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.
________________________Applications
800MHz/900MHz Cellular Phones
900MHz Cordless Phones
868MHz/900MHz ISM-Band Wireless Data
PMR/SMR/LMR
Features
♦Wide Frequency Range: 800MHz to 1000MHz
♦High Output IP3 and Adjustable
+17dBm at 5.3mA
+7dBm at 2.8mA
♦Low Noise Figure: 1.3dB at 900MHz
♦13dB Attenuation Step (MAX2642)
♦On-Chip Output Matching
♦Low-Power Shutdown Mode
♦+2.7V to +5.5V Single-Supply Operation
♦Ultra-Small SC70-6 Package
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
________________________________________________________________ Maxim Integrated Products 1
GND
VCC
RFIN
16RFOUT
5GND
BIAS
MAX2642
MAX2643
SC70-6
TOP VIEW
2
34
Pin Configuration
19-1682; Rev 0; 4/00
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.
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information
6 SC70-6
PIN-
PACKAGE
TEMP. RANGE
-40°C to +85°C
MAX2642EXT-T
PART
AAC
TOP
MARK
6 SC70-6-40°C to +85°C
MAX2643EXT-T AAD
MAX2642
MAX2643
RF
INPUT
GND
RFIN RFOUT
( ) ARE FOR MAX2643.
C1
3.3pF
L1
8.7nH
BIAS
VCC
VCC
47pF
RBIAS
510Ω
RF
OUTPUT
33k
(10k)
LOW GAIN
(ENABLE)
HIGH GAIN
(SHUTDOWN)
BIAS
Typical Operating Circuit
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS—MAX2642
(VCC = +2.7V to +5.5V, TA= -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 VCC = 3.0V, TA= +25°C, unless otherwise noted.) (Notes 1, 2, 3)
DC ELECTRICAL CHARACTERISTICS—MAX2643
(VCC = +2.7V to +5.5V, TA= -40°C to +85°C, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50Ω. Typical
values are at VCC = 3.0V, TA= +25°C, unless otherwise noted.) (Notes 1, 8, 9)
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.
VCC to GND..............................................................-0.3V to +6V
RFOUT to GND...........................................-0.3V to (VCC + 0.3V)
RFIN to GND ..................................................................0 to 0.9V
RFIN Power (50Ωsource) ................................................+5dBm
BIAS to GND ................................................................0 to +0.3V
Operating Temperature Range ...........................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Continuous Power Dissipation (TA= +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
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage 2.7 5.5 V
High-gain mode, RBIAS = 510Ω, TA = +25°C 5.3 6.7
RBIAS = 510Ω, TA = -40°C to +85°C 7.5
RBIAS = 806Ω3.6
RBIAS = 1.1kΩ2.8
Operating Supply Current
Low-gain mode, RBIAS = 510Ω, TA = 25°C 5.9
mA
Shutdown Supply Current BIAS = unconnected (see Applications Information) 0.2 mA
High-gain mode (Note 4) 0.6
Gain Control Voltage Input Low-gain mode (Note 5) 2.0 V
High-gain mode (Note 6) -10 0
Gain Control Input Current Low-gain mode (Note 7) 0 50 µA
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage 2.7 5.5 V
RBIAS = 510Ω, TA = +25°C 5.1 6.5
RBIAS = 510Ω, TA = -40°C to +85°C 7.3
RBIAS = 806Ω3.4
Operating Supply Current
RBIAS = 1.1kΩ2.6
mA
Shutdown Supply Current Shutdown mode (see Applications Information) 0.2 10 µA
Normal operation (Note 10) 2.0
Shutdown Control Input Voltage Shutdown mode (Note 11) 0.6 V
Normal operation (Note 7) 0 10
Shutdown Control Input Current Shutdown mode (Note 6) -5 5 µA
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
_______________________________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(MAX2642/MAX2643 EV kits, PRFIN = -30dBm, fRFIN = 900MHz, input and output are terminated to 50Ω, VCC = +3.0V, TA= +25°C,
RBIAS = 510Ω, unless otherwise noted.) (Note 12)
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
Operating Frequency Range (Note 13)
800 1000
MHz
Gain (Note 14) TA = +25°C
14.5 16.7
19 dB
Gain Variation Over Temperature
TA = -40°C to +85°C
±0.35 ±0.75
dB
Attenuation Step MAX2642 only 13 dB
RBIAS = 510Ω0
RBIAS = 806Ω-5
Input Third-Order Intercept Point
(Note 15) RBIAS = 1.1kΩ-10
dBm
-18
Input 1dB Compression Point MAX2642, low-gain mode -17
dBm
1.35
1.6
Noise Figure (Note 16) MAX2642, low-gain mode 4.3 dB
-10 -12
Input Return Loss MAX2642, low-gain mode -10 -18 dB
-10 -14
Output Return Loss MAX2642, low-gain mode -10 -11 dB
-20 -26
Reverse Isolation MAX2642, low-gain mode -10 -17 dB
Gain-Step Response Time MAX2642 5 10 µs
MAX2643 6 10
Shutdown Response Time
MAX2642, through series switch at BIAS 12
µs
Note 1: Devices are production tested at TA= +25°C. Minimum and maximum values are guaranteed by design and characterization
over temperature and supply voltage.
Note 2: High-gain mode is set for the MAX2642 by connecting RFOUT to GND through a 33kΩresistor.
Note 3: Low-gain mode is applicable only to the MAX2642 and is set by connecting RFOUT to VCC through a 33kΩresistor.
Note 4: Maximum DC voltage through a 33kΩresistor that sets the MAX2642 to operate in high-gain mode.
Note 5: Minimum DC voltage through a 33kΩresistor that sets the MAX2642 to operate in low-gain mode.
Note 6: DC current required when RFOUT is connected to GND through a 33kΩresistor (MAX2642) and 10kΩresistor (MAX2643).
Note 7: DC current required when RFOUT is connected to VCC through a 33kΩresistor (MAX2642) and 10kΩresistor (MAX2643).
Note 8: Normal operation is set for the MAX2643 by connecting RFOUT to VCC through a 10kΩresistor.
Note 9: Shutdown is set for the MAX2643 by connecting RFOUT to GND through a 10kΩresistor.
Note 10: Minimum DC voltage through a 10kΩresistor that sets the MAX2643 to operate in normal mode.
Note 11: Maximum DC voltage through a 10kΩresistor that sets the MAX2643 to operate in shutdown mode.
Note 12: Min/Max limits are guaranteed by design and characterization, except gain is production tested at TA= +25°C.
Note 13: The part has been characterized at the specified frequency range. Operation outside this range is possible but not guar-
anteed.
Note 14: Devices are production tested at TA= +25°C.
Note 15: Measured with two input tones, f1= 895MHz and f2= 905MHz, both at -30dBm per tone.
Note 16: Excludes PC board losses (0.25dB typical at the input of the MAX2642/MAX2643 EV kit).
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
4 _______________________________________________________________________________________
Typical Operating Characteristics
(MAX2642/MAX2643 EV kits, VCC = +3.0V, PRFIN = -30dBm, input and output are terminated to 50Ω, fRFIN = 900MHz, RBIAS =
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), TA= +25°C, unless otherwise noted.)
-15
-11
-13
-7
-9
-3
-5
-1
3
1
5
0 400 600 800200 1000 1200 1400 1600 1800
INPUT THIRD-ORDER INTERCEPT
vs. RBIAS (HIGH GAIN)
MAX2642/43-01
RBIAS (Ω)
INPUT IP3 (dBm)
TA = +85°C
TA = +25°C
TA = -40°C
-15
-1
-3
3
1
7
5
9
11
MAX2642
INPUT THIRD-ORDER INTERCEPT
vs. RBIAS (LOW GAIN)
MAX2642/43-02
RBIAS (Ω)
INPUT IP3 (dBm)
0 500 1000 1500 2000
-5
-7
-9
-11
-13
TA = +85°C
TA = +25°C
TA = -40°C
0
3
2
1
4
5
6
800 880860820 840 900 920 940 960 980 1000
NOISE FIGURE vs. FREQUENCY
MAX2642/43-03
FREQUENCY (MHz)
NOISE FIGURE (dB)
LOW GAIN
HIGH GAIN
MATCHED AT 900MHz
0
1
2
4
3
5
6
-40 -20 0 20 40 60 80 100
NOISE FIGURE vs. TEMPERATURE
MAX2642/43-04
TEMPERATURE (°C)
NOISE FIGURE (dB)
LOW GAIN
HIGH GAIN
-24
-20
-22
-14
-16
-18
-10
-12
-8
0 600 800200 400 1000 1200 1400 1600 1800
P1dB vs. RBIAS
MAX2642/43-05
RBIAS (Ω)
P1dB (dBm)
TA = -40°C,
HIGH GAIN
TA = +85°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
-28
-20
-24
-12
-16
-4
-8
0
8
4
12
-30 -22 -18-26 -14 -10 -6 -2 2
OUTPUT POWER vs. INPUT POWER
MAX2642/43-06
PIN (dBm)
POUT (dBm)
510Ω, HIGH GAIN
1.1kΩ, LOW GAIN
510Ω, LOW GAIN
806Ω, LOW GAIN
806Ω, HIGH GAIN
1.1kΩ, HIGH GAIN
0
4
2
8
6
12
10
14
18
16
20
0 400 600 800200 1000 1200 1400 1600 1800
GAIN vs. RBIAS
MAX2642/43-07
RBIAS(Ω)
GAIN (dB)
-2
-4
TA = +85°C, HIGH GAIN
TA = -40°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C,
HIGH GAIN
TA = +25°C, LOW GAIN
4
10
8
6
12
14
18
16
20
2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6
GAIN vs. SUPPLY VOLTAGE
MAX2642/43-08
VCC (V)
GAIN (dB)
2
0
-2
-4
TA = +85°C, HIGH GAIN
TA = -40°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
0
4
2
8
6
12
10
14
18
16
20
800 840 860 880820 900 920 940 980960 1000
GAIN vs. FREQUENCY
MAX2642/43-09
FREQUENCY (MHz)
GAIN (dB)
MATCHED AT 900MHz
LOW-GAIN MODE
HIGH-GAIN MODE
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
_______________________________________________________________________________________ 5
12.6
13.0
12.8
13.4
13.2
13.8
13.6
14.0
800 880840 920 960820 900860 940 980 1000
MAX2642
ATTENUATION STEP vs. FREQUENCY
MAX2642/43-10
FREQUENCY (MHz)
ATTENUATION STEP (dB)
MATCHED AT 900MHz
-35
-25
-30
-15
-20
-5
-10
0
800 880840 920 960820 900860 940 980 1000
RETURN LOSS vs. FREQUENCY
(HIGH GAIN)
MAX2642/43-11
FREQUENCY (MHz)
ATTENUATION STEP (dB)
MATCHED AT 900MHz
INPUT
OUTPUT
-35
-25
-30
-15
-20
-5
-10
0
800 880840 920 960820 900860 940 980 1000
MAX2642
RETURN LOSS vs. FREQUENCY
(LOW GAIN)
MAX2642/43-12
FREQUENCY (MHz)
RETURN LOSS (dB)
MATCHED AT 900MHz
INPUT
OUTPUT
-35
-25
-30
-15
-20
-5
-10
0
800 880840 920 960820 900860 940 980 1000
REVERSE ISOLATION vs. FREQUENCY
MAX2642/43-13
FREQUENCY (MHz)
RETURN LOSS (dB)
MATCHED AT 900MHz
LOW GAIN
HIGH GAIN
-60
-50
-20
-10
-30
-40
0
MAX2642
HIGH/LOW-GAIN SWITCH
CHARACTERISTICS
MAX2642/43-14
TIME (400ns/div)
OUTPUT POWER (dBm)
VRFOUT
0V
3V
-90
-70
-80
-50
-60
-40
-30
-10
-20
0
MAX2643
SHUTDOWN CHARACTERISTICS
MAX2642/43-15
TIME (4µs/div)
OUTPUT POWER (dBm)
VRFOUT
0V
3V
0
4
2
8
6
10
12
14
16
0 400 600200 800 1000 1200 1400 1600
SUPPLY CURRENT vs. RBIAS
MAX2642/43-16
RBIAS (Ω)
SUPPLY CURRENT (mA)
TA = +85°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
TA = -40°C, HIGH GAIN
0.0001
0.1
0.01
0.001
10
1
-40 -20 0 20 40 60 80 100
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX2642/43-17
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
VCC = 5.5V
VCC = 3.0V
4.0
4.8
4.4
5.6
5.2
6.4
6.0
6.8
7.6
7.2
8.0
2.4 3.2 3.62.8 4.0 4.4 4.8 5.2 5.6
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2642/43-18
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (mA)
TA = +85°C, HIGH GAIN
TA = -40°C, LOW GAIN
TA = +85°C, LOW GAIN
TA = +25°C, LOW GAIN
TA = +25°C, HIGH GAIN
TA = -40°C,
HIGH GAIN
Typical Operating Characteristics (continued)
(MAX2642/MAX2643 EV kits, VCC = +3.0V, PRFIN = -30dBm, input and output are terminated to 50Ω, fRFIN = 900MHz, RBIAS =
510Ω, high-gain mode (low-gain mode is applicable only to the MAX2642), TA= +25°C, unless otherwise noted.)
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
6 _______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1 BIAS
Resistor Bias Control. Connect a resistor, RBIAS, from BIAS to ground. RBIAS sets IP3 and supply
current (see Applications Information). The current through this pin is approximately 50mV divided
by RBIAS.
2, 5 GND Ground. For optimum performance, provide a low-inductance connection to the ground plane.
3 RFIN Amplifier Input. AC-couple to this pin with a DC-blocking capacitor. External matching network is
required for optimum performance.
4V
CC Supply Voltage. Bypass with a 47pF capacitor directly to ground at the supply pin. Additional
bypassing may be necessary for long VCC lines.
6 RFOUT Amplifier Output. Internally matched to 50Ω. DC bias on this pin selects gain mode (MAX2642) or
shutdown mode (MAX2643) (see Applications Information).
Applications Information
Input Matching
Input matching is required for optimum performance.
The MAX2642/MAX2643 require a simple LC matching
network, as shown in the Typical Operating Circuit. To
further reduce cost and external component count,
replace the external inductor with a microstrip transmis-
sion line. The Typical Operating Circuit shows the rec-
ommended input-matching networks for the MAX2642/
MAX2643 at 900MHz. These values are optimized for
best simultaneous gain, noise figure, and return-loss
performance. To aid in the design of the matching net-
work for other frequencies, Tables 1–6 list typical
device S-parameters for various biases, and Tables 7,
8, and 9 list typical device noise parameters.
Attenuation Step (MAX2642)
The MAX2642’s DC bias voltage at RFOUT serves as
an attenuation step input. When the DC voltage at
RFOUT through a 33kΩresistor is less than +0.6V, the
device is in high-gain mode; if the DC voltage is greater
than +2.0V, the device is in low-gain mode. A standard
logic output can be applied as shown in the Typical
Operation Circuit. If no bias is applied, the device is in
high-gain mode.
Shutdown
For the MAX2643, the recommended shutdown method
is to set the DC voltage at the RFOUT pin in a manner
similar to the MAX2642’s attenuation step. That is, when
the DC voltage at RFOUT is below +0.6V, the device is
shut down; if the DC voltage is greater than +2.0V, the
device is enabled.
For the MAX2642, shutdown is achieved by leaving
BIAS unconnected. Figure 1 shows the suggested
shutdown methods. Avoid capacitance at the BIAS pin
by connecting the bias resistor from BIAS to the switch.
Table 10 summarizes the operational modes.
Layout Issues
A properly designed PC board is essential to any
RF/microwave circuit. Use controlled impedance lines
on all high-frequency inputs and outputs. Bypass with
decoupling capacitors located close to the device VCC
pin. For long VCC lines, it may be necessary to add
additional decoupling capacitors. These additional
capacitors can be located farther away from the device
package. Proper grounding of the GND pins is essen-
tial. If the PC board uses a topside RF ground, connect
it directly to all GND pins. For a board where the
ground plane is not on the component layer, the best
technique is to connect the GND pins to the board with
a plated through-hole located close to the package.
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
_______________________________________________________________________________________ 7
Table 1. MAX2642/MAX2643 Typical Scattering Parameters
(RBIAS = 510Ω, high-gain mode, VCC = +3.0V, TA= +25°C.)
FREQ
(MHz)
S11 MAG
S11 PHASE
(DEGREES)
S21 MAG
S21 PHASE
(DEGREES)
S12 MAG
S12 PHASE
(DEGREES)
S22 MAG
S22 PHASE
(DEGREES)
500
0.832641
-69.5831
2.390806
-119.18
0.010763 166.6047 0.878515
-74.01422
600
0.825168
-83.7622
3.836967
-136.451
0.019608 167.8741 0.731997
-98.95091
700
0.785389
-97.3356
4.983279
-161.126 0.02988
148.5203 0.481344
-125.1027
800 0.73798 -108.682
5.320575 174.5337 0.036197 134.8794 0.215462
-142.0387
820
0.728099
-110.578 5.286
170.3323 0.037193
132.505
0.171633
-141.9486
840
0.718704
-112.499
5.241719 166.3987 0.037266 129.1671 0.135415
-139.9869
860
0.711335
-114.276
5.185213 162.4763 0.039143 128.0447 0.100779
-133.8375
880
0.705742
-115.973
5.118265 158.9238 0.039563 128.4158 0.076864
-121.3533
900
0.699509
-117.585
5.050356 155.6292 0.042586
128.075
0.062918
-102.3972
920
0.695913
-119.117
4.973824 152.4338 0.041805 126.9362
0.06007
-81.32555
940
0.690406
-120.995
4.897571 149.4286
0.04301
122.9564 0.065287
-62.51575
960 0.68522 -122.642
4.826106 146.6999 0.046528 122.0997 0.077374
-50.8638
980
0.681722
-124.345
4.735407 143.8275
0.04524
121.0474 0.090494
-44.30662
1000
0.675328
-126.035
4.650673 141.4611 0.046036 120.1779 0.103072
-40.69565
1100
0.657582
-134.195 4.29304
130.7613 0.053825 116.4169 0.156945
-34.00603
1200
0.635999
-141.558
3.998256 121.5475 0.061434 109.6365 0.198686
-32.62157
1300
0.616881
-147.886
3.777511 113.2893 0.066092
103.583
0.240437
-33.12784
1400
0.602418
-153.992
3.547677 105.6808 0.075756 99.08275 0.283245
-36.62076
1500
0.587409
-158.21
3.338385 97.62961 0.076491 92.84421 0.326279
-40.68451
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
8 _______________________________________________________________________________________
Table 2. MAX2642/MAX2643 Typical Scattering Parameters
(RBIAS = 806Ω, high-gain mode, VCC = +3.0V, TA= +25°C.)
FREQ
(MHz)
S11 MAG
S11 PHASE
(DEGREES)
S21 MAG
S21 PHASE
(DEGREES)
S12 MAG
S12 PHASE
(DEGREES)
S22 MAG
S22 PHASE
(DEGREES)
500
0.865705
-67.5629
1.788918
-115.899
0.009763 164.6001 0.880237 -73.81893
600
0.853946
-80.7084
2.926709
-132.446
0.021656
165.374
0.739354 -99.52715
700
0.820187
-94.1329
3.884537
-157.426
0.029766 148.5047
0.49107
-128.1454
800
0.775557
-104.428
4.237314 177.9528 0.036728 130.1148 0.216415 -153.3392
820
0.765138
-106.343
4.226094 173.3886 0.038253 129.5942 0.166772 -157.7809
840 0.759 -108.042
4.214913
169.298
0.038842 128.7876 0.121201 -160.7175
860 0.7495 -109.928
4.182436 165.3457 0.040084 127.3742 0.082263 -160.9349
880
0.741722
-111.683
4.134814
161.548 0.04118
127.2791 0.045314 -158.0615
900
0.736069
-113.369
4.085018 157.8688
0.04194
125.3719 0.016624 -133.0426
920
0.728957
-115.127
4.032105 154.6118 0.044642 123.3553 0.021369 -38.41852
940
0.724118
-116.951
3.965561 151.3371 0.044574 121.8034 0.043243 -17.90431
960
0.719676
-118.584
3.903364 148.3141 0.044792 120.7695 0.066898 -14.20027
980
0.714506
-120.313 3.83867
145.3527 0.045551
118.109
0.084163 -12.76007
1000
0.709103
-121.959 3.777
142.7001 0.046434
119.036
0.102269 -13.88384
1100
0.691292
-129.341
3.483283 131.8578 0.054775 114.7347 0.169693 -18.18657
1200 0.67035 -136.703 3.27255
121.9156 0.061407 108.2008 0.220689 -21.72272
1300
0.650556
-143.014 3.09574
113.1691 0.064829 103.5856
0.26965
-24.86245
1400
0.635363
-148.565
2.934971 105.3286 0.075142
97.9223
0.315264 -30.21604
1500
0.616202
-153.536
2.756155 96.43876 0.074664 92.88747 0.360706 -35.70454
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
_______________________________________________________________________________________ 9
Table 3. MAX2642/MAX2643 Typical Scattering Parameters
(RBIAS = 1.1kΩ, high-gain mode, VCC = +3.0V, TA= +25°C.)
FREQ
(MHz)
S11 MAG
S11 PHASE
(DEGREES)
S21 MAG
S11 PHASE
(DEGREES)
S12 MAG
S12 PHASE
(DEGREES)
S22 MAG
S22 PHASE
(DEGREES)
500
0.878512
-66.0475
1.445864
-114.652
0.011049 175.9688 0.882121
-73.97408
600 0.86813 -79.0081
2.398259
-131.281 0.01977
166.0087 0.745577
-100.0799
700
0.834311
-91.9431
3.218232
-155.869
0.033312 149.3926 0.502282
-129.8978
800
0.793611
-102.384
3.544617 179.1002 0.038594 131.9641 0.223248
-160.5161
820
0.783644
-104.098
3.563583 174.4488 0.040112 131.6111 0.173175
-166.8809
840
0.774329
-105.921
3.546937 170.1934 0.038383 128.1902 0.126351
-173.2415
860
0.767016
-107.766
3.529998
165.871 0.04004
126.4807 0.086328
178.6352
880
0.762463
-109.461
3.500193 161.8438 0.041375 124.4402 0.049822
167.1237
900
0.753622
-111.254
3.463616 158.0655 0.043587 123.8527 0.020398
128.5957
920
0.748921
-113.148
3.419726 154.6982 0.043975 123.9237 0.024778
48.71712
940
0.743011
-114.988 3.36768
151.2749 0.045614 121.0385
0.04661 18.5372
960
0.737437
-116.709
3.309045 148.0373 0.044426 118.9012 0.070736
10.02515
980
0.733572
-118.379
3.261195 145.4087 0.046581
118.374
0.092621
4.197083
1000
0.729122
-119.87
3.203007 142.5148 0.048343 116.9249 0.110062
-0.293905
1100
0.710864
-127.286
2.970843 130.8328 0.055616 115.1579 0.183756
-10.46082
1200
0.688941
-134.781
2.789044 120.5809 0.061803 105.9973 0.238134
-16.81635
1300
0.668471
-141.275
2.637086 111.4044 0.065281 100.6171 0.289607
-21.34393
1400
0.655478
-146.685
2.491515 103.3737 0.073887 96.84646 0.335752
-27.6725
1500
0.638124
-152.12
2.352013 94.07729 0.077901 90.34502 0.381179
-33.81158
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
10 ______________________________________________________________________________________
Table 4. MAX2642 Typical Scattering Parameters
(RBIAS = 510Ω, low-gain mode, VCC = +3.0V, TA= +25°C.)
FREQ
(MHz)
S11 MAG
S11 PHASE
(DEGREES)
S21 MAG
S21 PHASE
(DEGREES)
S12 MAG
S12 PHASE
(DEGREES)
S22 MAG
S22 PHASE
(DEGREES)
500
0.757279
-68.0641
0.186886
-175.019
0.032297 163.9787
0.87996 -73.8882
600 0.75734 -84.3042
0.715305
-146.702
0.066113 148.5775
0.71413 -98.6736
700
0.696969
-98.422
1.140352
-174.61
0.099941 124.8504 0.449346
-121.361
800
0.626874
-107.497
1.272844 157.4571 0.115242 103.1406 0.201112
-127.267
820
0.616023
-108.596
1.267541
152.644
0.116521 100.3007 0.165909
-123.451
840
0.608751
-109.794
1.258504 148.0772 0.117601 97.74948 0.137812
-116.955
860
0.600617
-110.754
1.242296 143.7583 0.119312 95.48379 0.118557
-107.057
880
0.596488
-111.776 1.22394
139.7228 0.122318 93.07481 0.106845
-93.617
900
0.593722
-112.739
1.203776 135.9799 0.124196 90.21815 0.103446
-81.5882
920
0.590101
-113.712
1.181885 132.3471 0.125203
86.9857
0.108109
-70.2192
940
0.588409
-114.834
1.156787
128.909
0.126462 84.27329 0.116508
-61.7886
960
0.589625
-115.806
1.129734 125.6671 0.127369 82.07469 0.129083
-55.1485
980
0.588079
-116.828
1.102653 122.5478 0.127952 80.98836 0.140436
-52.3827
1000
0.588646
-117.975
1.074686 119.9067
0.12743
79.48192 0.151608
-48.4917
1100
0.597562
-124.002
0.952505 108.5103 0.134236 72.42102 0.206216
-43.8143
1200 0.6066 -129.873
0.852237
99.7348
0.138354 65.08001 0.252003
-43.9084
1300
0.617079
-136.272
0.778154 92.06538 0.142609 58.40858 0.295689
-46.8967
1400
0.628195
-142.195
0.718399
85.7905
0.153771 52.64912
0.33692 -51.7496
1500
0.640304
-147.446
0.656535 78.77735 0.149518 46.71009 0.374046
-56.7658
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
______________________________________________________________________________________ 11
Table 5. MAX2642 Typical Scattering Parameters
(RBIAS = 806Ω, low-gain mode, VCC = +3.0V, TA= +25°C.)
FREQ
(MHz)
S11 MAG
S11 PHASE
(DEGREES) S21 MAG
S21 PHASE
(DEGREES) S12 MAG
S12 PHASE
(DEGREES) S22 MAG
S22 PHASE
(DEGREES)
500
0.800327
-67.1945
0.142134
-174.341
0.034805
161.583 0.88084
-73.57176
600
0.793203
-81.9096
0.543072
-143.848
0.067027 146.5234 0.719105
-99.08562
700
0.736656
-95.21
0.885917
-171.542
0.101665 122.4962 0.449898
-124.5513
800
0.676741
-103.586
1.005172 159.8524 0.114894 101.0446 0.183694
-136.0146
820
0.666567
-104.763
1.005053 154.9507 0.115809 97.08399 0.143872
-133.6185
840
0.660377
-106.009
0.998032 150.1753 0.118042 94.72314 0.109486
-125.307
860
0.651791
-107.125
0.990225 145.7345 0.118937 91.64486 0.085206
-112.6535
880
0.651106
-108.175
0.978178 141.4141 0.121575 89.19647 0.071836
-92.15154
900
0.643048
-109.302
0.961026 137.4554 0.120654 86.75212
0.0738
-70.16955
920
0.643064
-110.728
0.942776 133.7632 0.123645 83.74419 0.084769
-54.68721
940
0.641773
-111.842
0.923851 130.1361 0.123333 80.71953 0.098778
-46.62902
960
0.640079
-113.103 0.90238
126.9098
0.12394
78.64308 0.117484
-40.63098
980
0.641175
-114.555
0.879907 123.7699 0.123001 76.38534 0.132356
-38.28101
1000
0.641025
-115.739
0.857382 120.9598 0.122316 74.64619 0.145883
-35.93101
1100
0.647379
-121.754
0.760331
109.613
0.127968 68.72507 0.209937
-35.70716
1200
0.651053
-128.101
0.685309 100.4887 0.131962 62.04964 0.260554
-37.84105
1300 0.65637 -134.578
0.623917
93.1824
0.132337 56.01043 0.303628
-41.83445
1400
0.662035
-139.905
0.582929 86.98415 0.142149
51.5965 0.34549
-46.96146
1500
0.665418
-145.73 0.53929
79.50793 0.138295 45.87176 0.382116
-52.44192
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
12 ______________________________________________________________________________________
Table 6. MAX2642 Typical Scattering Parameters
(RBIAS = 1.1Ω, low-gain mode, VCC = +3.0V, TA= +25°C.)
FREQ
(MHz)
S11 MAG
S11 PHASE
(DEGREES)
S21 MAG
S21 PHASE
(DEGREES)
S12 MAG
S12 PHASE
(DEGREES)
S22 MAG
S22 PHASE
(DEGREES)
500
0.822139
-66.5029
0.116321
-174.275 0.03386
162.1213 0.879442
-73.74798
600
0.808058
-80.314
0.439837
-143.103
0.065964 146.0581 0.724703
-99.6653
700
0.755255
-93.0574 0.72921 -170.915 0.0999
121.1126 0.457496
-126.0206
800
0.703243
-101.403
0.838753 160.4014 0.115609 98.56961 0.181063
-141.9359
820
0.694461
-102.693
0.839017 155.3972 0.116069 94.64113 0.138616
-140.7761
840
0.687512
-103.96
0.836295
150.551
0.117021 92.14834 0.098228
-136.1769
860
0.683106
-105.16 0.82921
145.8221 0.116949 88.49732 0.068493
-122.4536
880
0.678346
-106.424
0.818297 141.5384 0.119552 86.39616 0.049577
-93.92001
900
0.674815
-107.654
0.807407 137.4799 0.121372 83.98519 0.052964
-64.05054
920
0.672424
-109.092
0.791395 133.7297 0.122328 80.33097 0.070844
-44.45571
940
0.671111
-110.488
0.775375 129.9834 0.120584 78.46327 0.089595
-37.15094
960
0.669825
-111.738
0.757139 126.6652 0.120221 75.62165 0.110248
-31.16879
980
0.670457
-113.266
0.737655 123.3462 0.120881 73.65825 0.125584
-29.76813
1000
0.669392
-114.649
0.719178 120.6109
0.11967
71.31908
0.14489 -28.6178
1100
0.674741
-120.914
0.638029 109.1083 0.123318 66.28802
0.21152
-30.89364
1200
0.675283
-127.763
0.575544 100.3768 0.125601 58.42145 0.264377
-34.10688
1300
0.679379
-134.523 0.52948
92.75184 0.126691 54.07481 0.308252
-38.78385
1400
0.682813
-139.869
0.494615 86.94255 0.133067 49.83734 0.348366
-44.59462
1500
0.681251
-145.854
0.462984
79.4068
0.128294 43.41453 0.386044
-50.022
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
______________________________________________________________________________________ 13
Table 7. MAX2642/MAX2643 Typical Noise Parameters
(RBIAS = 510Ω, high-gain mode, VCC = +3.0V, TA= +25°C.)
FREQUENCY
(MHz)
NFMIN
(dB)
Γopt
MAG
Γopt PHASE
(DEGREES)
RN
(Ω)
800 1.011 0.3074 55.04 13.11
850 1.023 0.3016 58.89 13.28
875 1.030 0.2990 60.83 13.38
900 1.037 0.2965 62.77 13.49
925 1.045 0.2942 64.70 13.60
950 1.053 0.2919 66.62 13.72
1000 1.069 0.2879 70.40 13.96
Table 8. MAX2642/MAX2643 Typical Noise Parameters
(RBIAS = 806Ω, high-gain mode, VCC = +3.0V, TA= +25°C.)
FREQUENCY
(MHz)
NFMIN
(dB)
Γopt
MAG
Γopt PHASE
(DEGREES)
RN
(Ω)
800 1.149 0.3905 54.95 15.14
850 1.161 0.3832 58.63 15.32
875 1.168 0.3798 60.49 15.43
900 1.176 0.3766 62.35 15.55
925 1.185 0.3735 64.21 15.68
950 1.194 0.3705 66.06 15.82
1000 1.213 0.3650 69.72 16.11
Table 9. MAX2642/MAX2643 Typical Noise Parameters
(RBIAS = 1.1kΩ, high-gain mode, VCC = +3.0V, TA= +25°C.)
FREQUENCY
(MHz)
NFMIN
(dB)
Γopt
MAG
Γopt PHASE
(DEGREES)
RN
(Ω)
800 1.312 0.4473 55.50 17.64
850 1.325 0.4391 59.12 17.83
875 1.333 0.4353 60.96 17.96
900 1.342 0.4317 62.79 18.11
925 1.352 0.4282 64.63 18.26
950 1.363 0.4249 66.46 18.43
1000 1.385 0.4186 70.08 18.78
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
14 ______________________________________________________________________________________
Table 10. Gain Selection and Shutdown
Modes
PART
CONTROL
VOLTAGE = VCC
CONTROL
VOLTAGE = 0
MAX2642 Low Gain High Gain
MAX2643 Enabled Shutdown
MAX2642
BIAS
RBIAS RBIAS
(A)
MAX2642
BIAS
(B)
Figure 1. MAX2642 Recommended Shutdown Configurations
Chip Information
TRANSISTOR COUNT: 158
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
______________________________________________________________________________________ 15
Package Information
SC70, 6L.EPS
MAX2642/MAX2643
900MHz SiGe, High IP3,
Low-Noise Amplifiers
16 ______________________________________________________________________________________
NOTES
