21
21
-1
-13
-30
dBm
dBm
dBc
dBm
dBm
µs
µs
dBm
UNITS
GHz
dBm
MAX2244/MAX2245/MAX2246
V
SHDN
≤
0.6V, P
RFIN
= 4dBm
Frequency offset =
±500kHz
Frequency offset =
±1.5MHz
Frequency offset = ±2.5MHz
All power levels, load VSWR
≤
3:1
MAX2244/MAX2246, V
PC
steps from 0 to 2V
MAX2245/MAX2246, V
PC
steps from 0 to 2.5V
MAX2244, V
PC
steps from 2V to 0
MAX2245, V
PC
steps from 2.5V to 0
R
S
= 50Ω, over full P
RFIN
range
Note 1:
Limits are 100% production tested at T
A
= +25°C. Limits over the entire operating temperature range are guaranteed by
design and characterization, but are not production tested.
Note 2:
Guaranteed by design and characterization.
Note 3:
Assumes the output is optimally matched to cover the 2.4GHz to 2.5GHz band.
Note 4:
Valid for the case in which the output stage is matched with a two-section transmission line, lowpass matching network to
minimize the 2nd and 3rd harmonics, as shown in the
Typical Application Circuit.
Note 5:
Output measured in a 100kHz RBW. Power on/off duty cycle = 50%. Test signal: GFSK, BT = 0.5, 1 bit/symbol, 1Mbps,
frequency deviation = 175kHz.
Note 6:
The total turn-on and settling time required for the PA output power to settle to within ±1dB of the final value.
Note 7:
The total turn-off time for the PA output power to drop to -10dBm.
_______________________________________________________________________________________
3
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
MAX2244/MAX2245/MAX2246
Typical Operating Characteristics
(Typical Application Circuit, V
CC
= 3V, P
RFIN
= 2dBm, f
RFIN
= 2.45GHz,
SHDN
= V
CC
, T
A
= +25°C, unless otherwise noted.)
MAX2244
OUTPUT POWER vs. POWER CONTROL (V
PC
)
MAX2244-46 toc01
MAX2244
OUTPUT POWER vs. POWER CONTROL (V
PC
)
20
V
CC
= 4V
MAX2244-46 toc02
MAX2244 SUPPLY CURRENT
vs. POWER CONTROL (V
PC
)
MAX2244-46 toc03
200
20
OUTPUT POWER (dBm)
T
A
= +85°C
10
10
V
CC
= 3V
SUPPLY CURRENT (mA)
OUTPUT POWER (dBm)
150
T
A
= +85°C
100
T
A
= +25°C
50
T
A
= -40°C
0
T
A
= +25°C
-10
T
A
= -40°C
0
-10
V
CC
= 5.0V
-20
0
0.5
1.0
1.5
2.0
2.5
V
PC
(V)
-20
0
0.5
1.0
1.5
2.0
2.5
V
PC
(V)
0
0
0.5
1.0
V
PC
(V)
1.5
2.0
2.5
MAX2244
OUTPUT POWER vs. FREQUENCY
MAX2244-46 toc04
MAX2244
OUTPUT POWER vs. INPUT POWER
MAX2244-46 toc05
MAX2244
HARMONIC OUTPUT SPECTRUM
V
PC
= 2V
MAX2244-46toc06
25
V
PC
= 2.0V
20
OUTPUT POWER (dBm)
V
PC
= 1.0V
15
25
V
PC
= 2V
20
OUTPUT POWER (dBm)
V
PC
= 1V
15
0dBm
10dB/div
10
f
O
V
PC
= 0.5V
5
2f
O
3f
O
4f
O
5f
O
10
V
PC
= 0.5V
5
0
2.40
2.42
2.44
2.46
2.48
2.50
FREQUENCY (GHz)
0
-15
-10
-5
INPUT POWER (dBm)
0
5
0.1
FREQUENCY (GHz)
13
MAX2244
FSK MODULATED OUTPUT SPECTRUM
V
PC
= 2V
MAX2244-46 toc07
MAX2244
POWER-ON/OFF CHARACTERISTICS
30
20
OUTPUT POWER (dBm)
10
0
-10
-20
-30
-40
P
RFOUT
MAX2244-46 toc08
5
4
3
V
SHDN
(V)
2
1
0
0dBm
V
SHDN
10dB/div
2.45GHz
0.5MHz/div
TIME (2µs/div)
4
_______________________________________________________________________________________
2.5GHz, 22dBm/20dBm Power Amplifiers with
Analog Closed-Loop Power Control
Typical Operating Characteristics (continued)
(Typical Application Circuit, V
CC
= 3V, P
RFIN
= 2dBm, f
RFIN
= 2.45GHz,
SHDN
= V
CC
, T
A
= +25°C, unless otherwise noted.)
MAX2245
OUTPUT POWER vs. POWER CONTROL (V
PC
)
20
OUTPUT POWER (dBm)
MAX2244-46 toc09
MAX2244/MAX2245/MAX2246
MAX2245
OUTPUT POWER vs. POWER CONTROL (V
PC
)
20
V
CC
= 4V
OUTPUT POWER (dBm)
V
CC
= 5V
10
V
CC
= 3V
MAX2244-46 toc10
MAX2245
SUPPLY CURRENT vs. POWER CONTROL (V
PC
)
MAX2244-46 toc11
200
T
A
= +85°C
SUPPLY CURRENT (mA)
150
10
T
A
= +85°C
100
T
A
= +25°C
T
A
= -40°C
0
0
-10
T
A
= +25°C
T
A
= -40°C
-10
50
-20
0
0.5
1.0
1.5
V
PC
(V)
2.0
2.5
3.0
-20
0
0.5
1.0
1.5
V
PC
(V)
2.0
2.5
3.0
0
0
0.5
1.0
1.5
V
PC
(V)
2.0
2.5
3.0
MAX2245
OUTPUT POWER vs. FREQUENCY
MAX2244-46 toc12
MAX2245
OUTPUT POWER vs. INPUT POWER
MAX2244-46 toc13
MAX2245
HARMONIC OUTPUT SPECTRUM
V
PC
= 2.2V
MAX2244/45 toc14
25
V
PC
= 2.5V
20
OUTPUT POWER (dBm)
V
PC
= 1.5V
15
25
V
PC
= 2.5V
20
OUTPUT POWER (dBm)
V
PC
= 1.5V
15
0dBm
10dB/div
10
f
O
V
PC
= 1V
5
2f
O
3f
O
4f
O
10
V
PC
= 1V
5
5f
O
0
2.40
2.42
2.44
2.46
2.48
2.50
FREQUENCY (GHz)
0
-15
-10
-5
INPUT POWER (dBm)
0
5
0.1
FREQUENCY (GHz)
13
MAX2245
FSK MODULATED OUTPUT SPECTRUM
MAX2244-46 toc15
SHUTDOWN CURRENT vs. TEMPERATURE
MAX2244-46 toc16
V
PC
= 2.2V
800
SHUTDOWN CURRENT (nA)
0dBm
600
10dB/div
400
200
0
2.45GHz
0.5MHz/div
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
_______________________________________________________________________________________
5
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