EVALUATION KIT AVAILABLE
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
General Description
The MAX2640/MAX2641 are low-cost, ultra-low-noise
amplifiers designed for applications in the cellular, PCS,
GPS, and 2.4GHz ISM frequency bands. Operating from
a single +2.7V to +5.5V supply, these devices consume
only 3.5mA of current while providing a low noise figure,
high gain, high input IP3, and an operating frequency
range that extends from 300MHz to 2500MHz.
The MAX2640 is optimized for 300MHz to 1500MHz
applications, with a typical performance of 15.1dB gain,
input IP3 of -10dBm, and a noise figure of 0.9dB at
900MHz. The MAX2641 is optimized for 1400MHz to
2500MHz applications, with a typical performance of
14.4dB gain, an input IP3 of -4dBm, and a noise figure of
1.3dB at 1900MHz.
These devices are internally biased, eliminating the need
for external bias resistors and chokes. In a typical application, the only external components needed are a twoelement input match, input and output blocking capacitors, and a VCC bypass capacitor.
The MAX2640/MAX2641 are designed on a high-frequency, low-noise, advanced silicon-germanium process and
are offered in the space-saving, 6-pin SOT23 package.
Features
●● Wide Operating Frequency Range
MAX2640: 300MHz to 1500MHz
MAX2641: 1400MHz to 2500MHz
●● Low Noise Figure
MAX2640: 0.9dB at 900MHz
MAX2641: 1.2dB at 1575MHz
1.3dB at 1900MHz
1.5dB at 2450MHz
●● High Gain
MAX2640: 15.1dB at 900MHz
MAX2641: 15.7dB at 1575MHz
14.4dB at 1900MHz
13.5dB at 2450MHz
●● High Reverse Isolation
MAX2640: 40dB at 900MHz
MAX2641: 31dB at 1575MHz
30dB at 1900MHz
24dB at 2450MHz
●● +2.7V to +5.5V Single-Supply Operation
●● Low 3.5mA Supply Current
●● Ultra-Small SOT23-6 Package
Ordering Information
TEMP
PINSOFT
RANGE
PACKAGE TOP MARK
MAX2640EUT-T -40°C to +85°C
6 SOT23
AAAV
MAX2640EUT+T -40°C to +85°C
6 SOT23
AAAV
MAX2640AUT+T -40°C to +125°C 6 SOT23
AAAV
MAX2641EUT-T -40°C to +85°C
6 SOT23
AAAW
MAX2641EUT+T -40°C to +125°C 6 SOT23
AAAW
PART
Applications
●●
●●
●●
●●
●●
●●
315MHz/400MHz/900MHz/2.4GHz ISM Radios
Cellular/PCS Handsets
GPS Receivers
Cordless Phones
Wireless LANs
Wireless Data
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VCC
C4
VCC
C3
RFIN
C1
ZM1
C2
Z1
RFIN
LNA
MAX2640
MAX2641
GND
19-1384; Rev 4; 2/15
C2
C3
C4
C1
Z1*
ZM1
VALUE VALUE VALUE VALUE VALUE VALUE
(pF)
(pF)
(pF)
MAX2641 (pF)
(nH)
(pF)
FREQUENCY (MHz)
BIAS GENERATOR
RF OUT
MAX2640
RF OUT
ZM2
ZM2
VALUE
900
—
470
3
470
—
9.85
2
—
—
1575
100
100
470
—
5.6
1
6.8nH
—
1900
470
100
470
—
2.55
1
1pF
—
2450
470
100
470
100
1.65
1
1pF
*The series inductor Z1 can be replaced by a transmission line of appropriate impedance
and electrical length.
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Absolute Maximum Ratings
VCC to GND ............................................................-0.3V to +6V
RFIN Power (50Ω source) (Note 1)..................................+5dBm
Continuous Power Dissipation (TA = +70°C)
SOT23-6 (derate 8.7mW/°C above +70°C)..................696mW
Operating Temperature Range
MAX2640EUT/MAX2641EUT.............................. -40°C to +85°C
MAX2640AUT.................................................... -40°C to +125°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s).................................. +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.
Note 1: Pin must be AC-coupled with a DC blocking capacitor.
CAUTION! ESD SENSITIVE DEVICE
DC Electrical Characteristics
(VCC = +2.7V to +5.5V, TA = -40°C to +85°C (MAX2640EUT/MAX2641EUT), TA = -40°C to +125°C (MAX2640AUT), unless otherwise
noted. Typical values are at VCC = +3.0V, TA = +25°C.) Limits at TA = +25°C are guaranteed by production test. Limits over temperature
are guaranteed by design and characterization.
PARAMETER
CONDITIONS
MIN
Operating Supply Voltage
2.7
TA = +25°C
Operating Supply Current
TYP
3.5
MAX
UNITS
5.5
V
4.7
TA = -40°C to +85°C
(MAX2640EUT/MAX2641EUT)
6.4
TA = -40°C to +125°C (MAX2640AUT)
7.8
mA
RF Electrical Characteristics
(VCC = +3.0V, PRFIN = -34dBm, ZO = 50Ω, TA = +25°C, unless otherwise noted.) (Notes 2 and 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1500
MHz
MAX2640 (fRFIN = 900MHz)
RFIN Frequency Range
300
Gain
12.8
Gain Variation Over Temperature
Noise Figure
15.1
dB
TA = -40°C to +85°C (MAX2640EUT)
0.6
1.7
TA = -40°C to +125°C (MAX2640AUT)
0.9
2.5
0.9
1.1
(Note 4)
dB
dB
Input Return Loss
-11
dB
Output Return Loss
-14
dB
Reverse Isolation
40
dB
Input 1dB Gain Compression Point
-22
dBm
-10
dBm
Input Third-Order Intercept Point
(Note 5)
MAX2641 (fRFIN = 1900MHz)
RFIN Frequency Range
1400
Gain
12.4
2500
14.4
MHz
dB
Gain Variation Over Temperature
TA = TMIN to TMAX
0.9
2.4
dB
Noise Figure
(Note 4)
1.3
1.5
dB
Input Return Loss
-12
dB
Output Return Loss
-12
dB
Reverse Isolation
30
dB
-21
dBm
-4
dBm
Input 1dB Gain Compression Point
Input Third-Order Intercept Point
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(Note 6)
Maxim Integrated │ 2
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
RF Electrical Characteristics (continued)
(VCC = +3.0V, PRFIN = -34dBm, ZO = 50Ω, TA = +25°C, unless otherwise noted.) (Notes 2 and 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MAX2641 (fRFIN = 1575MHz)
Gain
15.7
Noise Figure
(Note 4)
dB
1.2
dB
-8
dB
Output Return Loss
-15
dB
Reverse Isolation
-31
dB
Input 1dB Gain Compression Point
-21
dBm
+1.4
dBm
Input Return Loss
Input Third-Order Intercept Point
(Note 7)
MAX2641 (fRFIN = 2450MHz)
Gain
Noise Figure
(Note 4)
13.5
dB
1.5
dB
Input Return Loss
-10
dB
Output Return Loss
-11
dB
Reverse Isolation
-24
dB
Input 1dB Gain Compression Point
-19
dBm
-2.5
dBm
Input Third-Order Intercept Point
(Note 8)
Note 2: Guaranteed by design and characterization.
Note 3: Measured using typical operating circuit. Input and output impedance matching networks were optimized for best simultaneous gain and noise-figure performance.
Note 4: External component and circuit losses degrade noise-figure performance. Specification excludes external component and
circuit board losses.
Note 5: Measured with two input tones, f1 = 899MHz, f2 = 901MHz, both at -34dBm per tone.
Note 6: Measured with two input tones, f1 = 1899MHz, f2 = 1901MHz, both at -34dBm per tone.
Note 7: Measured with two input tones, f1 = 1574MHz, f2 = 1576MHz, both at -34dBm per tone.
Note 8: Measured with two input tones, f1 = 2449MHz, f2 = 2451MHz, both at -34dBm per tone.
Typical Operating Characteristics
(VCC = +3V, PRFIN = -34dBm, Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
MAX2640
SUPPLY CURRENT vs. SUPPLY VOLTAGE
TA = +85°C
TA = +25°C
3
TA = -40°C
NOISE FIGURE (dB)
15
GAIN (dB)
ICC (mA)
4
TA = +25°C
14
3
TA = +85°C
2
MAX2640-03
5
TA = -40°C
MAX2640-01
16
MAX2640-01
6
MAX2640 MATCHED AT 900MHz
NOISE FIGURE vs. FREQUENCY
MAX2640 MATCHED AT 900MHz
GAIN vs. FREQUENCY
TA = +85°C
2
TA = +25°C
1
13
TA = -40°C
1
0
2
3
4
VCC (V)
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5
6
12
800
840
880
920
FREQUENCY (MHz)
960
1000
0
800
840
880
920
960
1000
FREQUENCY (MHz)
Maxim Integrated │ 3
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Typical Operating Characteristics (continued)
(VCC = +3V, PRFIN = -34dBm, Typical Operating Circuit, TA = +25°C, unless otherwise noted.)
INPUT RETURN LOSS
-10
-11
-12
-13
-14
-15
5
-20
TA = +85°C
4
-30
TA = +25°C
3
-40
2
-50
1
TA = -40°C
OUTPUT RETURN LOSS
800
850
900
950
-60
1000
800
880
920
960
NOISE FIGURE (dB)
TA = +85°C
TA = +25°C
2
6
TA = +25°C
1
TA = -40°C
1800
1840
1880
1920
1960
0
2000
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX2641 MATCHED AT 1900MHz
INPUT RETURN LOSS AND
OUTPUT RETURN LOSS vs. FREQUENCY
MAX2641 MATCHED AT 1900MHz
REVERSE ISOLATION vs. FREQUENCY
REVERSE ISOLATION (dB)
-8
-9
-10
INPUT RETURN LOSS
-11
-12
-13
OUTPUT RETURN LOSS
-14
MAX2640-10
0
MAX2640-09
-7
RETURN LOSS (dB)
5
TA = +85°C
13
-10
-20
-30
-40
-50
-15
-16
4
3
MAX2640-07
14
-6
3
MAX2641 MATCHED AT 1900MHz
NOISE FIGURE vs. FREQUENCY
TA = -40°C
15
12
2
VCC (V)
MAX2641 MATCHED AT 1900MHz
GAIN vs. FREQUENCY
16
0
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
GAIN (dB)
840
MAX2640-08
-16
-10
ICC (mA)
-9
REVERSE ISOLATION (dB)
-8
6
MAX2640-06
0
MAX2641
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640-05
-7
RETURN LOSS (dB)
MAX2640 MATCHED AT 900MHz
REVERSE ISOLATION vs. FREQUENCY
MAX2640-04
-6
MAX2640 MATCHED AT 900MHz
INPUT RETURN LOSS AND
OUTPUT RETURN LOSS vs. FREQUENCY
1800
1850
1900
1950
FREQUENCY (MHz)
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2000
-60
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
Maxim Integrated │ 4
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Pin Description
IN
NAME
FUNCTION
1
RFIN
Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching
network (see Typical Operating Circuit).
2, 3, 5
GND
Ground. For optimum performance, provide a low inductance connection to the ground plane.
4
RFOUT
6
VCC
Amplifier Output. Use the recommended series blocking or matching capacitor (see Typical Operating Circuit).
Supply Voltage. Bypass to ground directly at the supply pin. The value of the bypass capacitor is determined by
the lowest operating frequency. Additional bypassing may be necessary for long VCC lines (see Typical Operating
Circuit).
Detailed Description
The MAX2640 and MAX2641 are ultra-low-noise amplifiers that operate with RF input frequency ranges
of 300MHz to 1500MHz (MAX2640) or 1400MHz to
2500MHz (MAX2641). These devices are available in
SOT23-6 packages and contain internal bias circuitry to
minimize the number of required external components.
Their small size and low external component count make
them ideal for applications where board space is limited.
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Applications Information
External Matching Components
The MAX2640/MAX2641 are easy to use, generally
requiring only five external components as shown in
the Typical Operating Circuit. To reduce external component count further, replace external inductors with
microstrip transmission lines. The high reverse isolation allows the tuning of the input matching network
without affecting the output match, and vice versa.
Select input and output matching networks to obtain the
desired combination of gain, noise figure, and return
loss performance. The Typical Operating Circuit show
the recommended input and output matching networks
for the MAX2640/MAX2641 at 900MHz and 1900MHz,
respectively. These values are optimized for best
simultaneous gain, noise figure, and return loss performance. To aid in the design of matching networks
for other frequencies, Tables 1 and 2 list typical device
S-parameters and Tables 3 and 4 list typical device noise
parameters.
Maxim Integrated │ 5
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Table 1. MAX2640 Typical Scattering Parameters at VCC = +3V, TA = +25°C
FREQUENCY
(MHz)
S11
MAG
PHASE
S21
MAG
PHASE
S12
MAG
PHASE
S22
MAG
PHASE
400
0.907
-35.1
4.62
109.1
0.001
13.5
0.302
108.4
500
0.882
-43.1
4.70
90.4
0.001
64.7
0.33
93.6
600
0.858
-50.8
4.76
70.7
0.001
55.2
0.352
81.5
700
0.832
-58.1
4.80
50.6
0.002
39.4
0.365
69.4
800
0.810
-64.9
4.85
29.5
0.004
64.2
0.384
56.8
900
0.788
-71.0
4.77
9.2
0.005
36.3
0.396
44.7
1000
0.771
-76.6
4.74
-12.0
0.007
28.0
0.412
33.5
1100
0.749
-82.3
4.55
-32.4
0.010
12.3
0.436
21.9
1200
0.735
-88.0
4.48
-53.4
0.013
-10.6
0.455
10.7
1300
0.720
-93.4
4.24
-75.9
0.015
-28.2
0.469
-0.2
1400
0.702
-98.8
4.17
-94.9
0.021
-42.9
0.482
-9.9
1500
0.688
-104.9
3.81
-117.5
0.021
-59.8
0.489
-20.2
Table 2. MAX2641 Typical Scattering Parameters at VCC = +3V, TA = +25°C
FREQUENCY
(MHz)
S11
MAG
1500
0.734
-75.5
1600
0.717
-80.3
PHASE
S21
MAG
PHASE
S12
MAG
PHASE
S22
MAG
PHASE
4.397
-90.5
4.209
-109.8
0.013
-80.3
0.535
17.7
0.016
-91.9
0.514
8.6
1700
0.695
-85.3
4.193
-131.6
0.018
-116.5
0.513
-0.5
1800
0.678
-90.6
3.876
-150.0
0.021
-128.7
0.510
-10.6
1900
0.661
-96.6
3.801
-173.5
0.023
-150.6
0.493
-21.6
2000
0.646
-102.6
3.456
166.9
0.026
-166.6
0.470
-32.0
2100
0.632
-108.8
3.302
146.4
0.028
171.7
0.431
-43.4
2200
0.620
-114.0
2.981
123.6
0.029
150.7
0.403
-56.1
2300
0.610
-119.4
2.781
105.3
0.033
132.2
0.374
-69.4
2400
0.604
-124.6
2.430
82.9
0.032
111.2
0.338
-86.2
2500
0.603
-128.4
2.118
64.7
0.030
95.7
0.316
-98.3
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Maxim Integrated │ 6
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Table 3. MAX2640 Typical Noise Parameters at VCC = +3V, TA = +25°C
FREQUENCY (MHz)
fMIN (dB)
|Γ opt|
Γ opt ANGLE
RN (Ω)
400
0.66
0.56
21
12.5
500
0.69
0.54
25
11.9
600
0.72
0.51
30
11.3
700
0.75
0.48
35
10.8
800
0.78
0.46
40
10.2
900
0.82
0.43
45
9.7
1000
0.85
0.40
50
9.3
1100
0.89
0.37
56
8.8
1200
0.93
0.35
62
8.3
1300
0.97
0.32
68
7.9
1400
1.01
0.29
77
7.4
0.26
84
7.0
1500
Table 4. MAX2641 Typical Noise Parameters at VCC = +3V, TA = +25°C
FREQUENCY (MHz)
fMIN (dB)
|Γ opt|
Γ opt ANGLE
RN (Ω)
1500
1.02
0.43
44
12.4
1600
1.05
0.40
47
11.8
1700
1.08
0.38
50
11.3
1800
1.10
0.36
54
10.8
1900
1.14
0.32
58
10.3
2000
1.17
0.30
62
9.9
2100
1.20
0.28
66
9.4
2200
1.23
0.25
71
9.0
2300
1.27
0.22
77
8.6
2300
1.30
0.19
82
8.3
2500
1.34
0.17
91
8.0
Layout and Power-Supply Bypassing
A properly designed PCB is essential to any RF/microwave circuit. Be sure to use controlled impedance lines
on all high-frequency inputs and outputs. The power
supply should be bypassed with decoupling capacitors
located close to the device VCC pins. For long VCC lines,
it may be necessary to add additional decoupling capacitors. These additional capacitors can be located further
away from the device package.
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Proper grounding of the GND pins is essential. If the
PCB uses a topside RF ground, connect it directly to all
GND pins. For a board where the ground plane is not on
the component side, the best technique is to connect the
GND pin to the board with a plated through-hole close to
the package.
Maxim Integrated │ 7
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Pin Configuration
TOP VIEW
RFIN 1
+
GND 2
MAX2640
MAX2641
GND 3
6
VCC
5
GND
4
RFOUT
SOT23-6
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
LAND PATTERN NO.
6 SOT23
U6+4
21-0058
90-0175
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Maxim Integrated │ 8
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Revision History
REVISION
NUMBER
REVISION
DATE
0
10/98
Initial release
—
1
2/99
Initial release of evaluation kit, added to data sheet
—
2
8/03
Informed customers of ESD sensitive devices
—
3
4/07
Added automotive temperature range
4
2/15
Removed automotive reference from data sheet
DESCRIPTION
PAGES
CHANGED
1, 2, 5
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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