_______________General Description
The MAX2611 is a low-voltage, low-noise amplifier for
use from DC to microwave frequencies. Operating from
a single +5V supply, it has a 3dB bandwidth of
1100MHz. The MAX2611’s low noise figure and high
drive capability make it ideal for a variety of transmit,
receive, and buffer applications.
In a typical application, the only external components
needed are input and output blocking capacitors and
a VCC series resistor. To improve gain and output
power, an RF choke can be added in series to the bias
resistor.
The MAX2611 comes in a 4-pin SOT143 package,
requiring minimal board space.
________________________Applications
Satellite Receivers
TV Tuners
Wireless Local Loops
ISM Radios
Global Positioning Systems
Wireless Local-Area Networks
Land Mobile Radios
Set-Top Boxes
____________________________Features
♦Single +5V Supply Operation
♦3dB Bandwidth: DC to 1100MHz
♦High Gain: 18dB at 500MHz
♦Low Noise Figure: 3.5dB at 500MHz
♦High Drive Capability: +3dBm at 16mA ID
♦Ultra-Small SOT143 Package
MAX2611
DC-to-Microwave, Low-Noise Amplifier
________________________________________________________________ Maxim Integrated Products 1
OUT GND
GND
14
23IN
SOT143
TOP VIEW
MAX2611
__________________Pin Configuration
VCC
CBYP
(OPTIONAL)
RBIAS
CBLOCK
OUT
LCHOKE
(OPTIONAL)
OUT
GND
GND
IN
CBLOCK
IN
MAX2611
__________Typical Operating Circuit
19-1094; Rev 2; 4/05
PART
MAX2611EUS-T -40°C to +85°C
TEMP RANGE PIN-PACKAGE
4 SOT143-4
EVALUATION KIT
AVAILABLE
________________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.
MAX2611
DC-to-Microwave, Low-Noise Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(ID= 16mA, Z0= 50Ω, fIN = 500MHz, TA= +25°C, unless otherwise noted.)
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.
Note 1: Parts are designed to operate over specified temperature range. Specifications are production tested and guaranteed
at +25°C.
Note 2: Guaranteed by design, not tested.
ID.........................................................................................40mA
Input Power ....................................................................+13dBm
Continuous Power Dissipation (TA= +70°C)
SOT143-4 (derate 4mW/°C above +70°C)..................320mW
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
fIN = 100MHz to 500MHz
fIN = 100MHz
(Note 1)
fIN = 100MHz to 1500MHz
fIN = 100MHz to 1500MHz
CONDITIONS
mV/°C-6.1
Device Voltage
Temperature Coefficient
dB±0.3Gain Flatness
dB
19.0
°C-40 85Operating Temperature Range
Power Gain
ps210Group Delay
dBm13Output IP3
dB3.5Noise Figure
MHz11003dB Bandwidth
1.9:1
Input Voltage Standing-Wave
Maximum Ratio
1.6:1
Output Voltage Standing-Wave
Maximum Ratio
dBm2.9Output 1dB Compression Point
UNITSMIN TYP MAXPARAMETER
fIN = 500MHz 17.3 18.3
TA= TMIN to TMAX (Note 2) 3.25 3.8 4.26
Device Voltage V
3.5 3.8 4.0
CAUTION! ESD SENSITIVE DEVICE
MAX2611
DC-to-Microwave, Low-Noise Amplifier
_______________________________________________________________________________________ 3
25
0
0.05 0.10 0.30 0.50 1.00
GAIN vs. FREQUENCY
5
10
20
MAX2611-01
FREQUENCY (GHz)
GAIN (dB)
3.00 6.00
15
TA = -40°C
TA = +85°C
5:1
1:1
0.05 0.10 0.30 0.50 1.00
VOLTAGE STANDING-WAVE RATIO
vs. FREQUENCY
2:1
3:1
4:1
MAX2611-02
FREQUENCY (GHz)
VSWR
3.00 6.00
IN
OUT
5
0
0.1 0.2 0.3 0.4 0.5
OUTPUT 1dB COMPRESSION
POINT vs. FREQUENCY
1
2
4
MAX2611-03
FREQUENCY (GHz)
P-1 (dBm)
1.0 2.0
3
TA = -40°C
TA = +85°C
TA = +25°C
7
2
0.1 0.2 0.3 0.4 0.5
NOISE FIGURE vs. FREQUENCY
3
4
6
MAX2611-04
FREQUENCY (GHz)
NOISE FIGURE (dB)
1.0 2.0
5
TA = -40°C
TA = +25°C
TA = +85°C
25
0
10 15 20 25
GAIN vs. CURRENT
5
10
20
MAX2611-05
ID(mA)
GAIN (dB)
30 35
15
0.16GHz
0.5GHz
2.0GHz
1.0GHz
__________________________________________Typical Operating Characteristics
(ID = 16mA, Z0= 50Ω, fIN = 500MHz, TA= +25°C, unless otherwise noted.)
MAX2611
DC-to-Microwave, Low-Noise Amplifier
4 _______________________________________________________________________________________
______________________________________________________________Pin Description
NAME FUNCTION
1OUT Amplifier Output. Use a series blocking capacitor with less than 3Ωreactance at your lowest operat-
ing frequency. Bias with an external resistor and an optional RF choke.
2, 4 GND Ground Connection. For optimum performance, provide a low-inductance connection to the ground
plane.
PIN
3IN Amplifier Input. Use a series blocking capacitor with less than 3Ωreactance at your lowest operating
frequency.
Table 1. Typical Scattering Parameters
(ID= 16mA, Z0= 50Ω, TA= +25°C)
3.0
0.3
0.2
0.1
2.5
2.0
1.5
1.0
0.4
0.5
0.6
0.8
FREQUENCY
(GHz)
0.20
0.32
0.31
0.32
0.12
0.13
0.15
0.15
0.14
0.13
0.11
0.12
S11
(mag)
-70
-76
-72
-60
16
50
77
-89
-78
-58
-44
-11
S11
(ang)
5.9
7.9
10.3
14.1
16.6
17.4
18.1
18.3
18.5
18.6
18.8
19.0
S21
(dB)
1.98
2.48
3.27
5.07
6.79
7.45
7.99
8.26
8.43
8.53
8.73
8.90
S21
(mag)
32
47
59
79
109
123
137
144
151
158
166
173
S21
(ang)
-22.3
-22.6
-22.2
-21.8
-20.9
-21.6
-21.6
-21.6
-21.6
-21.6
-21.9
-22.6
S12
(dB)
0.077
0.074
0.078
0.081
0.090
0.083
0.083
0.083
0.083
0.083
0.081
0.074
S12
(mag)
37
25
18
11
10
10
9
7
6
5
4
2
S12
(ang)
0.24
0.26
0.22
0.21
0.10
0.10
0.09
0.08
0.06
0.04
0.03
0.05
S22
(mag)
-29
-53
-72
-86
35
23
26
34
32
45
12
53
S22
(ang)
3.10
2.44
1.87
1.29
1.11
1.10
1.07
1.06
1.06
1.05
1.06
1.08
K
3.5 0.24 -64 3.0 1.41 13 -21.4 0.086 30 0.19 47 3.83
4.0 0.31 -68 -0.7 0.92 17 -23.0 0.070 35 0.24 82 6.66
MAX2611
DC-to-Microwave, Low-Noise Amplifier
_______________________________________________________________________________________ 5
_______________Detailed Description
The MAX2611 is a broadband amplifier with flat gain
and 50Ωinput and output ports. Its small size and sim-
ple bias circuitry make it ideal for applications where
board space is limited.
__________Applications Information
External Components
As shown in the Typical Operating Circuit, the
MAX2611 is easy to use. Input and output series
capacitors may be necessary to block DC bias volt-
ages (generated by the MAX2611) from interacting with
adjacent circuitry. These capacitors must be large
enough to contribute negligible reactance in a 50Ω
system at the minimum operating frequency. Use the
following equation to calculate their minimum value:
where f (in MHz) is the minimum operating frequency.
Bias current is supplied to the MAX2611 through an
external resistor and optional RF choke connected
between VCC and the OUT pin. A bypass capacitor
from VCC to GND may be necessary to isolate the VCC
line from other circuitry. The resistor value determines
the bias current from the following equation:
where VDis the device voltage, nominally 3.8V.
An optional RF choke can be added to improve the
MAX2611’s gain and output power. The choke should
be large enough to reduce the loading effect that the
bias resistor has on the amplifier output. This is a func-
tion of RBIAS, frequency of operation, and output
impedance.
Grounding
Proper grounding of the GND pins is essential. If the
PC board uses a topside RF ground, the GND pins
should be connected directly to it. For a board where
the ground plane is not on the component side, the
best technique is to connect the GND pins to it through
multiple plated through-holes.
PC Board Layout Example
An example PC board layout is given in Figure 1. It
uses FR-4 with 31mil layer thickness between the RF
lines and the ground plane. This board satisfies all the
above requirements.
ID = VCC - VD
RBIAS
CBLOCK = 53,000
f
(pF)
Figure 1. Example PC Board Layout
EXPANDED VIEW
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
MAX2611
DC-to-Microwave, Low-Noise Amplifier
SOT-143 4L.EPS
E
1
1
21-0052
PACKAGE OUTLINE, SOT-143, 4L
4.0 ±0.1
0.30 ±0.05
0.8 ±0.05
0.30R MAX.
Bo
Ko
2.2 ±0.1
0.5 RADIUS
TYPICAL A0
4.0 ±0.1
2.0 ±0.05
1.5 +0.1/-0.0 DIAMETER 1.75 ±0.1
1.0 ±0.1
A
8.0 ±0.3
3.5 ±0.05
1.0 MINIMUM
A
DF = MAX2611
Ao = 3.1mm ±0.1
Bo = 2.7mm ±0.1
Ko = 1.2mm ±0.1
X X X X
LOT SPECIFIC
CODE
MARKING
INFORMATION
NOTE: DIMENSIONS ARE IN MM.
AND FOLLOW EIA481-1 STANDARD.
ICs MAY ALSO BE MARKED WITH FULL PART NAME: 2611
†
†
__________________________________________________Tape-and-Reel Information
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
