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MAX2235EUP+

P1-P3P4-P6P7-P8
General Description
The MAX2235 low-voltage, silicon RF power amplifier
(PA) is designed for use in the 900MHz frequency band.
It operates directly from a single +2.7V to +5.5V supply,
making it suitable for use with 3-cell NiCd or 1-cell Li-Ion
batteries. The device delivers +30dBm (1W) typical out-
put power from a +3.6V supply or +28dBm from a +2.7V
supply.
The MAX2235’s gain is adjustable over a 37dB range.
A power-control pin controls gain and bias to maintain
optimum efficiency, even at lower output power levels,
thus extending the operating life of the battery. At
+30dBm output power, efficiency is typically 47%. An
additional power-saving feature is a shutdown mode
that typically reduces supply current below 1µA.
A key feature of this PA is its autoramping capability.
During turn-on and turn-off periods, the RF envelope is
controlled to approximate a raised cosine on the rising
and falling edge, thereby minimizing transient noise
and spectral splatter. The ramp time is set by selecting
the value of an external capacitor.
The MAX2235 is intended for use in constant envelope
applications such as AMPS, two-way paging, or FSK-
based communications in the 900MHz ISM band. The
device is available in a thermally enhanced 20-pin
TSSOP package with a heat slug.
Applications
900MHz ISM-Band Applications
Two-Way Pagers
Analog Cellular Phones
Microcellular GSM (Power Class 5)
Wireless Data Networks
Features
♦ 800MHz to 1000MHz Operation
♦ High Output Power at 836MHz
+32.5dBm at +5.0V
+30dBm at +3.6V
+29dBm at +3.0V
+28dBm at +2.7V
♦ +2.7V to +5.5V Single-Supply Operation
♦ Automatic Power-Up/Power-Down Ramp
♦ Direct On/Off Keying (OOK) without Intersymbol
Interference or VCO Pulling
♦ 37dB Power-Control Range
♦ 47% Efficiency
♦ <1µA Supply Current in Shutdown Mode
♦ Small 20-Pin TSSOP Package with Heat Slug
MAX2235
+3.6V, 1W Autoramping Power
Amplifier for 900MHz Applications
________________________________________________________________ Maxim Integrated Products 1
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
GC
SHDN
GND
GNDV
CC
V
CC
GND
RFIN
TOP VIEW
RFOUT
RFOUT
GND
GNDV
CC
GND
GND
V
CC
12
11
9
10
REF
RAMPGND
V
CC
MAX2235
TSSOP-EP
NOTE: THE GROUND OF THE OUTPUT STAGE IS CONNECTED TO THE
UNDERSIDE METAL SLUG.
MAX2235
SHDN
GC
RFIN
RAMP
BIAS
V
CC
V
CC
V
CC
V
CC
REF
NOTE: SOLDER UNDERSIDE OF METAL SLUG TO BOARD GND PLANE.
RFOUT
GNDGND GND
15, 16
6, 7, 102
1
11
4 3 5 8, 9
12
19
20
13, 14, 17, 18, SLUG
VGA
Functional Diagram
19-1463; Rev 2; 10/00
PART
MAX2235EUP -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
20 TSSOP-EP
EVALUATION KIT
AVAILABLE
Pin Configuration
Ordering Information
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.
MAX2235
+3.6V, 1W Autoramping Power
Amplifier for 900MHz Applications
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, GC = RAMP = REF = unconnected, no input signal applied, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at V
CC
= +3.6V and T
A
= +25°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.
V
CC
to GND...........................................................-0.3V to +6.5V
SHDN to GND.............................................-0.3V to (V
CC
+ 0.3V)
GC to GND .................................................-0.3V to (V
CC
+ 0.3V)
RF Input Power .................................................+13dBm (20mW)
Maximum Load Mismatch without Damage,
V
CC
= +2.7V to +3.4V, Any Load Phase Angle,
Any Duration.......................................................................20:1
Maximum Load Mismatch without Damage,
V
CC
= +3.4V to +5.5V, Any Load Phase Angle,
Any Duration.........................................................................8:1
Continuous Power Dissipation (T
A
= +70°C)
TSSOP (derate 80mW/°C above T
A
= +70°C) ..................6.4W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
SHDN = GND
(Note 1)
(Note 2)
V
SHDN
> 2.3V, V
GC
> 0.6V
V
SHDN
< 0.5V, V
GC
< 0.4V
2.7V < V
CC
< 3.4V, SHDN = GND,
T
A
= +55°C
V
SHDN
= 2.0V
V
SHDN
< 0.5V
CONDITIONS
0.5 100
V0.5V
IL
V2.0V
IH
SHDN Logic High
SHDN Logic Low
V2.0 2.2 2.4V
GCNOM
GC Open-Circuit Voltage
µA
-10 1.0
I
GC
GC Input Current
-0.5 0.5
I
SHDN
Shutdown Supply Current µA
2
0.5
µA
-0.5 0.5
I
INSHDN
SHDN Input Current
UNITSMIN TYP MAXSYMBOLPARAMETER
V
GC
< 0.4 mA20I
STBY
Standby Supply Current
MAX2235
+3.6V, 1W Autoramping Power
Amplifier for 900MHz Applications
_______________________________________________________________________________________ 3
Note 1: ≥ +25°C guaranteed by production test, <+25°C guaranteed by design and characterization.
Note 2: MAX guaranteed by production test, MIN guaranteed by design and characterization.
Note 3: Guaranteed by design and characterization.
Note 4: For optimum performance at a given frequency, design the output matching network for maximum output power.
Note 5: Gain is monotonic with V
GC
.
Note 6: 0.068µF capacitor from RAMP to REF. Time is measured from SHDN low-to-high transition to +29dBm output power, or
from SHDN high-to-low transition to -25dBm output power.
Note 7: Harmonics measured on the evaluation kit, which provides some harmonic attenuation in addition to the rejection provided
by the IC. The combined suppression is specified.
P
RFIN
adjusted to give P
RFOUT
= +24dBm
P
RFOUT
= +30dBm
P
RFIN
= 0dBm, V
GC
adjusted to give
P
RFOUT
= 24dBm
315
610
Average Supply Current
%47PAEPower Added Efficiency
0.6V < V
GC
< 2.3V dB37
dB24 26G
P
Power Gain
Gain-Control Range (Note 5)
mW/µs1.6dP/dt
Auto-Power Ramping-Up
Maximum Slope (Note 6)
Input VSWR relative to input impedance in
operating mode
V
CC
= 2.7V to 5.5V, 6:1 VSWR at any phase
angle
1.5:1∆VSWR
Standby Mode Input VSWR
Change
50Ω source impedance
dBc-60
Maximum Nonharmonic
Spurious Output Due to Load
Mismatch
1.5:1VSWRInput VSWR
mW/µs-1.3dP/dt
Auto-Power Ramping-Down
Minimum Slope (Note 6)
30kHz BW at offset = 45MHz dBm-90Noise Power
40 48
P
RFIN
= +7dBm dBc30 38Harmonic Suppression (Note 7)
mA
305
I
CC
P
RFIN
= 0dBm dB
25 36
Off-Isolation
V
SHDN
= 0.5V
GC = GND
AC ELECTRICAL CHARACTERISTICS
(MAX2235 Evaluation Kit, GC = unconnected, P
RFIN
adjusted to give P
RFOUT
= +30dBm, f
RFIN
= 836MHz, V
CC
= V
SHDN
= +3.6V,
T
A
= +25°C, unless otherwise noted.) (Note 3)
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
V
CC
= 2.7V 28.0
V
CC
= 3.0V, T
A
= T
MIN
to T
MAX
25.5
V
CC
= 3.0V (Note 4)
27.0 28.7
V
CC
= 3.6V
30.3
V
CC
= 5.0V
dBm
32.5
P
RFOUT
Minimum Output Power
MHz
800 1000
f
RFIN
Operational Frequency Range
(Note 4)
P1-P3P4-P6P7-P8

MAX2235EUP+

Mfr. #:
Buy MAX2235EUP+
Manufacturer:
Maxim Integrated
Description:
RF Amplifier Autoramping Power Amp for 900MHz Ap
Lifecycle:
New from this manufacturer.
Delivery:
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