19-1682; Rev 0; 4/00
UAL
IT MAN
TION K
A
SHEET
EVALU
S DATA
W
FOLLO
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Features
o
Wide Frequency Range: 800MHz to 1000MHz
o
High Output IP3 and Adjustable
+17dBm at 5.3mA
+7dBm at 2.8mA
o
Low Noise Figure: 1.3dB at 900MHz
o
13dB Attenuation Step (MAX2642)
o
On-Chip Output Matching
o
Low-Power Shutdown Mode
o
+2.7V to +5.5V Single-Supply Operation
o
Ultra-Small SC70-6 Package
General Description
The MAX2642/MAX2643 low-cost, high third-order inter-
cept point (IP3), low-noise amplifiers (LNAs) are
designed for applications in cellular, ISM, SMR, and
PMR systems. They feature a programmable bias,
allowing the IP3 and supply current to be optimized for
specific applications. These LNAs provide up to 0dBm
input IP3 while maintaining a low noise figure of 1.3dB.
The gain for these devices is typically 17dB. The
MAX2642 also features a 13dB attenuation step, which
extends the LNA’s dynamic range. Both devices feature
a shutdown mode that minimizes power consumption.
On-chip output matching saves board space by reduc-
ing the number of external components.
The MAX2642/MAX2643 are designed on a low-noise,
advanced silicon-germanium (SiGe) process technolo-
gy. They operate from a +2.7V to +5.5V single supply
and are available in the ultra-small 6-pin SC70 package.
MAX2642/MAX2643
________________________Applications
800MHz/900MHz Cellular Phones
900MHz Cordless Phones
868MHz/900MHz ISM-Band Wireless Data
PMR/SMR/LMR
MAX2642EXT-T
MAX2643EXT-T
PART
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SC70-6
6 SC70-6
TOP
MARK
AAC
AAD
Typical Operating Circuit
V
CC
47pF
Pin Configuration
V
CC
LOW GAIN
(ENABLE)
BIAS
BIAS
MAX2642
MAX2643
TOP VIEW
R
BIAS
510Ω
BIAS
1
HIGH GAIN
(SHUTDOWN)
6
RFOUT
GND
2
L1
8.7nH
C1
3.3pF
33k
(10k)
RFIN
RFOUT
RF
OUTPUT
MAX2642
MAX2643
5
GND
RF
INPUT
RFIN
3
4
V
CC
SC70-6
GND
( ) ARE FOR MAX2643.
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
900MHz SiGe, High IP3,
Low-Noise Amplifiers
MAX2642/MAX2643
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
RFOUT to GND...........................................-0.3V to (V
CC
+ 0.3V)
RFIN to GND ..................................................................0 to 0.9V
RFIN Power (50Ω source) ................................................+5dBm
BIAS to GND ................................................................0 to +0.3V
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Continuous Power Dissipation (T
A
= +70°C)
SC70-6 (derate 3.1mW/°C above +70°C) ...................245mW
Storage Temperature Range .............................-65°C to +150°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.
DC ELECTRICAL CHARACTERISTICS—MAX2642
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50Ω, high-
gain mode. Typical values are at V
CC
= 3.0V, T
A
= +25°C, unless otherwise noted.) (Notes 1, 2, 3)
PARAMETER
Supply Voltage
CONDITIONS
High-gain mode, R
BIAS
= 510Ω, T
A
= +25°C
R
BIAS
= 510Ω, T
A
= -40°C to +85°C
MIN
2.7
TYP
5.3
3.6
2.8
5.9
0.2
MAX
5.5
6.7
7.5
UNITS
V
Operating Supply Current
R
BIAS
= 806Ω
R
BIAS
= 1.1kΩ
Low-gain mode, R
BIAS
= 510Ω, T
A
= 25°C
mA
Shutdown Supply Current
Gain Control Voltage Input
Gain Control Input Current
BIAS = unconnected (see
Applications Information)
High-gain mode (Note 4)
Low-gain mode (Note 5)
High-gain mode (Note 6)
Low-gain mode (Note 7)
2.0
-10
0
mA
0.6
0
50
V
µA
DC ELECTRICAL CHARACTERISTICS—MAX2643
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50Ω. Typical
values are at V
CC
= 3.0V, T
A
= +25°C, unless otherwise noted.) (Notes 1, 8, 9)
PARAMETER
Supply Voltage
CONDITIONS
R
BIAS
= 510Ω, T
A
= +25°C
MIN
2.7
TYP
5.1
3.4
2.6
0.2
MAX
5.5
6.5
7.3
UNITS
V
Operating Supply Current
R
BIAS
= 510Ω, T
A
= -40°C to +85°C
R
BIAS
= 806Ω
R
BIAS
= 1.1kΩ
Shutdown mode (see
Applications Information)
Normal operation (Note 10)
Shutdown mode (Note 11)
Normal operation (Note 7)
Shutdown mode (Note 6)
2.0
0
-5
mA
Shutdown Supply Current
Shutdown Control Input Voltage
Shutdown Control Input Current
10
0.6
10
5
µA
V
µA
2
_______________________________________________________________________________________
900MHz SiGe, High IP3,
Low-Noise Amplifiers
AC ELECTRICAL CHARACTERISTICS
(MAX2642/MAX2643 EV kits, P
RFIN
= -30dBm, f
RFIN
= 900MHz, input and output are terminated to 50Ω, V
CC
= +3.0V, T
A
= +25°C,
R
BIAS
= 510Ω, unless otherwise noted.) (Note 12)
MAX2642/MAX2643
PARAMETER
Operating Frequency Range
Gain (Note 14)
Gain Variation Over Temperature
Attenuation Step
Input Third-Order Intercept Point
(Note 15)
Input 1dB Compression Point
Noise Figure (Note 16)
Input Return Loss
Output Return Loss
Reverse Isolation
Gain-Step Response Time
Shutdown Response Time
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Note 15:
Note 16:
CONDITIONS
(Note 13)
T
A
= +25°C
T
A
= -40°C to +85°C
MAX2642 only
R
BIAS
= 510Ω
R
BIAS
= 806Ω
R
BIAS
= 1.1kΩ
MAX2642, low-gain mode
MAX2642, low-gain mode
MIN
800
14.5
TYP
16.7
±0.35
13
0
-5
-10
-18
-17
1.35
4.3
MAX
1000
19
±0.75
UNITS
MHz
dB
dB
dB
dBm
dBm
1.6
dB
dB
dB
dB
10
10
µs
µs
-10
MAX2642, low-gain mode
MAX2642, low-gain mode
MAX2642, low-gain mode
MAX2642
MAX2643
MAX2642, through series switch at BIAS
-10
-10
-10
-20
-10
-12
-18
-14
-11
-26
-17
5
6
12
Devices are production tested at T
A
= +25°C. Minimum and maximum values are guaranteed by design and characterization
over temperature and supply voltage.
High-gain mode is set for the MAX2642 by connecting RFOUT to GND through a 33kΩ resistor.
Low-gain mode is applicable only to the MAX2642 and is set by connecting RFOUT to V
CC
through a 33kΩ resistor.
Maximum DC voltage through a 33kΩ resistor that sets the MAX2642 to operate in high-gain mode.
Minimum DC voltage through a 33kΩ resistor that sets the MAX2642 to operate in low-gain mode.
DC current required when RFOUT is connected to GND through a 33kΩ resistor (MAX2642) and 10kΩ resistor (MAX2643).
DC current required when RFOUT is connected to V
CC
through a 33kΩ resistor (MAX2642) and 10kΩ resistor (MAX2643).
Normal operation is set for the MAX2643 by connecting RFOUT to V
CC
through a 10kΩ resistor.
Shutdown is set for the MAX2643 by connecting RFOUT to GND through a 10kΩ resistor.
Minimum DC voltage through a 10kΩ resistor that sets the MAX2643 to operate in normal mode.
Maximum DC voltage through a 10kΩ resistor that sets the MAX2643 to operate in shutdown mode.
Min/Max limits are guaranteed by design and characterization, except gain is production tested at T
A
= +25°C.
The part has been characterized at the specified frequency range. Operation outside this range is possible but not guar-
anteed.
Devices are production tested at T
A
= +25°C.
Measured with two input tones, f
1
= 895MHz and f
2
= 905MHz, both at -30dBm per tone.
Excludes PC board losses (0.25dB typical at the input of the MAX2642/MAX2643 EV kit).
_______________________________________________________________________________________
3
900MHz SiGe, High IP3,
Low-Noise Amplifiers
MAX2642/MAX2643
Typical Operating Characteristics
(MAX2642/MAX2643 EV kits, V
CC
= +3.0V, P
RFIN
= -30dBm, input and output are terminated to 50Ω, f
RFIN
= 900MHz, R
BIAS
=
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), T
A
= +25°C, unless otherwise noted.)
INPUT THIRD-ORDER INTERCEPT
vs. R
BIAS
(HIGH GAIN)
MAX2642/43-01
MAX2642/43-02
3
1
INPUT IP3 (dBm)
-1
-3
-5
-7
-9
-11
-13
-15
0
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
MATCHED AT 900MHz
LOW GAIN
5
NOISE FIGURE (dB)
4
3
2
1
INPUT IP3 (dBm)
T
A
= +85°C
HIGH GAIN
T
A
= -40°C
T
A
= +25°C
-15
200 400 600 800 1000 1200 1400 1600 1800
R
BIAS
(Ω)
0
500
1000
R
BIAS
(Ω)
1500
2000
0
800 820 840 860 880 900 920 940 960 980 1000
FREQUENCY (MHz)
NOISE FIGURE vs. TEMPERATURE
MAX2642/43-04
P1dB vs. R
BIAS
MAX2642/43-05
OUTPUT POWER vs. INPUT POWER
8
4
0
P
OUT
(dBm)
-4
-8
-12
-16
1.1kΩ, LOW GAIN
806Ω, LOW GAIN
510Ω, LOW GAIN
-30
-26
-22
-18
-14
-10
-6
-2
2
510Ω, HIGH GAIN
806Ω, HIGH GAIN
1.1kΩ, HIGH GAIN
MAX2642/43-06
MAX2642/43-09
6
5
NOISE FIGURE (dB)
LOW GAIN
4
3
2
1
0
-40
-20
0
20
40
60
80
HIGH GAIN
-8
T
A
= +85°C, LOW GAIN
-10
-12
P1dB (dBm)
-14
-16
-18
-20
-22
-24
100
0
T
A
= -40°C,
HIGH GAIN
T
A
= +25°C, LOW GAIN
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
12
-20
T
A
= +25°C, HIGH GAIN
-24
-28
200 400 600 800 1000 1200 1400 1600 1800
R
BIAS
(Ω)
TEMPERATURE (°C)
P
IN
(dBm)
GAIN vs. R
BIAS
20
18
16
14
12
10
8
6
4
2
0
-2
-4
0
T
A
= +85°C, LOW GAIN
200 400 600 800 1000 1200 1400 1600 1800
R
BIAS
(Ω)
GAIN (dB)
MAX2642/43-07
GAIN vs. SUPPLY VOLTAGE
MAX2642/43-08
GAIN vs. FREQUENCY
20
18
16
14
GAIN (dB)
12
10
8
6
HIGH-GAIN MODE
MATCHED AT 900MHz
20
18
16
14
12
GAIN (dB)
10
8
6
4
2
0
-2
-4
2.4
2.8
3.2
3.6
4.0
V
CC
(V)
4.4
4.8
5.2
T
A
= -40°C, HIGH GAIN
T
A
= -40°C, HIGH GAIN
T
A
= +25°C,
HIGH GAIN
T
A
= +85°C, HIGH GAIN
T
A
= +25°C, HIGH GAIN
T
A
= +85°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= +25°C, LOW GAIN
T
A
= +25°C, LOW GAIN
T
A
= -40°C, LOW GAIN
T
A
= +85°C, LOW GAIN
4
2
0
5.6
LOW-GAIN MODE
800 820 840 860 880 900 920 940 960 980 1000
FREQUENCY (MHz)
4
_______________________________________________________________________________________
MAX2642/43-03
5
MAX2642
INPUT THIRD-ORDER INTERCEPT
vs. R
BIAS
(LOW GAIN)
11
9
7
5
3
1
-1
-3
-5
-7
-9
-11
-13
6
NOISE FIGURE vs. FREQUENCY
900MHz SiGe, High IP3,
Low-Noise Amplifiers
Typical Operating Characteristics (continued)
(MAX2642/MAX2643 EV kits, V
CC
= +3.0V, P
RFIN
= -30dBm, input and output are terminated to 50Ω, f
RFIN
= 900MHz, R
BIAS
=
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), T
A
= +25°C, unless otherwise noted.)
MAX2642
ATTENUATION STEP vs. FREQUENCY
MAX2642/43-10
MAX2642/MAX2643
RETURN LOSS vs. FREQUENCY
(HIGH GAIN)
MAX2642/43-11
MAX2642
RETURN LOSS vs. FREQUENCY
(LOW GAIN)
MATCHED AT 900MHz
MAX2642/43-12
14.0
13.8
ATTENUATION STEP (dB)
13.6
13.4
13.2
13.0
12.8
12.6
MATCHED AT 900MHz
0
-5
ATTENUATION STEP (dB)
MATCHED AT 900MHz
INPUT
0
-5
RETURN LOSS (dB)
-10
-15
-20
-25
-30
-35
-10
-15
OUTPUT
-20
-25
-30
-35
OUTPUT
INPUT
800 820 840 860 880 900 920 940 960 980 1000
FREQUENCY (MHz)
800 820 840 860 880 900 920 940 960 980 1000
FREQUENCY (MHz)
800 820 840 860 880 900 920 940 960 980 1000
FREQUENCY (MHz)
REVERSE ISOLATION vs. FREQUENCY
MATCHED AT 900MHz
MAX2642/43-13
MAX2642
HIGH/LOW-GAIN SWITCH
CHARACTERISTICS
MAX2642/43-14
MAX2643
SHUTDOWN CHARACTERISTICS
-10
OUTPUT POWER (dBm)
-20
-30
-40
-50
-60
-70
-80
V
RFOUT
3V
0V
MAX2642/43-15
0
-5
RETURN LOSS (dB)
-10
-15
-20
0
-10
OUTPUT POWER (dBm)
-20
-30
-40
0V
-50
-60
V
RFOUT
3V
0
LOW GAIN
HIGH GAIN
-25
-30
-35
800 820 840 860 880 900 920 940 960 980 1000
FREQUENCY (MHz)
-90
TIME (400ns/div)
TIME (4µs/div)
SUPPLY CURRENT vs. R
BIAS
MAX2642/43-16
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX2642/43-17
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
7.6
7.2
SUPPLY VOLTAGE (mA)
6.8
6.4
6.0
5.6
5.2
4.8
4.4
T
A
= +25°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
T
A
= -40°C,
HIGH GAIN
T
A
= +85°C, HIGH GAIN
T
A
= +85°C, LOW GAIN
T
A
= +25°C, LOW GAIN
MAX2642/43-18
16
14
SUPPLY CURRENT (mA)
12
10
8
6
4
2
0
0
T
A
= -40°C, HIGH GAIN
T
A
= +85°C, LOW GAIN
T
A
= +85°C, HIGH GAIN
T
A
= +25°C, LOW GAIN
T
A
= +25°C, HIGH GAIN
T
A
= -40°C, LOW GAIN
10
V
CC
= 5.5V
8.0
SHUTDOWN CURRENT (µA)
1
0.1
0.01
V
CC
= 3.0V
0.001
0.0001
200 400 600 800 1000 1200 1400 1600
R
BIAS
(Ω)
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
4.0
2.4
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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