Rainbow Electronics MAX2643 User Manual

General Description

The MAX2642/MAX2643 low-cost, high third-order inter­cept 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 reduc­ing the number of external components.

The MAX2642/MAX2643 are designed on a low-noise,
advanced silicon-germanium (SiGe) process technolo­gy. 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

Pin Configuration

19-1682; Rev 0; 4/00

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

6 SC70-6

PIN­PACKAGE

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

V

CC

V

CC

47pF

R

BIAS

510Ω

RF
OUTPUT

33k
(10k)

LOW GAIN

(ENABLE)

HIGH GAIN
(SHUTDOWN)

BIAS

Typical Operating Circuit

TOP VIEW

16RFOUT

BIAS

GND

RFIN

MAX2642

2

MAX2643

34

5 GND

V

CC

SC70-6

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, high­gain mode. Typical values are at V

CC

= 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 V

CC

= 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.

VCCto 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

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage 2.7 5.5 V

High-gain mode, R

BIAS

= 510Ω, TA = +25°C 5.3 6.7

R

BIAS

= 510Ω, TA = -40°C to +85°C 7.5

R

BIAS

= 806Ω 3.6

R

BIAS

= 1.1kΩ 2.8

Operating Supply Current

Low-gain mode, R

BIAS

= 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

Supply Voltage 2.7 5.5 V

Operating Supply Current

Shutdown Supply Current Shutdown mode (see Applications Information) 0.2 10 µA

Shutdown Control Input Voltage

Shutdown Control Input Current

PARAMETER CONDITIONS MIN TYP MAX UNITS

R

= 510Ω, TA = +25°C 5.1 6.5

BIAS

R

= 510Ω, TA = -40°C to +85°C 7.3

BIAS

R

= 806Ω 3.4

BIAS

R

= 1.1kΩ 2.6

BIAS

Normal operation (Note 10) 2.0

Shutdown mode (Note 11) 0.6

Normal operation (Note 7) 0 10
Shutdown mode (Note 6) -5 5

mA

V

µA

MAX2642/MAX2643

900MHz SiGe, High IP3,

Low-Noise Amplifiers

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2642/MAX2643 EV kits, P

RFIN

= -30dBm, f

RFIN

= 900MHz, input and output are terminated to 50Ω, VCC= +3.0V, TA= +25°C,

R

BIAS

= 510Ω, unless otherwise noted.) (Note 12)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

Operating Frequency Range (Note 13)

MHz

Gain (Note 14) TA = +25°C

19 dB

Gain Variation Over Temperature

TA = -40°C to +85°C

dB

Attenuation Step MAX2642 only 13 dB

R

BIAS

= 510Ω 0

R

BIAS

= 806Ω -5

Input Third-Order Intercept Point
(Note 15)

R

BIAS

= 1.1kΩ -10

dBm

-18

Input 1dB Compression Point

MAX2642, low-gain mode -17

dBm

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 33kΩ resistor.
Note 3: Low-gain mode is applicable only to the MAX2642 and is set by connecting RFOUT to V

CC

through a 33kΩ resistor.

Note 4: Maximum DC voltage through a 33kΩ resistor that sets the MAX2642 to operate in high-gain mode.
Note 5: Minimum DC voltage through a 33kΩ resistor that sets the MAX2642 to operate in low-gain mode.
Note 6: DC current required when RFOUT is connected to GND through a 33kΩ resistor (MAX2642) and 10kΩ resistor (MAX2643).
Note 7: DC current required when RFOUT is connected to V

CC

through a 33kΩ resistor (MAX2642) and 10kΩ resistor (MAX2643).

Note 8: Normal operation is set for the MAX2643 by connecting RFOUT to V

CC

through a 10kΩ resistor.

Note 9: Shutdown is set for the MAX2643 by connecting RFOUT to GND through a 10kΩ resistor.
Note 10: Minimum DC voltage through a 10kΩ resistor that sets the MAX2643 to operate in normal mode.
Note 11: Maximum DC voltage through a 10kΩ resistor 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 T

A

= +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 T

A

= +25°C.

Note 15: Measured with two input tones, f

1

= 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).

800 1000

14.5 16.7

±0.35 ±0.75

1.35

MAX2642/MAX2643

900MHz SiGe, High IP3,
Low-Noise Amplifiers

4 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX2642/MAX2643 EV kits, VCC= +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.)

-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. R

BIAS

(HIGH GAIN)

MAX2642/43-01

R

BIAS

(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. R

BIAS

(LOW GAIN)

MAX2642/43-02

R

BIAS

(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

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. R

BIAS

MAX2642/43-05

R

BIAS

(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)

P

OUT

(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. R

BIAS

MAX2642/43-07

R

BIAS

(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

Typical Operating Characteristics (continued)

(MAX2642/MAX2643 EV kits, VCC= +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

14.0
MATCHED AT 900MHz

13.8

13.6

13.4

13.2

13.0

ATTENUATION STEP (dB)

12.8

12.6

800 880840 920 960820 900860 940 980 1000

FREQUENCY (MHz)

MAX2642/43-10

REVERSE ISOLATION vs. FREQUENCY

0

MATCHED AT 900MHz

-5

-10

-15

-20

RETURN LOSS (dB)

-25

-30

-35
800 880840 920 960820 900860 940 980 1000

FREQUENCY (MHz)

16

14

12

10

SUPPLY CURRENT (mA)

SUPPLY CURRENT vs. R

TA = +85°C, LOW GAIN

TA = +85°C, HIGH GAIN

TA = +25°C, LOW GAIN

8

6

4

2

TA = -40°C, HIGH GAIN

0

0 400 600200 800 1000 1200 1400 1600

TA = +25°C, HIGH GAIN

LOW GAIN

HIGH GAIN

TA = -40°C, LOW GAIN

R

(Ω)

BIAS

BIAS

MAX2642/43-13

MAX2642/43-16

RETURN LOSS vs. FREQUENCY

(HIGH GAIN)

0

MATCHED AT 900MHz

-5

-10

-15

-20

-25

ATTENUATION STEP (dB)

-30

-35
800 880840 920 960820 900860 940 980 1000

INPUT

OUTPUT

FREQUENCY (MHz)

MAX2642

HIGH/LOW-GAIN SWITCH

CHARACTERISTICS

0

-10

-20

-30

-40

OUTPUT POWER (dBm)

-50

-60

3V

0V

TIME (400ns/div)

SHUTDOWN CURRENT

vs. TEMPERATURE

10

1

0.1

0.01

SHUTDOWN CURRENT (µA)

0.001

0.0001

-40 -20 0 20 40 60 80 100

VCC = 5.5V

VCC = 3.0V

TEMPERATURE (°C)

RETURN LOSS vs. FREQUENCY

0

MATCHED AT 900MHz

-5

MAX2642/43-11

-10

-15

-20

RETURN LOSS (dB)

-25

-30

-35
800 880840 920 960820 900860 940 980 1000

SHUTDOWN CHARACTERISTICS

0

-10

MAX2642/43-14

-20

-30

-40

-50

-60

V

RFOUT

OUTPUT POWER (dBm)

-70

-80

-90

V

vs. SUPPLY VOLTAGE

8.0
TA = +85°C, LOW GAIN

7.6

MAX2642/43-17

7.2

TA = +85°C, HIGH GAIN

6.8

6.4

6.0
TA = +25°C, HIGH GAIN

5.6

5.2

SUPPLY VOLTAGE (mA)

TA = -40°C, LOW GAIN

4.8

4.4

4.0

2.4 3.2 3.62.8 4.0 4.4 4.8 5.2 5.6

MAX2642

(LOW GAIN)

FREQUENCY (MHz)

MAX2643

RFOUT

TIME (4µs/div)

3V

SUPPLY CURRENT

TA = +25°C, LOW GAIN

SUPPLY VOLTAGE (V)

OUTPUT

INPUT

TA = -40°C,
HIGH GAIN

0V

MAX2642/43-12

MAX2642/43-15

MAX2642/43-18

MAX2642/MAX2643

900MHz SiGe, High IP3,
Low-Noise Amplifiers

6 _______________________________________________________________________________________

Pin Description

PIN NAME FUNCTION

1 BIAS

Resistor Bias Control. Connect a resistor, R

BIAS

, from BIAS to ground. R

BIAS

sets IP3 and supply
current (see Applications Information). The current through this pin is approximately 50mV divided
by R

BIAS

.

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 V

CC

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 transmis­sion line. The Typical Operating Circuit shows the rec­ommended 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 net­work 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 33kΩ resistor 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 V

CC

pin. For long VCClines, 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 essen­tial. 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

(R

BIAS

= 510Ω, high-gain mode, VCC= +3.0V, TA= +25°C.)

FREQ

(MHz)

S11 MAG

S11 PHASE

S21 MAG

S21 PHASE

S12 MAG

S12 PHASE

S22 MAG

S22 PHASE

(DEGREES)

500

-69.5831

-119.18

-74.01422

600

-83.7622

-136.451

-98.95091

700

-97.3356

-161.126 0.02988

-125.1027

800 0.73798 -108.682

-142.0387

820

-110.578 5.286

132.505

-141.9486

840

-112.499

-139.9869

860

-114.276

-133.8375

880

-115.973

-121.3533

900

-117.585

128.075

-102.3972

920

-119.117

0.06007

-81.32555

940

-120.995

0.04301

-62.51575

960 0.68522 -122.642

-50.8638

980

-124.345

0.04524

-44.30662

1000

-126.035

-40.69565

1100

-134.195 4.29304

-34.00603

1200

-141.558

-32.62157

1300

-147.886

103.583

-33.12784

1400

-153.992

-36.62076

1500

-158.21

-40.68451

0.832641

0.825168

0.785389

0.728099

0.718704

0.711335

0.705742

0.699509

0.695913

0.690406

0.681722

0.675328

0.657582

0.635999

0.616881

0.602418

0.587409

(DEGREES)

2.390806

3.836967

4.983279

5.320575 174.5337 0.036197 134.8794 0.215462

5.241719 166.3987 0.037266 129.1671 0.135415

5.185213 162.4763 0.039143 128.0447 0.100779

5.118265 158.9238 0.039563 128.4158 0.076864

5.050356 155.6292 0.042586

4.973824 152.4338 0.041805 126.9362

4.897571 149.4286

4.826106 146.6999 0.046528 122.0997 0.077374

4.735407 143.8275

4.650673 141.4611 0.046036 120.1779 0.103072

3.998256 121.5475 0.061434 109.6365 0.198686

3.777511 113.2893 0.066092

3.547677 105.6808 0.075756 99.08275 0.283245

3.338385 97.62961 0.076491 92.84421 0.326279

(DEGREES)

0.010763 166.6047 0.878515

0.019608 167.8741 0.731997

170.3323 0.037193

130.7613 0.053825 116.4169 0.156945

(DEGREES)

148.5203 0.481344

0.171633

0.062918

122.9564 0.065287

121.0474 0.090494

0.240437

MAX2642/MAX2643

900MHz SiGe, High IP3,
Low-Noise Amplifiers

8 _______________________________________________________________________________________

Table 2. MAX2642/MAX2643 Typical Scattering Parameters

(R

BIAS

= 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

-67.5629

-115.899

600

-80.7084

-132.446

165.374

700

-94.1329

-157.426

0.49107

800

-104.428

820

-106.343

840 0.759 -108.042

169.298

860 0.7495 -109.928

880

-111.683

161.548 0.04118

900

-113.369

0.04194

920

-115.127

940

-116.951

960

-118.584

980

-120.313 3.83867

118.109

1000

-121.959 3.777

119.036

1100

-129.341

1200 0.67035 -136.703 3.27255

1300

-143.014 3.09574

0.26965

1400

-148.565

97.9223

1500

-153.536

0.865705

0.853946

0.820187

0.775557

0.765138

0.741722

0.736069

0.728957

0.724118

0.719676

0.714506

0.709103

0.691292

0.650556

0.635363

0.616202

1.788918

2.926709

3.884537

4.237314 177.9528 0.036728 130.1148 0.216415 -153.3392

4.226094 173.3886 0.038253 129.5942 0.166772 -157.7809

4.214913

4.182436 165.3457 0.040084 127.3742 0.082263 -160.9349

4.134814

4.085018 157.8688

4.032105 154.6118 0.044642 123.3553 0.021369 -38.41852

3.965561 151.3371 0.044574 121.8034 0.043243 -17.90431

3.903364 148.3141 0.044792 120.7695 0.066898 -14.20027

3.483283 131.8578 0.054775 114.7347 0.169693 -18.18657

2.934971 105.3286 0.075142

2.756155 96.43876 0.074664 92.88747 0.360706 -35.70454

0.009763 164.6001 0.880237 -73.81893

0.021656

0.029766 148.5047

0.038842 128.7876 0.121201 -160.7175

127.2791 0.045314 -158.0615

125.3719 0.016624 -133.0426

145.3527 0.045551

142.7001 0.046434

121.9156 0.061407 108.2008 0.220689 -21.72272

113.1691 0.064829 103.5856

0.739354 -99.52715

-128.1454

0.084163 -12.76007

0.102269 -13.88384

-24.86245

0.315264 -30.21604

MAX2642/MAX2643

900MHz SiGe, High IP3,

Low-Noise Amplifiers

_______________________________________________________________________________________ 9

Table 3. MAX2642/MAX2643 Typical Scattering Parameters

(R

BIAS

= 1.1kΩ, high-gain mode, VCC= +3.0V, TA= +25°C.)

FREQ
(MHz)

S11 MAG

S11 PHASE

S21 MAG

S11 PHASE

S12 MAG

S12 PHASE

S22 MAG

S22 PHASE

(DEGREES)

500

-66.0475

-114.652

-73.97408

600 0.86813 -79.0081

-131.281 0.01977

-100.0799

700

-91.9431

-155.869

-129.8978

800

-102.384

-160.5161

820

-104.098

-166.8809

840

-105.921

-173.2415

860

-107.766

165.871 0.04004

178.6352

880

-109.461

167.1237

900

-111.254

128.5957

920

-113.148

48.71712

940

-114.988 3.36768

0.04661 18.5372

960

-116.709

10.02515

980

-118.379

118.374

4.197083

1000

-119.87

-0.293905

1100

-127.286

-10.46082

1200

-134.781

-16.81635

1300

-141.275

-21.34393

1400

-146.685

-27.6725

1500

-152.12

-33.81158

0.878512

0.834311

0.793611

0.783644

0.774329

0.767016

0.762463

0.753622

0.748921

0.743011

0.737437

0.733572

0.729122

0.710864

0.688941

0.668471

0.655478

0.638124

(DEGREES)

1.445864

2.398259

3.218232

3.544617 179.1002 0.038594 131.9641 0.223248

3.563583 174.4488 0.040112 131.6111 0.173175

3.546937 170.1934 0.038383 128.1902 0.126351

3.529998

3.500193 161.8438 0.041375 124.4402 0.049822

3.463616 158.0655 0.043587 123.8527 0.020398

3.419726 154.6982 0.043975 123.9237 0.024778

3.309045 148.0373 0.044426 118.9012 0.070736

3.261195 145.4087 0.046581

3.203007 142.5148 0.048343 116.9249 0.110062

2.970843 130.8328 0.055616 115.1579 0.183756

2.789044 120.5809 0.061803 105.9973 0.238134

2.637086 111.4044 0.065281 100.6171 0.289607

2.491515 103.3737 0.073887 96.84646 0.335752

2.352013 94.07729 0.077901 90.34502 0.381179

(DEGREES)

0.011049 175.9688 0.882121

0.033312 149.3926 0.502282

151.2749 0.045614 121.0385

(DEGREES)

166.0087 0.745577

126.4807 0.086328

0.092621

MAX2642/MAX2643

900MHz SiGe, High IP3,
Low-Noise Amplifiers

10 ______________________________________________________________________________________

Table 4. MAX2642 Typical Scattering Parameters

(R

BIAS

= 510Ω, low-gain mode, VCC= +3.0V, TA= +25°C.)

FREQ
(MHz)

S11 MAG

S11 PHASE

S21 MAG

S21 PHASE

S12 MAG

S12 PHASE

S22 MAG

S22 PHASE

(DEGREES)

500

-68.0641

-175.019

0.87996 -73.8882

600 0.75734 -84.3042

-146.702

0.71413 -98.6736

700

-98.422

-174.61

-121.361

800

-107.497

-127.267

820

-108.596

152.644

-123.451

840

-109.794

-116.955

860

-110.754

-107.057

880

-111.776 1.22394

-93.617

900

-112.739

-81.5882

920

-113.712

86.9857

-70.2192

940

-114.834

128.909

-61.7886

960

-115.806

-55.1485

980

-116.828

-52.3827

1000

-117.975

0.12743

-48.4917

1100

-124.002

-43.8143

1200 0.6066 -129.873

99.7348

-43.9084

1300

-136.272

-46.8967

1400

-142.195

85.7905

0.33692 -51.7496

1500

-147.446

-56.7658

(DEGREES)

0.757279

0.696969

0.626874

0.616023

0.608751

0.600617

0.596488

0.593722

0.590101

0.588409

0.589625

0.588079

0.588646

0.597562

0.617079

0.628195

0.640304

0.186886

0.715305

1.140352

1.272844 157.4571 0.115242 103.1406 0.201112

1.267541

1.258504 148.0772 0.117601 97.74948 0.137812

1.242296 143.7583 0.119312 95.48379 0.118557

1.203776 135.9799 0.124196 90.21815 0.103446

1.181885 132.3471 0.125203

1.156787

1.129734 125.6671 0.127369 82.07469 0.129083

1.102653 122.5478 0.127952 80.98836 0.140436

1.074686 119.9067

0.952505 108.5103 0.134236 72.42102 0.206216

0.852237

0.778154 92.06538 0.142609 58.40858 0.295689

0.718399

0.656535 78.77735 0.149518 46.71009 0.374046

(DEGREES)

0.032297 163.9787

0.066113 148.5775

0.099941 124.8504 0.449346

0.116521 100.3007 0.165909

139.7228 0.122318 93.07481 0.106845

0.126462 84.27329 0.116508

0.138354 65.08001 0.252003

0.153771 52.64912

(DEGREES)

0.108109

79.48192 0.151608

MAX2642/MAX2643

900MHz SiGe, High IP3,

Low-Noise Amplifiers

______________________________________________________________________________________ 11

Table 5. MAX2642 Typical Scattering Parameters

(R

BIAS

= 806Ω, low-gain mode, VCC= +3.0V, TA= +25°C.)

FREQ
(MHz)

S11 PHASE

S21 PHASE

S12 PHASE

S22 PHASE

(DEGREES)

500

-67.1945

-174.341

161.583 0.88084

-73.57176

600

-81.9096

-143.848

-99.08562

700

-95.21

-171.542

-124.5513

800

-103.586

-136.0146

820

-104.763

-133.6185

840

-106.009

-125.307

860

-107.125

-112.6535

880

-108.175

-92.15154

900

-109.302

0.0738

-70.16955

920

-110.728

-54.68721

940

-111.842

-46.62902

960

-113.103 0.90238

0.12394

-40.63098

980

-114.555

-38.28101

1000

-115.739

-35.93101

1100

-121.754

109.613

-35.70716

1200

-128.101

-37.84105

1300 0.65637 -134.578

93.1824

-41.83445

1400

-139.905

51.5965 0.34549

-46.96146

1500

-145.73 0.53929

-52.44192

S11 MAG

0.800327

0.793203

0.736656

0.676741

0.666567

0.660377

0.651791

0.651106

0.643048

0.643064

0.641773

0.640079

0.641175

0.641025

0.647379

0.651053

0.662035

0.665418

(DEGREES)

S21 MAG

0.142134

0.543072

0.885917

1.005172 159.8524 0.114894 101.0446 0.183694

1.005053 154.9507 0.115809 97.08399 0.143872

0.998032 150.1753 0.118042 94.72314 0.109486

0.990225 145.7345 0.118937 91.64486 0.085206

0.978178 141.4141 0.121575 89.19647 0.071836

0.961026 137.4554 0.120654 86.75212

0.942776 133.7632 0.123645 83.74419 0.084769

0.923851 130.1361 0.123333 80.71953 0.098778

0.879907 123.7699 0.123001 76.38534 0.132356

0.857382 120.9598 0.122316 74.64619 0.145883

0.760331

0.685309 100.4887 0.131962 62.04964 0.260554

0.623917

0.582929 86.98415 0.142149

(DEGREES)

126.9098

79.50793 0.138295 45.87176 0.382116

S12 MAG

0.034805

0.067027 146.5234 0.719105

0.101665 122.4962 0.449898

0.127968 68.72507 0.209937

0.132337 56.01043 0.303628

(DEGREES)

78.64308 0.117484

S22 MAG

MAX2642/MAX2643

900MHz SiGe, High IP3,
Low-Noise Amplifiers

12 ______________________________________________________________________________________

Table 6. MAX2642 Typical Scattering Parameters

(R

BIAS

= 1.1Ω, low-gain mode, VCC= +3.0V, TA= +25°C.)

FREQ
(MHz)

S11 MAG

S11 PHASE

S21 MAG

S21 PHASE

S12 MAG

S12 PHASE

S22 MAG

S22 PHASE

(DEGREES)

500

-66.5029

-174.275 0.03386

-73.74798

600

-80.314

-143.103

-99.6653

700

-93.0574 0.72921 -170.915 0.0999

-126.0206

800

-101.403

-141.9359

820

-102.693

-140.7761

840

-103.96

150.551

-136.1769

860

-105.16 0.82921

-122.4536

880

-106.424

-93.92001

900

-107.654

-64.05054

920

-109.092

-44.45571

940

-110.488

-37.15094

960

-111.738

-31.16879

980

-113.266

-29.76813

1000

-114.649

0.11967

0.14489 -28.6178

1100

-120.914

0.21152

-30.89364

1200

-127.763

-34.10688

1300

-134.523 0.52948

-38.78385

1400

-139.869

-44.59462

1500

-145.854

79.4068

-50.022

(DEGREES)

0.822139

0.808058

0.755255

0.703243

0.694461

0.687512

0.683106

0.678346

0.674815

0.672424

0.671111

0.669825

0.670457

0.669392

0.674741

0.675283

0.679379

0.682813

0.681251

0.116321

0.439837

0.838753 160.4014 0.115609 98.56961 0.181063

0.839017 155.3972 0.116069 94.64113 0.138616

0.836295

0.818297 141.5384 0.119552 86.39616 0.049577

0.807407 137.4799 0.121372 83.98519 0.052964

0.791395 133.7297 0.122328 80.33097 0.070844

0.775375 129.9834 0.120584 78.46327 0.089595

0.757139 126.6652 0.120221 75.62165 0.110248

0.737655 123.3462 0.120881 73.65825 0.125584

0.719178 120.6109

0.638029 109.1083 0.123318 66.28802

0.575544 100.3768 0.125601 58.42145 0.264377

0.494615 86.94255 0.133067 49.83734 0.348366

0.462984

(DEGREES)

0.065964 146.0581 0.724703

0.117021 92.14834 0.098228

145.8221 0.116949 88.49732 0.068493

92.75184 0.126691 54.07481 0.308252

0.128294 43.41453 0.386044

(DEGREES)

162.1213 0.879442

121.1126 0.457496

71.31908

MAX2642/MAX2643

900MHz SiGe, High IP3,

Low-Noise Amplifiers

______________________________________________________________________________________ 13

Table 7. MAX2642/MAX2643 Typical Noise Parameters

(R

BIAS

= 510Ω, high-gain mode, VCC= +3.0V, TA= +25°C.)

FREQUENCY

(MHz)

NF

MIN

(dB)

Γ

opt

MAG

Γ

opt

PHASE

(DEGREES)

R

N

(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

(R

BIAS

= 806Ω, high-gain mode, VCC= +3.0V, TA= +25°C.)

FREQUENCY

(MHz)

NF

MIN

(dB)

Γ

opt

MAG

Γ

opt

PHASE

(DEGREES)

R

N

(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

(R

BIAS

= 1.1kΩ, high-gain mode, VCC= +3.0V, TA= +25°C.)

FREQUENCY

(MHz)

NF

MIN

(dB)

Γ

opt

MAG

Γ

opt

PHASE

(DEGREES)

R

N

(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 = V

CC

CONTROL

VOLTAGE = 0

MAX2642 Low Gain High Gain

MAX2643 Enabled Shutdown

Figure 1. MAX2642 Recommended Shutdown Configurations

Chip Information

TRANSISTOR COUNT: 158

BIAS

BIAS

R

BIAS

MAX2642

(A)

R

BIAS

MAX2642

(B)

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