MAXIM MAX2472, MAX2473 Technical data

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General Description

The MAX2472/MAX2473 are flexible, wideband, high­reverse-isolation buffer amplifiers. The MAX2472 has dual
open-collector outputs capable of delivering -5dBm into
50Ω while maintaining harmonic suppression below

-25dBc. The MAX2473 has a single open-collector output
with a bias control pin to vary output power from -10dBm
to -2dBm while maintaining harmonic suppression below

-25dBc. The MAX2472/MAX2473’s combination of high
reverse isolation and low supply current makes them ideal
for applications requiring high performance with low
power. They feature high input impedance and open-col­lector outputs for maximum flexibility, enabling them to be
used with a variety of oscillator topologies.

Both the MAX2472 and MAX2473 operate from a single
+2.7V to +5.5V supply. With VCC= +3.0V and -25dBm
input power, the MAX2472 consumes 5.2mA, while the
MAX2473 consumes only 2.7mA. Both devices are avail­able in a tiny 6-pin SOT23 package requiring minimal
board space.

Applications

Cellular and PCS Mobile Phones
Private Mobile Radios
ISM-Band Applications
IF/RF Oscillators
General-Purpose Buffers/Amplifiers

Typical Operating Circuits appear at end of data sheet.

Features

♦ +2.7V to +5.5V Supply Range
♦ 500MHz to 2500MHz Input Frequency Range
♦ High Reverse Isolation: 49dB at 900MHz
♦ Dual Open-Collector Outputs (MAX2472)
♦ Adjustable -10dBm to -2dBm Output Power

Control (MAX2473)

♦ High Input Impedance: >250Ω at 900MHz
♦ Ultra-Small SOT23-6 Package

MAX2472/MAX2473

500MHz to 2500MHz

VCO Buffer Amplifiers

________________________________________________________________

Maxim Integrated Products

1

Functional Diagrams

19-1466; Rev 0; 6/99

PART

MAX2472EUT-T
MAX2473EUT-T

-40°C to +85°C

-40°C to +85°C

TEMP.

RANGE

PIN-

PACKAGE

6 SOT23-6
6 SOT23-6

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

SOT

TOP MARK

AAAZ
AABA

GND

GND

OUT2

OUT1

IN

V

CC

MAX2472

BIAS

GND GND

BIAS

OUT

IN

V

CC

MAX2473

BIAS

Pin Configuration

TOP VIEW

OUT1 (OUT)

GND

( ) ARE FOR MAX2473.

16V

2

34

MAX2472
MAX2473

SOT23-6

CC

5 GND

IN OUT2 (BIAS)

MAX2472/MAX2473

500MHz to 2500MHz
VCO Buffer Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, PIN= -25dBm, IN driven from a 50Ω source, OUT_ LC-matched to 50Ω, TA= T

MIN

to T

MAX

, unless otherwise

noted. Typical values are at V

CC

= +3V, TA= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—MAX2472

(

Typical Operating Circuits

, VCC= +3V, PIN= -25dBm, IN driven from a 50Ω source, OUT1 and OUT2 LC matched to 50Ω, 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.

VCCto GND..............................................................-0.3V to +7V

OUT1, OUT2, BIAS to GND........................-0.3V to (VCC+ 0.3V)

Maximum BIAS Pin Current................................................150µA

Maximum Input Power....................................................+10dBm

Continuous Power Dissipation

SOT23-6 (derate 8.7mW/°C above +70°C)...................696mW

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

CONDITIONS

2.7
mA

5.2 8.0

I

CC

V2.7 5.5V

CC

Input Voltage Range

Supply Current

4.8

5.1

2.5

4.3

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX2473, R

BIAS

= 23kΩ

MAX2473, R

BIAS

= 11kΩ

MAX2472

No drive

MAX2472
MAX2473, R

BIAS

= 23kΩ

MAX2473, R

BIAS

= 11kΩ

dBm

S12

2

S21

2

fIN= 900MHz, TA= +25°C

Transducer Gain
(IN to OUT2)

fIN= 600MHz

fIN= 900MHz

dB

9.2

fIN= 900MHz

fIN= 2400MHz

fIN= 1900MHz

fIN= 600MHz

40

fIN= 1900MHz
fIN= 2400MHz

fIN= 900MHz

fIN= 900MHz, TA= T

MIN

to T

MAX

(Note 3)

CONDITIONS

dB

6.6 14.6

fIN= 600MHz 13.0

S21

2

fIN= 2400MHz 5.3

fIN= 1900MHz 6.8

Transducer Gain
(IN to OUT1)

dB

7.8 10.2 12.2

14.0

MHz500 2500f

IN

Input Frequency Range (Note 2)

26

30

43

Reverse Isolation
(IN to OUT2)

7.5

6.0

-3.2P

OUT1dB

Output 1dB Compression Point

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX2472/MAX2473

500MHz to 2500MHz

VCO Buffer Amplifiers

_______________________________________________________________________________________ 3

Note 1: Limits are 100% production tested at TA= +25°C. Limits over the entire operating temperature range are guaranteed by

design and characterization but are not production tested.

Note 2: This is the recommended operating frequency range. The parts have been characterized over the specified frequency

range and production tested at 900MHz. Operation outside of this range is possible but not guaranteed.

Note 3: Guaranteed by design and characterization.

P

OUT

= -5dBm, fIN= 900MHz

fIN= 900MHz

fIN= 1900MHz

fIN= 900MHz

CONDITIONS

dBc-25

dB24Isolation (OUT1 to OUT2)

10.2

9.5

NFNoise Figure

UNITSMIN TYP MAXSYMBOLPARAMETER

Harmonic Suppression

dB

fIN= 900MHz, TA= +25°C

fIN= 600MHz

fIN= 1900MHz

fIN= 900MHz

P

OUT

= -5dBm, fIN= 900MHz

fIN= 600MHz

fIN= 1900MHz
fIN= 2400MHz

fIN= 900MHz

fIN= 900MHz

fIN= 2400MHz

CONDITIONS

Harmonic Suppression

dB

dBc-25

9.2

dB

29

NFNoise Figure

6.8 11.8 16.8

14.8

S21

2

MHz500 2500f

IN

Input Frequency Range (Note 2)

35

S12

2

48

50

Reverse Isolation

7.6

7.2

-6.0

P

OUT1dB

Output 1dB Compression Point

UNITSMIN TYP MAXSYMBOLPARAMETER

AC ELECTRICAL CHARACTERISTICS—MAX2473

(

Typical Operating Circuits

, VCC= +3V, PIN= -25dBm, R

BIAS

= 15kΩ, IN driven from a 50Ω source, OUT LC matched to 50Ω, TA=

+25°C, unless otherwise noted.)

dBm

-0.9

R

BIAS

= 23kΩ

R

BIAS

= 11kΩ

fIN= 1900MHz 9.9

Transducer Gain dB

fIN= 900MHz, TA= T

MIN

to T

MAX

(Note 3) 6.4 19.0

S12

2

fIN= 900MHz

fIN= 2400MHz

fIN= 1900MHz

fIN= 600MHz

49

dB

30

34

54

Reverse Isolation
(IN to OUT1)

AC ELECTRICAL CHARACTERISTICS—MAX2472 (continued)

(

Typical Operating Circuits

, VCC= +3V, PIN= -25dBm, IN driven from a 50Ω source, OUT1 and OUT2 LC matched to 50Ω, TA=

+25°C, unless otherwise noted.)

MAX2472/MAX2473

500MHz to 2500MHz
VCO Buffer Amplifiers

4 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX2472/MAX2473 EV kit, VCC= +3V, TA = +25°C, unless otherwise noted.)

5.0

4.0

6.0

7.0

-40 -20 0 20 40 60 80

SUPPLY CURRENT vs. TEMPERATURE

MAX2472 toc01

TEMPERATURE (°C)

I

CC

(mA)

PIN = -20dBm

f

IN

= 900MHz

VCC = 3V

VCC = 5V

0

4
2

10

8
6

14
12

-50

10 30-30 -10 50 70 90

S21 2 vs. TEMPERATURE

MAX2472 toc02

TEMPERATURE (°C)

fIN = 600MHz

fIN = 900MHz

fIN = 1900MHz

fIN = 2400MHz

PIN = -20dBm

S

21

2

(dB)

0

2

4

6

10

8

12

14

-20 -16 -14-18 -12 -10 -8 -6 -4 -2 0

S21 2 vs. OUTPUT POWER

MAX2472 toc03

P

OUT

(dBm)

FOR OUT1 WITH OUT2 REACTIVELY
MATCHED AND TERMINATED

fIN = 600MHz

fIN = 900MHz

fIN = 2400MHz

S

21

2

(dB)

fIN = 1900MHz

S

21

MAX2472 toc07

A

C

B

D

(3 UNITS FULL SCALE)
FOR OUT2 WITH OUT1 BIASED
AND TERMINATED

A: f

IN

= 600MHz

B: f

IN

= 900MHz

C: f

IN

= 1900MHz

D: f

IN

= 2400MHz

S

11

MAX2472 toc06

A

C

B

D

FOR OUT2 WITH OUT1 BIASED
AND TERMINATED

A: f

IN

= 600MHz

B: f

IN

= 900MHz

C: f

IN

= 1900MHz

D: f

IN

= 2400MHz

S

12

MAX2472 toc08

A

C

B

D

(0.1 UNITS FULL SCALE)
FOR OUT2 WITH OUT1 BIASED
AND TERMINATED

A: f

IN

= 600MHz

B: f

IN

= 900MHz

C: f

IN

= 1900MHz

D: f

IN

= 2400MHz

S

22

MAX2472 toc09

A

C

B

D

FOR OUT2 WITH OUT1 BIASED
AND TERMINATED

A: f

IN

= 600MHz

B: f

IN

= 900MHz

C: f

IN

= 1900MHz

D: f

IN

= 2400MHz

MAX2472