Datasheet MAX2611EUS Datasheet (Maxim)

19-1094; Rev 0; 6/96

EVALUATION KIT

AVAILABLE

DC-to-Microwave, Low-Noise Amplifier

_______________General Description

The MAX2611 is a low-voltage, low-noise amplifier for
use from DC to microwave frequencies. Operating from
a single +5V supply, it has a 3dB bandwidth of
1100MHz. The MAX2611’s low noise figure and high
drive capability make it ideal for a variety of transmit,
receive, and buffer applications.

In a typical application, the only external components
needed are input and output blocking capacitors and
a VCCseries resistor. To improve gain and output
power, an RF choke can be added in series to the bias
resistor.

The MAX2611 comes in a 4-pin SOT143 package,
requiring minimal board space.

________________________Applications

Satellite Receivers
TV Tuners
Wireless Local Loops
ISM Radios
Global Positioning Systems
Wireless Local-Area Networks
Land Mobile Radios
Set-Top Boxes

__________Typical Operating Circuit

____________________________Features

♦ Single +5V Supply Operation
♦ 3dB Bandwidth: DC to 1100MHz
♦ High Gain: 18dB at 500MHz
♦ Low Noise Figure: 3.5dB at 500MHz
♦ High Drive Capability: +3dBm at 16mA I

D

♦ Ultra-Small SOT143 Package

________________Ordering Information

PART

MAX2611EUS -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

4 SOT143

__________________Pin Configuration

MAX2611

V

C

BYP

(OPTIONAL)

OUT

CC

R

BIAS

L

CHOKE

(OPTIONAL)

OUT

C

BLOCK

GND

MAX2611

________________________________________________________________

GND

IN

C

IN

BLOCK

TOP VIEW

OUT

3

MAX2611

GND

21IN

SOT143

Maxim Integrated Products

GND

4

1

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

DC-to-Microwave, Low-Noise Amplifier

ABSOLUTE MAXIMUM RATINGS

I

.........................................................................................40mA

D

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

Continuous Power Dissipation (T

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

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.

= +70°C)

A

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

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

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

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

MAX2611

ELECTRICAL CHARACTERISTICS

(ID= 16mA, Z0= 50Ω, fIN= 500MHz, TA= +25°C, unless otherwise noted.)

CONDITIONS

(Note 1)

Power Gain

Input Voltage Standing-Wave
Maximum Ratio

Output Voltage Standing-Wave
Maximum Ratio

Device Voltage V

Device Voltage
Temperature Coefficient

fIN= 100MHz
fIN= 500MHz 17.3 18.3

= 100MHz to 500MHz

f

IN

fIN= 100MHz to 1500MHz

fIN= 100MHz to 1500MHz

TA= T

MIN

to T

(Note 2) 3.25 3.8 4.26

MAX

19.0

1.9:1

1.6:1

3.5 3.8 4.0

UNITSMIN TYP MAXPARAMETER

°C-40 85Operating Temperature Range
dB
dB±0.3Gain Flatness

MHz11003dB Bandwidth

dBm2.9Output 1dB Compression Point

dB3.5Noise Figure

dBm13Output IP3

ps210Group Delay

mV/°C-6.1

Note 1: Parts are designed to operate over specified temperature range. Specifications are production tested and guaranteed

at +25°C.

Note 2: Guaranteed by design, not tested.

2 _______________________________________________________________________________________

DC-to-Microwave, Low-Noise Amplifier

__________________________________________Typical Operating Characteristics

(ID = 16mA, Z0= 50Ω, fIN= 500MHz, TA= +25°C, unless otherwise noted.)

25

GAIN vs. FREQUENCY

20

15

GAIN (dB)

10

5

0

0.05 0.10 0.30 0.50 1.00
FREQUENCY (GHz)

NOISE FIGURE (dB)

TA = -40°C

TA = +85°C

NOISE FIGURE vs. FREQUENCY

7

6

5

4

3

3.00 6.00

TA = +85°C

TA = +25°C

TA = -40°C

MAX2611-01

VOLTAGE STANDING-WAVE RATIO

vs. FREQUENCY

5:1

4:1

3:1

VSWR

2:1

1:1

0.05 0.10 0.30 0.50 1.00
FREQUENCY (GHz)

MAX2611-04

IN

OUT

3.00 6.00

25

20

15

GAIN (dB)

10

5

MAX2611-02

(dBm)

-1

P

GAIN vs. CURRENT

0.16GHz

OUTPUT 1dB COMPRESSION 

POINT vs. FREQUENCY

5

4

3

2

1

0

TA = +85°C

TA = -40°C

0.1 0.2 0.3 0.4

1.0GHz

2.0GHz

FREQUENCY (GHz)

0.5GHz

TA = +25°C

0.5

MAX2611-05

1.0 2.0

MAX2611

MAX2611-03

2

0.2

0.1

0.3 0.4 0.5

FREQUENCY (GHz)

1.0 2.0

0

10 15 20 25

ID(mA)

30

35

_______________________________________________________________________________________

3

DC-to-Microwave, Low-Noise Amplifier

______________________________________________________________Pin Description

PIN

1

2, 4 GND

MAX2611

3

NAME FUNCTION

IN

OUT

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

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

Amplifier Output. Use a series blocking capacitor with less than 3Ω reactance at your lowest operat­ing frequency. Bias with an external resistor and an optional RF choke.

Table 1. Typical Scattering Parameters

(ID= 16mA, Z0= 50Ω, TA= +25°C)

FREQUENCY

(GHz)

0.1

0.2

0.3

0.4

0.5

0.6

0.8

1.0

1.5

2.0

2.5

3.0

3.5 0.24 -64 3.0 1.41 13 -21.4 0.086 30 0.19 47 3.83

4.0

S11

(mag)

0.12

0.11

0.13

0.14

0.15

0.15

0.13

0.12

0.32

0.31

0.32

0.20

0.31 -68 -0.7 0.92 17 -23.0 0.070 35 0.24 82 6.66

S11

(ang)

-11

-44

-58

-78

-89
77
50
16

-60

-72

-76

-70

S21
(dB)

19.0

18.8

18.6

18.5

18.3

18.1

17.4

16.6

14.1

10.3

7.9

5.9

S21

(mag)

8.90

8.73

8.53

8.43

8.26

7.99

7.45

6.79

5.07

3.27

2.48

1.98

S21

(ang)

173
166
158
151
144
137
123
109

79
59
47
32

S12

(dB)

-22.6

-21.9

-21.6

-21.6

-21.6

-21.6

-21.6

-20.9

-21.8

-22.2

-22.6

-22.3

S12

(mag)

0.074

0.081

0.083

0.083

0.083

0.083

0.083

0.090

0.081

0.078

0.074

0.077

S12

(ang)

2
4
5
6
7

9
10
10
11
18
25
37

S22

(mag)

0.05

0.03

0.04

0.06

0.08

0.09

0.10

0.10

0.21

0.22

0.26

0.24

S22

(ang)

53
12
45
32
34
26
23
35

-86

-72

-53

-29

K

1.08

1.06

1.05

1.06

1.06

1.07

1.10

1.11

1.29

1.87

2.44

3.10

4 _______________________________________________________________________________________

DC-to-Microwave, Low-Noise Amplifier

_______________Detailed Description

The MAX2611 is a broadband amplifier with flat gain
and 50Ω input and output ports. Its small size and sim­ple bias circuitry make it ideal for applications where
board space is limited.

__________Applications Information

As shown in the
MAX2611 is easy to use. Input and output series
capacitors may be necessary to block DC bias volt­ages (generated by the MAX2611) from interacting with
adjacent circuitry. These capacitors must be large
enough to contribute negligible reactance in a 50Ω
system at the minimum operating frequency. Use the
following equation to calculate their minimum value:

C

BLOCK

where f (in MHz) is the minimum operating frequency.
Bias current is supplied to the MAX2611 through an

external resistor and optional RF choke connected
between V
from VCCto GND may be necessary to isolate the V
line from other circuitry. The resistor value determines
the bias current from the following equation:

and the OUT pin. A bypass capacitor

CC

External Components

Typical Operating Circuit

53,000

=

V

CC

I

=

D

R

f

- V

BIAS

(pF)

D

, the

CC

Proper grounding of the GND pins is essential. If the

Grounding

PC board uses a topside RF ground, the GND pins
should be connected directly to it. For a board where
the ground plane is not on the component side, the
best technique is to connect the GND pins 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. This board satisfies all the
above requirements.

MAX2611

where V
An optional RF choke can be added to improve the

MAX2611’s gain and output power. The choke should
be large enough to reduce the loading effect that the
bias resistor has on the amplifier output. This is a func­tion of R
impedance.

is the device voltage, nominally 3.8V.

D

, frequency of operation, and output

BIAS

_______________________________________________________________________________________ 5

EXPANDED VIEW

Figure 1. Example PC Board Layout

DC-to-Microwave, Low-Noise Amplifier

__________________________________________________Tape-and-Reel Information

4.0 ±0.1

1.5 +0.1/-0.0 DIAMETER

MAX2611

1.0 ±0.1

2.0 ±0.05

A

1.75 ±0.1

3.5 ±0.05

8.0 ±0.3

2.2 ±0.1
MARKING

0.5 RADIUS
TYPICAL

0.30 ±0.05

0.8 ±0.05

0.30R MAX.

A0

A

NOTE: DIMENSIONS ARE IN MM.
AND FOLLOW EIA481-1 STANDARD.

Bo

4.0 ±0.1

Ao = 3.1mm ±0.1
Bo = 2.7mm ±0.1

Ko

Ko = 1.2mm ±0.1


†

ICs MAY ALSO BE MARKED WITH FULL PART NAME: 2611

1.0 MINIMUM

INFORMATION

X X X X

DF = MAX2611


LOT SPECIFIC
CODE

________________________________________________________Package Information

D

0°-8°

A

A1

e1

B

I

DIM



MIN

A

0.031

A1

0.001

B

C

0.014

B1

0.030

C

0.0034

D

0.105

E

0.047

e

0.070

e1

0.071

H

0.082

I

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

MILLIMETERSINCHES

MIN

0.787

0.025

0.356

0.762

0.086

2.667

1.194

1.778

1.803

2.083

0.102

†

21-0052A

MAX

1.194

0.127

0.559

0.965

0.152

3.048

1.397

2.032

2.007

2.489

0.305

E

H

4-PIN SOT143

SMALL-OUTLINE

TRANSISTOR PACKAGE

B1

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

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e