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