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19-1384; Rev 1; 2/99
IT
TION K ET
VALUA
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E
ATA SH
OWS D
FOLL
400MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Features
o
Wide Operating Frequency Range
MAX2640: 400MHz to 1500MHz
MAX2641: 1400MHz to 2500MHz
o
Low Noise Figure
MAX2640: 0.9dB at 900MHz
MAX2641: 1.2dB at 1575MHz
1.3dB at 1900MHz
1.5dB at 2450MHz
o
High Gain
MAX2640: 15.1dB at 900MHz
MAX2641: 15.7dB at 1575MHz
14.4dB at 1900MHz
13.5dB at 2450MHz
o
High Reverse Isolation
MAX2640: 40dB at 900MHz
MAX2641: 31dB at 1575MHz
30dB at 1900MHz
24dB at 2450MHz
o
+2.7V to +5.5V Single-Supply Operation
o
Low 3.5mA Supply Current
o
Ultra-Small SOT23-6 Package
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 fig-
ure, high gain, high input IP3, and an operating fre-
quency range that extends from 400MHz to 2500MHz.
The MAX2640 is optimized for 400MHz 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
two-element input match, input and output blocking
capacitors, and a V
CC
bypass capacitor.
The MAX2640/MAX2641 are designed on a high-fre-
quency, low-noise, advanced silicon-germanium
process and are offered in the space-saving 6-pin
SOT23 package.
MAX2640/MAX2641
Applications
400MHz/900MHz/2.4GHz ISM Radios
Cellular/PCS Handsets
GPS Receivers
Cordless Phones
Wireless LANs
Wireless Data
PART
MAX2640EUT-T
MAX2641EUT-T
Ordering Information
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
SOT
TOP MARK
AAAV
AAAW
Pin Configuration appears at end of data sheet.
Typical Operating Circuits
V
CC
V
CC
BIAS GENERATOR
RFIN
C1
Z1
RFIN
Z
M1
LNA
RF OUT
C2
RF OUT
Z
M2
C4
C3
C2
C3
C4
C1
VALUE VALUE VALUE VALUE
(pF)
(pF)
(pF)
MAX2640 MAX2641 (pF)
FREQUENCY (MHz)
900
—
—
—
GND
—
1575
1900
2450
470
100
470
470
3
100
100
100
470
470
470
470
—
—
—
100
Z1*
ZM1
VALUE VALUE
(nH)
(pF)
9.85
5.6
2.55
1.65
2
1
1
1
ZM2
VALUE
—
6.8nH
1pF
1pF
MAX2640/1
*The series inductor Z1 can be replaced by a transmission line of appropriate impedance
and electrical length.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
400MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
MAX2640/MAX2641
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 ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +160°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.
Note 1:
Pin must be AC-coupled with a DC blocking capacitor.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical values are at V
CC
= +3.0V, T
A
= +25°C.)
PARAMETER
Operating Supply Voltage
Operating Supply Current
T
A
= +25°C
T
A
= -40°C to +85°C
CONDITIONS
MIN
2.7
3.5
TYP
MAX
5.5
4.7
6.4
UNITS
V
mA
RF ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V, P
RFIN
= -34dBm, Z
O
= 50Ω, T
A
= +25°C, unless otherwise noted.) (Notes 2 and 3)
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
(Note 6)
T
A
= T
MIN
to T
MAX
(Note 4)
1400
12.4
14.4
0.9
1.3
-12
-12
30
-21
-4
2.4
1.5
2500
MHz
dB
dB
dB
dB
dB
dB
dBm
dBm
(Note 5)
T
A
= T
MIN
to T
MAX
(Note 4)
400
12.8
15.1
0.6
0.9
-11
-14
40
-22
-10
1.7
1.1
1500
MHz
dB
dB
dB
dB
dB
dB
dBm
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
400MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
RF ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V, P
RFIN
= -34dBm, Z
O
= 50Ω, T
A
= +25°C, unless otherwise noted.) (Notes 2 and 3)
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)
13.5
1.5
-10
-11
-24
-19
-2.5
dB
dB
dB
dB
dB
dBm
dBm
(Note 7)
(Note 4)
15.7
1.2
-8
-15
-31
-21
+1.4
dB
dB
dB
dB
dB
dBm
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
MAX2640/MAX2641
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 Circuits, T
A
= +25°C, unless otherwise noted.)
MAX2640
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640-01
MAX2640 MATCHED AT 900MHz
GAIN vs. FREQUENCY
T
A
= -40°C
15
GAIN (dB)
T
A
= +25°C
14
T
A
= +85°C
MAX2640-01
MAX2640 MATCHED AT 900MHz
NOISE FIGURE vs. FREQUENCY
MAX2640-03
6
5
T
A
= +85°C
4
I
CC
(mA)
3
2
T
A
= +25°C
T
A
= -40°C
16
3
NOISE FIGURE (dB)
2
T
A
= +85°C
T
A
= +25°C
1
T
A
= -40°C
13
1
0
2
3
4
V
CC
(V)
5
6
12
800
840
880
920
960
1000
FREQUENCY (MHz)
0
800
840
880
920
960
1000
FREQUENCY (MHz)
_______________________________________________________________________________________
3
400MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
MAX2640/MAX2641
Typical Operating Characteristics (continued)
(V
CC
= +3V, P
RFIN
= -34dBm, Typical Operating Circuits, T
A
= +25°C, unless otherwise noted.)
MAX2640 MATCHED AT 900MHz
INPUT RETURN LOSS AND
OUTPUT RETURN LOSS vs. FREQUENCY
MAX2640-04
MAX2640 MATCHED AT 900MHz
REVERSE ISOLATION vs. FREQUENCY
MAX2640-05
MAX2641
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640-06
-6
-7
-8
0
-10
REVERSE ISOLATION (dB)
-20
-30
-40
-50
6
5
T
A
= +85°C
4
I
CC
(mA)
T
A
= +25°C
3
2
1
0
T
A
= -40°C
RETURN LOSS (dB)
-9
-10
-11
-12
-13
-14
-15
-16
800
850
INPUT RETURN LOSS
OUTPUT RETURN LOSS
-60
900
FREQUENCY (MHz)
950
1000
800
840
880
920
960
1000
FREQUENCY (MHz)
2
3
4
V
CC
(V)
5
6
MAX2641 MATCHED AT 1900MHz
GAIN vs. FREQUENCY
MAX2640-07
MAX2641 MATCHED AT 1900MHz
NOISE FIGURE vs. FREQUENCY
MAX2640-08
16
T
A
= -40°C
15
GAIN (dB)
3
NOISE FIGURE (dB)
T
A
= +85°C
2
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
FREQUENCY (MHz)
0
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
MAX2641 MATCHED AT 1900MHz
INPUT RETURN LOSS AND
OUTPUT RETURN LOSS vs. FREQUENCY
MAX2640-09
MAX2641 MATCHED AT 1900MHz
REVERSE ISOLATION vs. FREQUENCY
MAX2640-10
-6
-7
-8
RETURN LOSS (dB)
-9
-10
-11
-12
-13
-14
-15
-16
1800
1850
1900
FREQUENCY (MHz)
1950
OUTPUT RETURN LOSS
INPUT RETURN LOSS
0
-10
REVERSE ISOLATION (dB)
-20
-30
-40
-50
-60
2000
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
4
_______________________________________________________________________________________
400MHz to 2500MHz SiGe
Ultra-Low-Noise Amplifiers
Pin Description
PIN
1
2, 3, 5
4
NAME
RFIN
GND
RFOUT
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 deter-
mined by the lowest operating frequency. Additional bypassing may be necessary for long V
CC
lines (see
Typical Operating Circuit).
MAX2640/MAX2641
6
V
CC
Detailed Description
The MAX2640 and MAX2641 are ultra-low-noise ampli-
fiers that operate with RF input frequency ranges of
400MHz 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 compo-
nent 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 per-
formance. The
Typical Operating Circuits
show the rec-
ommended 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 perfor-
mance. 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.
_______________________________________________________________________________________
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