MAXIM MAX2650 User Manual

_______________General Description

The MAX2650 is a low-noise amplifier for use from DC to microwave frequencies. Operating from a single +5V supply, it has a flat gain response to 900MHz. The MAX2650’s low noise figure and high drive capability make it ideal for a variety of transmit, receive, and buffer applications.

The device is internally biased, eliminating the need for external bias resistors or inductors. In a typical application, the only external components needed are input and output blocking capacitors and a V

CC

bypass

capacitor.

The MAX2650 comes in a 4-pin SOT143 package, requiring minimal board space.

________________________Applications

Wireless Local Loop

Global Positioning Systems (GPS)

ISM Radios

Special Mobile Radios

Wireless Local-Area Networks

Cellular Base Stations

Set-Top Boxes

____________________________Features

♦ Internally Biased

♦ High Gain: 18.3dB at 900MHz

♦ 3.9dB Noise Figure

♦ Single +4.5V to +5.5V Operation

♦ -1dBm Output 1dB Compression Power

♦ Low-Cost Silicon Bipolar Design

♦ Ultra-Small SOT143 Package

MAX2650

DC-to-Microwave,

+5V Low-Noise Amplifier

________________________________________________________________ Maxim Integrated Products 1

__________________Pin Configuration

V

CC

C

BYP

C

BLOCK

GND

OUT

V

CC

IN

C

BLOCK

IN

MAX2650

OUT

V

CC

GND

3

4

21IN

SOT143

TOP VIEW

MAX2650

__________Typical Operating Circuit

19-1135; Rev 1; 8/03

PART

MAX2650EUS-T -40°C to +85°C

TEMP RANGE PIN-PACKAGE

4 SOT143-4

EVALUATION KIT

AVAILABLE

______________Ordering Information

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX2650

DC-to-Microwave, +5V Low-Noise Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +5.0V, Z0= 50Ω, fIN= 900MHz, TA= +25°C, unless otherwise noted.)

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: Parts are designed to operate over specified temperature range. Specifications are production tested and guaranteed

at +25°C.

V

CC

to GND..............................................................-0.3V to +8V

Input Power ....................................................................+13dBm

Continuous Power Dissipation (T

A

= +70°C)

SOT143-4 (derate 4mW/°C above +70°C)...................320mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

(Note 1)

fIN= 800MHz to 1000MHz

fIN= 100MHz to 1000MHz

CONDITIONS

dB16.5 18.3 21Power Gain

°C-40 85Operating Temperature Range

15.5 17.7 20.0

V4.5 5.5Supply Voltage

ps300Group Delay

1.3:1Maximum Output Voltage Standing-Wave Ratio

dBm-1Output 1dB Compression Point

dBm10Output IP3

dB3.9Noise Figure

1.5:1Maximum Input Voltage Standing-Wave Ratio

UNITSMIN TYP MAXPARAMETER

TA= T

MIN

to T

MAX

13.0 17.7 22.0

VCC= 4.5V to 5.5V

mA

11.0 17.7 24.0

Supply Current

CAUTION! ESD SENSITIVE DEVICE

MAX2650

DC-to-Microwave, +5V Low-Noise Amplifier

_______________________________________________________________________________________ 3

__________________________________________Typical Operating Characteristics

(VCC= 5.0V, Z0= 50Ω, fIN= 900MHz, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

40

30

20

(mA)

CC

I

10

+25°C

0

4.0 6.0

4.5

GAIN (dB)

+85°C

-40°C

VCC (V)

25

20

15

10

5

MAX2650-01

5.55.0

GAIN vs. FREQUENCY

+25°C

OUTPUT 1dB COMPRESSION

POINT vs. FREQUENCY

5

3

1

(dBm)

-1

P

-1

-3

-5

0.1 0.3 1.5

+85°C

-40°C

0.5 FREQUENCY (GHz)

MAX2650-04

-40°C

+85°C

+25°C

1.31.10.90.7

25

20

15

GAIN (dB)

10

5

+5

MAX2650-02

+3

+1

(dBm)

-1

P

-1

-3

-5

GAIN vs. FREQUENCY

OUTPUT 1dB COMPRESSION

POINT vs. FREQUENCY

5.5V

5.0V

4.5V

0.1 0.3 1.5

0.5 FREQUENCY (GHz)

5.5V

4.5V

5.0V

1.31.10.90.7

MAX2650-05

MAX2650-03

0

0.1 0.3 1.5

0.5 FREQUENCY (GHz)

1.31.10.90.7

0

0.1 0.3 1.5

0.5 FREQUENCY (GHz)

1.31.10.90.7

VOLTAGE STANDING-WAVE RATIO

NOISE FIGURE vs. FREQUENCY

5

4

3

2

NOISE FIGURE (dB)

1

0

0.1 0.3 1.5

+85°C

-40°C

FREQUENCY (GHz)

+25°C

3.5:1

MAX2650-07

1.31.10.90.70.5

3.0:1

2.5:1

VSWR

2.0:1

1.5:1

1.0:1

0.1 0.3 1.5

vs. FREQUENCY

MAX2650-06

OUT

IN

1.31.10.90.70.5

FREQUENCY (GHz)

MAX2650

DC-to-Microwave, +5V Low-Noise Amplifier

4 _______________________________________________________________________________________

Table 1. Typical Scattering Parameters

(VCC= +5V, Z0= 50Ω, TA= +25°C.)

0.19

0.20

0.18

0.17

0.16

0.14

0.16

0.17

S11

(mag)

-86

-66

-54

-39

-26

-17

-7

0

8

9

-6

-3

S11

(ang)

15.7

17.4

18.0

18.6

19.0

19.3

19.5

19.6

19.7

19.8

S21

(dB)

6.10

7.40

7.92

8.46

8.93

9.21

9.43

9.52

9.70

9.69

9.72

9.76

S21

(mag)

51

73

84

95

107

119

129

140

151

161

172

177

S21

(ang)

-26.9

-28.7

-29.5

-31.1

-31.7

-32.3

-33.2

-33.8

1.20

-35.0

-35.8

-36.7

0.20

-37.8

S12

(dB)

0.045

0.10

0.037

0.033

0.05

0.028

0.026

0.024

0.022

1.00

0.020

0.018

0.016

0.90

0.015

0.013

S12

(mag)

0.80

52

50

48

0.70

44

41

37

0.30

34

32

28

0.40

23

14

8

0.50

S12

(ang)

0.05

0.10

0.60

0.13

0.17

0.21

FREQUENCY

(GHz)

0.25

0.28

0.32

0.35

0.37

0.39

0.42

S22

(mag)

-49

-76

-71

-62

-53

-43

-34

-26

-19

-13

-6

-5

S22

(ang)

1.88

1.91

2.10

2.09

2.12

2.24

2.31

2.54

2.70

2.92

3.18

K

1.40 0.16 -86 13.4 4.69 31 -25.5 0.053 51 0.12 -12 2.03

1.60 0.15 -66 10.6 3.40 14 -24.4 0.060 44 0.24 -17 2.32

1.80 0.22 -40 7.4 2.35 5

-24.4

0.060 32 0.35 -27 3.01

2.00 0.33 -36 4.6 1.70 4 -25.3 0.055 22 0.43 -33 3.97

2.20 0.41 -38 3.1 1.43 6 -26.5 0.047 21 0.46 -33 4.85

2.40 0.44 -37 2.5 1.34 6 -28.6 0.037 22 0.49 -29 6.26

2.50 0.44 -37 2.3 1.30 4 -29.5 0.034 22 0.49 -25 7.05

______________________________________________________________Pin Description

NAME FUNCTION

1

IN

Amplifier Input. Use a series blocking capacitor with less than 3Ω reactance at your lowest operating frequency.

2 GND

Ground Connection. For optimum performance, provide a low-inductance connection to the ground plane.

3

OUT

Amplifier Output. Use a series blocking capacitor with less than 3Ω reactance at your lowest operating frequency.

4

V

CC

Supply Connection. Bypass directly at the package pin. The value of the bypass capacitor is determined by the lowest operating frequency and is typically the same as the blocking capacitor value. For long VCClines, additional bypassing may be necessary.

_______________Detailed Description

The MAX2650 is a broadband amplifier with flat gain and 50Ω input and output ports. Its small size and internal bias circuitry make it ideal for applications where board space is limited.

__________Applications Information

External Components

As shown in the Typical Operating Circuit, the MAX2650 is easy to use. Input and output series capacitors may be necessary to block DC bias voltages (generated by the MAX2650) from interacting with adjacent circuitry. These capacitors must be large enough to contribute negligible reactance in a 50Ω sys- tem at the minimum operating frequency. Use the following equation to calculate their minimum value:

where f (in MHz) is the minimum operating frequency.

The V

CC

pin must be RF bypassed for correct operation. To accomplish this, connect a capacitor between the V

CC

pin and ground, as close to the package as is practical. Use the same equation given above (for DC blocking capacitor values) to calculate the minimum capacitor value. If there are long VCClines on the PC board, additional bypassing may be necessary. This may be done further away from the package, at your discretion.

Proper grounding of the GND pin is essential. If the PC board uses a topside RF ground, the GND pin should connect directly to it. For a board where the ground plane is not on the component side, the best technique is to connect the GND pin to it through multiple plated through-holes.

PC Board Layout Example

An example PC board layout is given in Figure 1. It uses FR-4 with 31mil layer thickness between the RF lines and the ground plane. The board satisfies all the above requirements.

C

BLOCK

=

53,000

f

(pF)

MAX2650

DC-to-Microwave, +5V Low-Noise Amplifier

_______________________________________________________________________________________ 5

Figure 1. Example PC Board Layout

EXPANDED VIEW

RF IN

RF OUT

MAX2650

V

CC

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

6 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600

MAX2650

DC-to-Microwave, +5V Low-Noise Amplifier

________________________________________Tape-and-Reel/Marking Information

4-PIN SOT143-4

SMALL-OUTLINE

TRANSISTOR PACKAGE

A

A1

C

D

E

e

e1

B

H

I

B1

MILLIMETERSINCHES

MIN

0.787

0.025

0.356

0.762

0.086

2.667

1.194

1.778

1.803

2.083

0.102

MAX

1.194

0.127

0.559

0.965

0.152

3.048

1.397

2.032

2.007

2.489

0.305

MIN

0.031

0.001

0.014

0.030

0.0034

0.105

0.047

0.070

0.071

0.082

0.004

MAX

0.047

0.005

0.022

0.038

0.006

0.120

0.055

0.080

0.079

0.098

0.012

DIM

A

A1

B

B1

C D E e

e1

H

I

0°-8°

21-0052A

4.0 ±0.1

0.30 ±0.05

0.8 ±0.05

0.30R MAX.

B

o

Ko

2.2 ±0.1

0.5 RADIUS TYPICAL

A0

4.0 ±0.1

2.0 ±0.05

1.5 +0.1/-0.0 DIAMETER

1.75 ±0.1

1.0 ±0.1

A

8.0 ±0.3

3.5 ±0.05

1.0 MINIMUM

A

DH = MAX2650

Ao = 3.1mm ±0.1 Bo = 2.7mm ±0.1 Ko = 1.2mm ±0.1

X X X X

LOT SPECIFIC CODE

MARKING

INFORMATION

NOTE: DIMENSIONS ARE IN MM.

AND FOLLOW EIA481-1 STANDARD.

ICs MAY ALSO BE MARKED WITH FULL PART NAME: MAX2650

†

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages

.)

MAXIM MAX2650 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual