MAXIM MAX2650

19-1135; Rev 0; 9/96
B
PC
ATION
EVALU ABLE
AVAIL
DC-to-Microwave,
+5V Low-Noise Amplifier
____________________________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
________________________Applications
Wireless Local Loop
______________Ordering Information
Global Positioning Systems (GPS)
ISM Radios
PART
TEMP. RANGE
PIN-PACKAGE
MAX2650EUS-T
-40°C to +85°C
4 SOT143
Special Mobile Radios
Wireless Local-Area Networks
Cellular Base Stations
Set-Top Boxes
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
VCC
OUT
OUT
CBLOCK
VCC
OUT
4 VCC
3
CBYP
MAX2650
IN
GND
MAX2650
IN
GND
2
1 IN
CBLOCK
SOT143
________________________________________________________________ Maxim Integrated Products
1
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MAX2650
_______________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 V CC bypass
capacitor.
The MAX2650 comes in a 4-pin SOT143 package,
requiring minimal board space.
MAX2650
DC-to-Microwave, +5V Low-Noise Amplifier
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +8V
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, 10sec) .............................+300°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.
ELECTRICAL CHARACTERISTICS
(VCC = +5.0V, Z0 = 50Ω, fIN = 900MHz, TA = +25°C, unless otherwise noted.)
PARAMETER
Operating Temperature Range
CONDITIONS
(Note 1)
Power Gain
MIN
TYP
MAX
-40
16.5
18.3
UNITS
85
°C
21
dB
Output 1dB Compression Point
-1
dBm
Output IP3
10
dBm
Noise Figure
3.9
dB
Maximum Input Voltage Standing-Wave Ratio
fIN = 100MHz to 1000MHz
1.5:1
Maximum Output Voltage Standing-Wave Ratio
fIN = 800MHz to 1000MHz
1.3:1
Group Delay
300
Supply Voltage
Supply Current
4.5
ps
5.5
15.5
17.7
20.0
TA = TMIN to TMAX
13.0
17.7
22.0
VCC = 4.5V to 5.5V
11.0
17.7
24.0
V
mA
Note 1: Parts are designed to operate over specified temperature range. Specifications are production tested and guaranteed
at +25°C.
2
_______________________________________________________________________________________
DC-to-Microwave, +5V Low-Noise Amplifier
OUTPUT 1dB COMPRESSION
POINT vs. FREQUENCY
+5
MAX2650-02
5
MAX2650-01
40
OUTPUT 1dB COMPRESSION
POINT vs. FREQUENCY
3
+3
20
P-1 (dBm)
P-1 (dBm)
+85°C
1
+85°C
-1
5.5V
+1
5.0V
-1
-40°C
4.5V
10
-40°C
-3
+25°C
-3
+25°C
-5
4.5
5.0
-5
0.1
6.0
5.5
0.3
0.5
0.7
0.9
1.1
1.3
1.5
0.1
0.3
0.5
FREQUENCY (GHz)
VCC (V)
MAX2650-04
25
1.1
1.3
1.5
5.5V
20
GAIN (dB)
15
0.9
GAIN vs. FREQUENCY
+85°C
20
0.7
FREQUENCY (GHz)
GAIN vs. FREQUENCY
25
GAIN (dB)
+25°C
-40°C
10
15
4.5V
10
5.0V
5
5
0
0
0.3
0.5
0.7
0.9
1.1
1.3
0.1
1.5
0.3
0.5
0.7
0.9
1.1
1.3
FREQUENCY (GHz)
FREQUENCY (GHz)
NOISE FIGURE vs. FREQUENCY
VOLTAGE STANDING-WAVE RATIO
vs. FREQUENCY
5
3.5:1
+85°C
3
3.0:1
+25°C
VSWR
4
1.5
MAX2650-06
0.1
MAX2650-07
4.0
MAX2650-05
0
NOISE FIGURE (dB)
ICC (mA)
30
MAX2650-03
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
-40°C
2.5:1
2
2.0:1
1
1.5:1
OUT
IN
1.0:1
0
0.1
0.3
0.5
0.7
0.9
1.1
FREQUENCY (GHz)
1.3
1.5
0.1
0.3
0.5
0.7
0.9
1.1
1.3
1.5
FREQUENCY (GHz)
_______________________________________________________________________________________
3
MAX2650
__________________________________________Typical Operating Characteristics
(VCC = 5.0V, Z0 = 50Ω, fIN = 900MHz, TA = +25°C, unless otherwise noted.)
MAX2650
DC-to-Microwave, +5V Low-Noise Amplifier
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
IN
Amplifier Input. Use a series blocking capacitor with less than 3Ω reactance at your lowest operating
frequency.
2
GND
Ground Connection. For optimum performance, provide a low-inductance connection to the ground
plane.
3
OUT
Amplifier Output. Use a series blocking capacitor with less than 3Ω reactance at your lowest operating frequency.
4
VCC
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 VCC lines, additional bypassing may be necessary.
Table 1. Typical Scattering Parameters
(VCC = +5V, Z0 = 50Ω, TA = +25°C.)
FREQUENCY
(GHz)
4
S11
(mag)
S11
(ang)
S21
(dB)
S21
(mag)
S21
(ang)
S12
(dB)
S12
(mag)
S12
(ang)
S22
(mag)
S22
(ang)
K
0.05
0.17
-3
19.8
9.76
177
-37.8
0.013
8
0.42
-5
3.18
0.10
0.17
-6
19.8
9.72
172
-36.7
0.015
14
0.39
-6
2.92
0.20
0.16
9
19.7
9.69
161
-35.8
0.016
23
0.37
-13
2.70
0.30
0.14
8
19.7
9.70
151
-35.0
0.018
28
0.35
-19
2.54
0.40
0.16
0
19.6
9.52
140
-33.8
0.020
32
0.32
-26
2.31
0.50
0.16
-7
19.5
9.43
129
-33.2
0.022
34
0.28
-34
2.24
0.60
0.17
-17
19.3
9.21
119
-32.3
0.024
37
0.25
-43
2.12
0.70
0.18
-26
19.0
8.93
107
-31.7
0.026
41
0.21
-53
2.09
0.80
0.18
-39
18.6
8.46
95
-31.1
0.028
44
0.17
-62
2.10
0.90
0.20
-54
18.0
7.92
84
-29.5
0.033
48
0.13
-71
1.91
1.00
0.20
-66
17.4
7.40
73
-28.7
0.037
50
0.10
-76
1.88
1.20
0.19
-86
15.7
6.10
51
-26.9
0.045
52
0.05
-49
1.88
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
-24.4
0.060
32
0.35
-27
3.01
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
_______________________________________________________________________________________
DC-to-Microwave, +5V Low-Noise Amplifier
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. The board satisfies all the
above requirements.
__________Applications Information
External Components
As shown in the Typical Operating Circuit , 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:
CBLOCK =
53,000
RF IN
RF OUT
(pF)
f
where f (in MHz) is the minimum operating frequency.
The VCC pin must be RF bypassed for correct operation. To accomplish this, connect a capacitor between
the VCC pin 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 VCC lines 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.
MAX2650
VCC
EXPANDED VIEW
Figure 1. Example PC Board Layout
_______________________________________________________________________________________
5
MAX2650
_______________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.
MAX2650
DC-to-Microwave, +5V Low-Noise Amplifier
+5V Low-Noise Amplifier
________________________________________Tape-and-Reel/Marking Information
4.0 ±0.1
1.0 ±0.1
1.75 ±0.1
2.0 ±0.05
1.5 +0.1/-0.0 DIAMETER
A
3.5 ±0.05
8.0 ±0.3
2.2 ±0.1
0.5 RADIUS
TYPICAL
A0
4.0 ±0.1
1.0 MINIMUM
A
Bo
Ko
0.30 ±0.05
0.8 ±0.05
0.30R MAX.
MARKING
INFORMATION †
LOT
SPECIFIC
XX XX
CODE
Ao = 3.1mm ±0.1
Bo = 2.7mm ±0.1
Ko = 1.2mm ±0.1
DH = MAX2650
NOTE: DIMENSIONS ARE IN MM.
AND FOLLOW EIA481-1 STANDARD.
† ICs MAY ALSO BE MARKED WITH FULL PART NAME: MAX2650
________________________________________________________Package Information
DIM
D
0°-8°
A
C
I
A1
e1
B
A
A1
B
B1
C
D
E
e
e1
H
I
INCHES
MIN
MAX
0.031
0.001
0.014
0.030
0.0034
0.105
0.047
0.070
0.071
0.082
0.004
0.047
0.005
0.022
0.038
0.006
0.120
0.055
0.080
0.079
0.098
0.012
MILLIMETERS
MAX
MIN
0.787
0.025
0.356
0.762
0.086
2.667
1.194
1.778
1.803
2.083
0.102
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
e
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.