19-1773; Rev 2; 2/03
KIT
ATION
EVALU
BLE
AVAILA
+2.8V, Single-Supply,
Cellular-Band Linear Power Amplifier
Features
o
Ultra-Compact 4
✕
4 (2.06mm
✕
2.06mm) CSP
o
High Efficiency—41% at +30dBm P
OUT
(TDMA)
(typ)
o
On-Chip Power Detector
o
I
CC
< 1µA in Shutdown Mode
o
+2.8V to +4.5V True Single-Supply Operation
o
±0.9dB Gain Variation from T
A
= -40°C to +85°C
o
Current Adjustable with PDM or DAC Signal
o
No External Logic Interface Circuitry Required
General Description
The MAX2251 low-voltage linear power amplifier (PA) is
designed for TDMA/AMPS dual-mode phone applica-
tions. The device is packaged in an ultra-compact
(2.06mm
✕
2.06mm) chip-scale package (CSP), and
delivers over +30dBm of linear power in TDMA opera-
tion. An on-chip shutdown feature reduces operating
current to 1µA (typ), eliminating the need for an external
supply switch.
The MAX2251 does not need an external reference volt-
age, and requires only a few external matching compo-
nents and no bias circuitry. Another feature of this
device is the use of external bias resistors, eliminating
wasted “safety-margin” current. This feature also allows
current throttleback at lower output power levels, there-
by maintaining the highest possible efficiency at all
power levels.
MAX2251
________________________Applications
Cellular-Band TDMA/AMPS Dual-Mode Phones
PA Modules
2-Way Pagers
Cordless Phones
PART
Ordering Information
TEMP
RANGE
PIN-
PACKAGE
TOP MARK
2251
EBE
MAX2251EBE -40°C to +85°C 4
×
4 UCSP
_ _ _ (LOT #)
_ _ _ (DATE CODE)
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
TOP VIEW
PIN A1
INDICATOR
BIAS2
GND
A2
POWER
DETECTOR
GND
A3
GND
A4
MAX2251
A1
B1
PD_OUT
BIAS1
C1
B2
GND
GND
C2
B3
OUT
V
CC
C3
B4
OUT
GND
C4
LOGIC AND
BIAS
D1
V
CC
D2
IN
D3
SHDN
D4
MODE
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+2.8V, Single-Supply,
Cellular-Band Linear Power Amplifier
MAX2251
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..........................................................-0.3V to +4.5V
SHDN,
MODE to GND ................................-0.3V to (V
CC
+ 0.3V)
BIAS_ to GND.............................................-0.3V to (V
CC
+ 0.3V)
RF Input Power ...............................................................+10dBm
Continuous Power Dissipation (T
A
= +70°C)
4
✕
4 UCSP (derate 80mW/°C above +70°C) ....................4W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Thermal Resistance from Junction to Backside.................1°C/W
Thermal Resistance from Junction to Ambient
(using MAX2251 EV kit)...............................................40°C/W
Storage Temperature Range .............................-65°C to +150°C
Bump Reflow Temperature .............................................+235°C
Continuous Operating Lifetime ...................10 yrs
✕
0.92
(T
A
- 45°C)
(At P
OUT
= +32dBm, for Operating Temperature, T
A
≥
45°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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.8V to +4.5V, no RF signal applied,
SHDN
= high, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are mea-
sured at V
CC
= +3.3V and T
A
= +25°C.)
PARAMETER
Idle Supply Current
Logic High Threshold
Logic Low Threshold
Shutdown Supply Current
Logic High Input Current
Logic Low Input Current
-1
SHDN
= MODE =
GND
V
CC
= +2.8V to +4.0V
V
CC
= +4.5V
0.6
60
MODE = high
2.0
0.8
10
120
5
+1
CONDITIONS
MIN
TYP
205
MAX
255
UNITS
mA
V
V
µA
µA
µA
2
_______________________________________________________________________________________
+2.8V, Single-Supply,
Cellular-Band Linear Power Amplifier
MAX2251
AC CHARACTERISTICS, TDMA OPERATION
(MAX2251 EV kit, f
IN
= 824MHz to 849MHz, V
CC =
V
MODE
= V
SHDN
= +3.3V, 50Ω system, NADC modulation, duty cycle = 100%,
T
A
= +25°C, unless otherwise noted. Typical values are at f
IN
= 836MHz, T
A
= +25°C.) (Note 1)
PARAMETER
Frequency Range (Note 2)
Power Gain
Extreme Condition Power Gain
Output Power
CONDITIONS
V
MODE
= V
CC
or GND
P
OUT
= +30dBm
T
A
= -40°C to +85°C, P
OUT
= +30dBm
V
CC
= +3.3V, meets ACPR
specifications
T
A
= +25
o
C
T
A
= +85°C
AMPS Output Power
Power-Added Efficiency
AMPS Power-Added Efficiency
Turn-On Time (Note 3)
Input VSWR
Maximum Nonharmonic
Spurious Due to Load
Mismatch
Noise Power
AMPS Noise Power
Harmonic Suppression (Note 4)
Power Detector Range
Power Detector Settling Time
(Note 6)
(Note 5)
C
DET
= 4700pF
27
V
CC
= +2.8V to +4.5V, all input power
levels, VSWR = 4:1 all phase angle,
T
A
= -40°C to +85°C
f
RF
= 849MHz, noise measured at
869MHz, P
OUT
= +30dBm
f
RF
= 836MHz, noise measured at
881MHz, P
OUT
= +31dBm
-121
-141
45
29.4
2
3
V
MODE
= V
CC,
P
IN
= +8dBm single tone
P
OUT
= +30dBm
P
IN
= +8dBm single tone at 836MHz
31.8
32
41.2
51
2
1.2:1
5
1.76:1
-55
dBc
dBm/
Hz
dBm/
Hz
dBc
dB
µs
MIN
824
25.7
24.8
30
-29.3/
-47.5
-28/
-48
dBm
%
%
µs
-27.4/
-45.4
-27/
-44.6
dBc
26.1
25.2
27.8
-4.5σ
TYP
4.5σ
MAX
849
UNITS
MHz
dB
dB
dBm
Adjacent/Alternate-Channel
Power Ratio
f
OFFSET
= 30/60kHz in
25kHz bandwidth
Guaranteed by design and characterization.
Operation outside the frequency range is possible, but has not been characterized.
Time when V
SHDN
transitions to V
CC
until P
OUT
is within 1dB of its final mean power.
Harmonics are measured on the MAX2251 EV kit. The output matching provides some harmonic attenuation in addition to the
rejection provided by the IC. The combined suppression is specified.
Note 5:
The range is defined by the difference between the rated linear output power and the output power that corresponds to
V
PD
= 0.57V.
Note 6:
Time from when V
SHDN
transitions high until detector output reaches within 10% of its final value.
Note 1:
Note 2:
Note 3:
Note 4:
_______________________________________________________________________________________
3
+2.8V, Single-Supply,
Cellular-Band Linear Power Amplifier
MAX2251
Typical Operating Characteristics
(MAX2251 EV kit, V
CC =
V
MODE
= V
SHDN
= +3.3V, f
IN
= 836MHz, TDMA modulation, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN vs. SUPPLY VOLTAGE
MAX2251-01
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
MAX2251-02
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
700
QUIESCENT CURRENT (mA)
600
500
400
300
200
100
0
T
A
= +25°C
T
A
= +85°C
V
MODE
= GND
NO INPUT DRIVE
MAX2251-03
40
35
SHUTDOWN CURRENT (nA)
30
25
20
15
10
5
0
2.8
V
SHDN
= V
MODE
= GND
NO INPUT DRIVE
400
350
QUIESCENT CURRENT (mA)
300
NO INPUT DRIVE
800
T
A
= +85°C
T
A
= +85°C
250
200
150
100
50
0
T
A
= -40°C
T
A
= +25°C
T
A
= +25°C
T
A
= -40°C
T
A
= -40°C
3.6
SUPPLY VOLTAGE (V)
4.5
2.8
3.6
SUPPLY VOLTAGE (V)
4.5
2.8
3.6
SUPPLY VOLTAGE (V)
4.5
SUPPLY CURRENT
vs. OUTPUT POWER
MAX2251-04
GAIN vs. OUTPUT POWER
MAX2251-05
GAIN vs. OUTPUT POWER
MAX2251-06
300
250
SUPPLY CURRENT (mA)
200
WITHOUT THROTTLEBACK
30
30
28
28
V
CC
= +2.8V
V
CC
= +4.5V
GAIN (dB)
GAIN (dB)
26
T
A
= +85°C
150
100
50
0
-10
T
A
= +25°C
T
A
= -40°C
26
V
CC
= +3.3V
WITH THROTTLEBACK (MAINTAIN
ACPR = -29dBc, ALT <-50dBc)
24
24
22
22
20
-5
0
5
10
10
15
20
25
30
OUTPUT POWER (dBm)
OUTPUT POWER (dBm)
20
10
15
20
25
30
OUTPUT POWER (dBm)
GAIN vs. FREQUENCY
MAX2251-07
GAIN vs. FREQUENCY
V
CC
= V
MODE
= V
SHDN
= +2.8V
P
OUT
= +28dBm
MAX2251-08
GAIN vs. FREQUENCY AMPS
34
32
30
V
MODE
= GND
P
OUT
= +31dBm
MAX2251-09
30
P
OUT
= +30dBm
30
28
28
GAIN (dB)
GAIN (dB)
GAIN (dB)
26
T
A
= +85°C
24
T
A
= +25°C
T
A
= -40°C
26
28
26
24
V
MODE
= V
CC
24
22
22
22
20
824
829
834
839
844
849
FREQUENCY (MHz)
20
824
829
834
839
844
849
FREQUENCY (MHz)
20
824
829
834
839
844
849
FREQUENCY (MHz)
4
_______________________________________________________________________________________
+2.8V, Single-Supply,
Cellular-Band Linear Power Amplifier
Typical Operating Characteristics (continued)
(MAX2251 EV kit, V
CC =
V
MODE
= V
SHDN
= +3.3V, f
IN
= 836MHz, TDMA modulation, T
A
= +25°C, unless otherwise noted.)
MAX2251
POWER-ADDED EFFICIENCY
vs. OUTPUT POWER
MAX2251-10
POWER-ADDED EFFICIENCY
vs. FREQUENCY
MAX2251-11
POWER-ADDED EFFICIENCY
vs. FREQUENCY, AMPS
P
OUT
= +31dBm
V
MODE
= V
CC
48
46
44
PAE (%)
42
40
38
36
V
MODE
= GND
MAX2251-12
50
45
40
35
PAE (%)
50
48
46
44
PAE (%)
42
40
38
36
34
32
30
50
P
OUT
= +30dBm
30
25
20
15
10
5
0
20
22
24
26
28
30
OUTPUT POWER (dBm)
T
A
= +85°C
T
A
= -40°C
T
A
= +25°C
V
CC
= +2.8V
P
O
= +28dBm
T
A
= +25°C
824
829
834
839
844
849
34
32
30
824
829
834
839
844
849
FREQUENCY (MHz)
FREQUENCY (MHz)
POWER-ADDED EFFICIENCY
vs. OUTPUT POWER, AMPS
MAX2251-13
ACPR/ALT vs. FREQUENCY
MAX2251-14
ACPR/ALT vs. FREQUENCY
V
SHDN
= V
CC
= +2.8V
P
OUT
= +28dBm
MAX2251-15
60
50
40
PAE (%)
30
20
10
0
20
V
MODE
= V
CC
-25
-30
-35
-40
-45
-50
-55
P
OUT
= +30dBm
ACPR
T
A
= +25°C
-25
-30
-35
-40
-45
-50
-55
ACPR/ALT (dBc)
ACPR/ALT (dBc)
ACPR
T
A
= +85°C
ACPR
ALT
T
A
= +85°C
ALT
T
A
= +25°C
ALT
22
24
26
28
30
32
824
829
834
839
844
849
824
829
834
839
844
849
OUTPUT POWER (dBm)
FREQUENCY (MHz)
FREQUENCY (MHz)
ACPR/ALT vs. OUTPUT POWER
MAX2251-16
NOISE POWER vs. FREQUENCY
P
OUT
= +30dBm
T
A
= -40°C
f
IN
= 836MHz
f
IN
= 849MHz
MAX2251-17
NOISE POWER vs. FREQUENCY AMPS
P
OUT
= +32dBm
T
A
= -40°C
MAX2251-18
-20
f
IN
=
836MHz
-25
-30
ACPR/ALT (dBc)
-35
-40
-45
-50
-55
-60
20
22
24
26
28
ALT
ACPR
-100
-110
NOISE POWER (dBm/Hz)
-120
-130
-140
-150
-160
-170
-100
-110
NOISE POWER (dBm/Hz)
-120
f
IN
= 849MHz
-130
-140
f
IN
= 836MHz
-150
-160
-170
f
IN
= 824MHz
f
IN
= 824MHz
30
869
874
879
884
889
894
869
874
879
884
889
894
OUTPUT POWER (dBm)
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
5
求职招聘
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
