19-1135; Rev 0; 9/96
EVALUATION PCB
AVAILABLE
DC-to-Microwave,
+5V Low-Noise Amplifier
_______________General Description
The MAX2650 is a low-noise amplifier for use from DC
to microwave frequencies. Operating from a single +5V
supply, it has a flat gain response to 900MHz. The
MAX2650’s low noise figure and high drive capability
make it ideal for a variety of transmit, receive, and
buffer applications.
The device is internally biased, eliminating the need for
external bias resistors or inductors. In a typical application, the only external components needed are input
and output blocking capacitors and a VCCbypass
capacitor.
The MAX2650 comes in a 4-pin SOT143 package,
requiring minimal board space.
________________________Applications
Wireless Local Loop
Global Positioning Systems (GPS)
ISM Radios
Special Mobile Radios
Wireless Local-Area Networks
Cellular Base Stations
Set-Top Boxes
__________Typical Operating Circuit
____________________________Features
♦ Internally Biased
♦ High Gain: 18.3dB at 900MHz
♦ 3.9dB Noise Figure
♦ Single +4.5V to +5.5V Operation
♦ -1dBm Output 1dB Compression Power
♦ Low-Cost Silicon Bipolar Design
♦ Ultra-Small SOT143 Package
______________Ordering Information
PART
MAX2650EUS-T -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
4 SOT143
__________________Pin Configuration
MAX2650
TOP VIEW
OUT
OUT
C
BLOCK
GND
MAX2650
________________________________________________________________
V
CC
IN
C
BLOCK
V
CC
C
BYP
IN
OUT
3
MAX2650
GND
21IN
SOT143
Maxim Integrated Products
V
4
CC
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
DC-to-Microwave, +5V Low-Noise Amplifier
ABSOLUTE MAXIMUM RATINGS
to GND..............................................................-0.3V to +8V
V
CC
Input Power ....................................................................+13dBm
Continuous Power Dissipation (T
SOT143-4 (derate 4mW/°C above +70°C)...................320mW
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.
MAX2650
= +70°C)
A
ELECTRICAL CHARACTERISTICS
(VCC= +5.0V, Z0= 50Ω, fIN= 900MHz, TA= +25°C, unless otherwise noted.)
(Note 1)
fIN= 100MHz to 1000MHz
fIN= 800MHz to 1000MHz
Supply Current
Note 1: Parts are designed to operate over specified temperature range. Specifications are production tested and guaranteed
at +25°C.
TA= T
MIN
VCC= 4.5V to 5.5V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
CONDITIONS
1.5:1Maximum Input Voltage Standing-Wave Ratio
1.3:1Maximum Output Voltage Standing-Wave Ratio
15.5 17.7 20.0
to T
MAX
13.0 17.7 22.0
11.0 17.7 24.0
UNITSMIN TYP MAXPARAMETER
°C-40 85Operating Temperature Range
dB16.5 18.3 21Power Gain
dBm-1Output 1dB Compression Point
dBm10Output IP3
dB3.9Noise Figure
ps300Group Delay
V4.5 5.5Supply Voltage
mA
2 _______________________________________________________________________________________
DC-to-Microwave, +5V Low-Noise Amplifier
__________________________________________Typical Operating Characteristics
(VCC= 5.0V, Z0= 50Ω, fIN= 900MHz, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
+85°C
-40°C
+25°C
4.0 6.0
4.5
VCC (V)
25
20
15
GAIN (dB)
10
5
(mA)
CC
I
40
30
20
10
0
MAX2650-01
5.55.0
GAIN vs. FREQUENCY
+25°C
OUTPUT 1dB COMPRESSION
POINT vs. FREQUENCY
5
3
1
(dBm)
-1
P
-1
-3
-5
0.1 0.3 1.5
0.5
FREQUENCY (GHz)
+85°C
-40°C
MAX2650-04
-40°C
+85°C
+25°C
1.31.10.90.7
25
20
15
GAIN (dB)
10
5
MAX2650-02
(dBm)
-1
P
GAIN vs. FREQUENCY
OUTPUT 1dB COMPRESSION
POINT vs. FREQUENCY
+5
+3
+1
-1
-3
-5
0.1 0.3 1.5
4.5V
0.5
FREQUENCY (GHz)
5.5V
4.5V
5.0V
5.5V
5.0V
MAX2650-05
1.31.10.90.7
MAX2650
MAX2650-03
0
0.1 0.3 1.5
0.5
FREQUENCY (GHz)
1.31.10.90.7
0
0.1 0.3 1.5
0.5
FREQUENCY (GHz)
1.31.10.90.7
VOLTAGE STANDING-WAVE RATIO
NOISE FIGURE vs. FREQUENCY
5
4
3
2
NOISE FIGURE (dB)
1
0
0.1 0.3 1.5
+85°C
-40°C
0.5
FREQUENCY (GHz)
+25°C
3.5:1
MAX2650-07
1.31.10.90.7
3.0:1
2.5:1
VSWR
2.0:1
1.5:1
1.0:1
0.1 0.3 1.5
vs. FREQUENCY
OUT
IN
0.5
FREQUENCY (GHz)
MAX2650-06
1.31.10.90.7
_______________________________________________________________________________________
3
DC-to-Microwave, +5V Low-Noise Amplifier
______________________________________________________________Pin Description
PIN
1
MAX2650
2 GND
3
4
NAME FUNCTION
IN
OUT
V
CC
Amplifier Input. Use a series blocking capacitor with less than 3Ω reactance at your lowest operating
frequency.
Ground Connection. For optimum performance, provide a low-inductance connection to the ground
plane.
Amplifier Output. Use a series blocking capacitor with less than 3Ω reactance at your lowest operating frequency.
Supply Connection. Bypass directly at the package pin. The value of the bypass capacitor is determined by the lowest operating frequency and is typically the same as the blocking capacitor value.
For long VCClines, additional bypassing may be necessary.
Table 1. Typical Scattering Parameters
(VCC= +5V, Z0= 50Ω, TA= +25°C.)
FREQUENCY
(GHz)
0.05
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.20
S11
(mag)
0.17
0.17
0.16
0.14
0.16
0.16
0.17
0.18
0.18
0.20
0.20
0.19
1.40 0.16 -86 13.4 4.69 31 -25.5 0.053 51 0.12 -12 2.03
1.60 0.15 -66 10.6 3.40 14 -24.4 0.060 44 0.24 -17 2.32
1.80 0.22 -40 7.4 2.35 5
2.00 0.33 -36 4.6 1.70 4 -25.3 0.055 22 0.43 -33 3.97
2.20 0.41 -38 3.1 1.43 6 -26.5 0.047 21 0.46 -33 4.85
2.40 0.44 -37 2.5 1.34 6 -28.6 0.037 22 0.49 -29 6.26
2.50 0.44 -37 2.3 1.30 4 -29.5 0.034 22 0.49 -25 7.05
S11
(ang)
-3
-6
-7
-17
-26
-39
-54
-66
-86
S21
(dB)
19.8
19.8
9
19.7
8
19.7
0
19.6
19.5
19.3
19.0
18.6
18.0
17.4
15.7
S21
(mag)
9.76
9.72
9.69
9.70
9.52
9.43
9.21
8.93
8.46
7.92
7.40
6.10
S21
(ang)
177
172
161
151
140
129
119
107
95
84
73
51
S12
(dB)
-37.8
-36.7
-35.8
-35.0
-33.8
-33.2
-32.3
-31.7
-31.1
-29.5
-28.7
-26.9
-24.4
S12
(mag)
0.013
0.015
0.016
0.018
0.020
0.022
0.024
0.026
0.028
0.033
0.037
0.045
S12
(ang)
8
14
23
28
32
34
37
41
44
48
50
52
S22
(mag)
0.42
0.39
0.37
0.35
0.32
0.28
0.25
0.21
0.17
0.13
0.10
0.05
S22
(ang)
-5
-6
-13
-19
-26
-34
-43
-53
-62
-71
-76
-49
K
3.18
2.92
2.70
2.54
2.31
2.24
2.12
2.09
2.10
1.91
1.88
1.88
0.060 32 0.35 -27 3.01
4 _______________________________________________________________________________________
DC-to-Microwave, +5V Low-Noise Amplifier
_______________Detailed Description
The MAX2650 is a broadband amplifier with flat gain
and 50Ω input and output ports. Its small size and internal bias circuitry make it ideal for applications where
board space is limited.
__________Applications Information
As shown in the
MAX2650 is easy to use. Input and output series
capacitors may be necessary to block DC bias voltages (generated by the MAX2650) 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:
C
BLOCK
where f (in MHz) is the minimum operating frequency.
The VCCpin must be RF bypassed for correct opera-
tion. To accomplish this, connect a capacitor between
the VCCpin and ground, as close to the package as is
practical. Use the same equation given above (for DC
blocking capacitor values) to calculate the minimum
capacitor value. If there are long VCClines on the PC
board, additional bypassing may be necessary. This
may be done further away from the package, at your
discretion.
Proper grounding of the GND pin is essential. If the PC
board uses a topside RF ground, the GND pin should
connect directly to it. For a board where the ground
plane is not on the component side, the best technique
is to connect the GND pin to it through multiple plated
through-holes.
External Components
Typical Operating Circuit
53,000
=
(pF)
f
, the
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. The board satisfies all the
above requirements.
RF IN
RF OUT
MAX2650
V
CC
EXPANDED VIEW
Figure 1. Example PC Board Layout
PC Board Layout Example
MAX2650
_______________________________________________________________________________________ 5
DC-to-Microwave,
DC-to-Microwave, +5V Low-Noise Amplifier
+5V Low-Noise Amplifier
________________________________________Tape-and-Reel/Marking Information
1.5 +0.1/-0.0 DIAMETER
MAX2650
2.2 ±0.1
0.5 RADIUS
TYPICAL
0.30 ±0.05
0.8 ±0.05
0.30R MAX.
4.0 ±0.1
2.0 ±0.05
4.0 ±0.1
Bo
Ao = 3.1mm ±0.1
Bo = 2.7mm ±0.1
Ko
Ko = 1.2mm ±0.1
†
ICs MAY ALSO BE MARKED WITH FULL PART NAME: MAX2650
A0
NOTE: DIMENSIONS ARE IN MM.
AND FOLLOW EIA481-1 STANDARD.
1.0 ±0.1
A
1.0 MINIMUM
A
1.75 ±0.1
3.5 ±0.05
8.0 ±0.3
MARKING
INFORMATION
X X X X
DH = MAX2650
LOT
SPECIFIC
CODE
________________________________________________________Package Information
D
0°-8°
A
A1
e1
B
I
DIM
MIN
A
0.031
A1
0.001
B
C
0.014
B1
0.030
C
0.0034
D
0.105
E
0.047
e
0.070
e1
0.071
H
0.082
I
0.004
MAX
0.047
0.005
0.022
0.038
0.006
0.120
0.055
0.080
0.079
0.098
0.012
MILLIMETERSINCHES
MIN
0.787
0.025
0.356
0.762
0.086
2.667
1.194
1.778
1.803
2.083
0.102
†
MAX
1.194
0.127
0.559
0.965
0.152
3.048
1.397
2.032
2.007
2.489
0.305
21-0052A
E
H
4-PIN SOT143
SMALL-OUTLINE
TRANSISTOR PACKAGE
B1
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
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
e
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