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 appli-
cation, the only external components needed are a two-
element input match, input and output blocking capaci-
tors, and a V
CC
bypass capacitor.
The MAX2640/MAX2641 are designed on a high-frequen-
cy, 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
PIN-
SOFT
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
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration appears at end of data sheet.
Applications
●
●
●
●
●
●
315MHz/400MHz/900MHz/2.4GHz ISM Radios
Cellular/PCS Handsets
GPS Receivers
Cordless Phones
Wireless LANs
Wireless Data
Typical Operating Circuit
V
CC
V
CC
BIAS GENERATOR
C4
C3
MAX2640
RF OUT
Z
M2
900
—
—
—
FREQUENCY (MHz)
C2
—
1575
1900
2450
RFIN
C1
Z
M1
C2
C3
C4
C1
Z1*
ZM1
VALUE VALUE VALUE VALUE VALUE VALUE
(pF)
(pF)
(pF)
MAX2641 (pF)
(nH)
(pF)
470
100
470
470
3
100
100
100
470
470
470
470
—
—
—
100
9.85
5.6
2.55
1.65
2
1
1
1
ZM2
VALUE
—
6.8nH
1pF
1pF
Z1
RFIN
LNA
MAX2640
MAX2641
GND
RF OUT
*The series inductor Z1 can be replaced by a transmission line of appropriate impedance
and electrical length.
19-1384; Rev 4; 2/15
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Absolute Maximum Ratings
V
CC
to GND ...........................................................-0.3V to +6V
RFIN Power (50Ω source) (Note 1)
.................................+5dBm
Continuous Power Dissipation (T
A
= +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
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C (MAX2640EUT/MAX2641EUT), T
A
= -40°C to +125°C (MAX2640AUT), unless otherwise
noted. Typical values are at V
CC
= +3.0V, T
A
= +25°C.) Limits at T
A
= +25°C are guaranteed by production test. Limits over temperature
are guaranteed by design and characterization.
PARAMETER
Operating Supply Voltage
T
A
= +25°C
Operating Supply Current
T
A
= -40°C to +85°C
(MAX2640EUT/MAX2641EUT)
T
A
= -40°C to +125°C
(MAX2640AUT)
CONDITIONS
MIN
2.7
3.5
TYP
MAX
5.5
4.7
6.4
7.8
mA
UNITS
V
RF Electrical Characteristics
PARAMETER
MAX2640 (f
RFIN
= 900MHz)
RFIN Frequency Range
Gain
Gain Variation Over Temperature
Noise Figure
Input Return Loss
Output Return Loss
Reverse Isolation
Input 1dB Gain Compression Point
Input Third-Order Intercept Point
MAX2641 (f
RFIN
= 1900MHz)
RFIN Frequency Range
Gain
Gain Variation Over Temperature
Noise Figure
Input Return Loss
Output Return Loss
Reverse Isolation
Input 1dB Gain Compression Point
Input Third-Order Intercept Point
(V
CC
= +3.0V, P
RFIN
= -34dBm, Z
O
= 50Ω, T
A
= +25°C, unless otherwise noted.) (Notes 2 and 3)
CONDITIONS
MIN
300
12.8
T
A
= -40°C to +85°C (MAX2640EUT)
T
A
= -40°C to +125°C (MAX2640AUT)
(Note 4)
15.1
0.6
0.9
0.9
-11
-14
40
-22
(Note 5)
1400
12.4
T
A
= T
MIN
to T
MAX
(Note 4)
14.4
0.9
1.3
-12
-12
30
-21
(Note 6)
-4
2.4
1.5
-10
2500
1.7
2.5
1.1
TYP
MAX
1500
UNITS
MHz
dB
dB
dB
dB
dB
dB
dBm
dBm
MHz
dB
dB
dB
dB
dB
dB
dBm
dBm
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Maxim Integrated
│
2
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
RF Electrical Characteristics (continued)
PARAMETER
MAX2641 (f
RFIN
= 1575MHz)
Gain
Noise Figure
Input Return Loss
Output Return Loss
Reverse Isolation
Input 1dB Gain Compression Point
Input Third-Order Intercept Point
MAX2641 (f
RFIN
= 2450MHz)
Gain
Noise Figure
Input Return Loss
Output Return Loss
Reverse Isolation
Input 1dB Gain Compression Point
Input Third-Order Intercept Point
(Note 8)
(Note 4)
(Note 7)
(Note 4)
(V
CC
= +3.0V, P
RFIN
= -34dBm, Z
O
= 50Ω, T
A
= +25°C, unless otherwise noted.) (Notes 2 and 3)
CONDITIONS
MIN
TYP
15.7
1.2
-8
-15
-31
-21
+1.4
13.5
1.5
-10
-11
-24
-19
-2.5
MAX
UNITS
dB
dB
dB
dB
dB
dBm
dBm
dB
dB
dB
dB
dB
dBm
dBm
Note 2:
Guaranteed by design and characterization.
Note 3:
Measured using typical operating circuit. Input and output impedance matching networks were optimized for best simulta-
neous 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, f
1
= 899MHz, f
2
= 901MHz, both at -34dBm per tone.
Note 6:
Measured with two input tones, f
1
= 1899MHz, f
2
= 1901MHz, both at -34dBm per tone.
Note 7:
Measured with two input tones, f
1
= 1574MHz, f
2
= 1576MHz, both at -34dBm per tone.
Note 8:
Measured with two input tones, f
1
= 2449MHz, f
2
= 2451MHz, both at -34dBm per tone.
Typical Operating Characteristics
(V
CC
= +3V, P
RFIN
= -34dBm, Typical Operating Circuit, T
A
= +25°C, unless otherwise noted.)
MAX2640
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640-01
MAX2640-01
T
A
= -40°C
5
T
A
= +85°C
4
I
CC
(mA)
3
2
T
A
= +25°C
T
A
= -40°C
NOISE FIGURE (dB)
15
GAIN (dB)
T
A
= +25°C
14
T
A
= +85°C
2
T
A
= +85°C
1
T
A
= +25°C
T
A
= -40°C
13
1
0
12
0
2
3
4
V
CC
(V)
5
6
800
840
880
920
960
1000
800
840
880
920
960
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
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Maxim Integrated
│
3
MAX2640-03
6
16
MAX2640 MATCHED AT 900MHz
GAIN vs. FREQUENCY
3
MAX2640 MATCHED AT 900MHz
NOISE FIGURE vs. FREQUENCY
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Typical Operating Characteristics (continued)
(V
CC
= +3V, P
RFIN
= -34dBm, Typical Operating Circuit, T
A
= +25°C, unless otherwise noted.)
MAX2640-05
-7
-8
RETURN LOSS (dB)
-9
-10
-11
-12
-13
-14
-15
-16
800
OUTPUT RETURN LOSS
850
900
FREQUENCY (MHz)
950
INPUT RETURN LOSS
MAX2640-04
REVERSE ISOLATION (dB)
-10
-20
-30
-40
-50
-60
5
4
I
CC
(mA)
3
2
1
0
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
1000
800
840
880
920
960
1000
2
3
4
V
CC
(V)
5
6
FREQUENCY (MHz)
NOISE FIGURE (dB)
15
GAIN (dB)
T
A
= -40°C
MAX2640-07
2
T
A
= +85°C
14
T
A
= +85°C
13
T
A
= +25°C
T
A
= +25°C
1
T
A
= -40°C
12
1800
1840
1880
1920
1960
2000
0
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
-7
-8
RETURN LOSS (dB)
-9
-10
-11
-12
-13
-14
-15
-16
1800
1850
1900
1950
OUTPUT RETURN LOSS
INPUT RETURN LOSS
MAX2640-09
REVERSE ISOLATION (dB)
-10
-20
-30
-40
-50
-60
2000
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
FREQUENCY (MHz)
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Maxim Integrated
│
4
MAX2640-10
-6
MAX2641 MATCHED AT 1900MHz
INPUT RETURN LOSS AND
OUTPUT RETURN LOSS vs. FREQUENCY
0
MAX2641 MATCHED AT 1900MHz
REVERSE ISOLATION vs. FREQUENCY
MAX2640-08
16
MAX2641 MATCHED AT 1900MHz
GAIN vs. FREQUENCY
MAX2641 MATCHED AT 1900MHz
NOISE FIGURE vs. FREQUENCY
3
MAX2640-06
-6
MAX2640 MATCHED AT 900MHz
INPUT RETURN LOSS AND
OUTPUT RETURN LOSS vs. FREQUENCY
MAX2640 MATCHED AT 900MHz
REVERSE ISOLATION vs. FREQUENCY
0
6
MAX2641
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640/MAX2641
300MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Pin Description
IN
1
2, 3, 5
4
6
NAME
RFIN
GND
RFOUT
V
CC
FUNCTION
Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching
network (see Typical Operating Circuit).
Ground. For optimum performance, provide a low inductance connection to the ground plane.
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 ampli-
fiers 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.
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 com-
ponent count further, replace external inductors with
microstrip transmission lines. The high reverse isola-
tion 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 per-
formance. 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
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