MAXIM MAX2470, MAX2471 Technical data

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

General Description

The MAX2470/MAX2471 are flexible, low-cost, high­reverse-isolation buffer amplifiers for applications with
discrete and module-based VCO designs. Both feature
differential 50Ω outputs for driving a single differential
(balanced) load or two separate single-ended (unbal­anced) 50Ω loads. The MAX2470 offers a single-ended
input and has two selectable frequency ranges of oper­ation: 10MHz to 500MHz and 10MHz to 200MHz. The
MAX2471 offers a differential input and operates from
10MHz to 500MHz. The MAX2470/MAX2471 also feature
high input impedance for maximum flexibility, enabling
them to be used with a variety of oscillator topologies.
High reverse isolation combined with low supply current
make them ideal for applications requiring high perfor­mance with low power.

These devices are also ideal for use as active baluns.
The MAX2470 converts a single-ended input to a differ­ential output. The MAX2471 is useful as a differential
buffer stage or to convert from a differential input to two
single-ended outputs.

The MAX2470 operates from a single +2.7V to +5.5V
supply. At -5dBm output power, it consumes 5.5mA in
the high-frequency range and only 3.6mA in the
low-frequency range. The MAX2471 operates from a
+2.7V to +5.5V single supply and consumes 5.5mA.
Both devices are available in ultra-small SOT23-6 plas­tic packages, requiring minimal board space.

Applications

Cellular and PCS Mobile Phones
ISM-Band Applications
Active Baluns
General-Purpose Buffers/Amplifiers

Features

♦ +2.7V to +5.5V Supply Range
♦ Input Frequency Range

High: 10MHz to 500MHz (MAX2470/2471)
Low: 10MHz to 200MHz (MAX2470)

♦ >14dB Power Gain at 200MHz
♦ 64dB Typical Reverse Isolation at 200MHz
♦ Low-Distortion Output Drive
♦ Ultra-Small SOT23-6 Package
♦ High Input Impedance
♦ Single-Ended (MAX2470) or Differential

(MAX2471) Inputs

MAX2470/MAX2471

10MHz to 500MHz VCO Buffer Amplifiers

with Differential Outputs

________________________________________________________________

Maxim Integrated Products

1

OUT

BIAS

V

CC

GND

OUT

50Ω

50Ω

IN

HI/LO

MAX2470

OUT

BIAS

V

CC

GND

OUT

50Ω

50Ω

IN

IN

MAX2471

Typical Operating Circuits

19-4797; Rev 0; 2/99

PART

MAX2470EUT-T
MAX2471EUT-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

Pin Configuration

Ordering Information

SOT TOP

MARK

AAAX
AAAY

16V

MAX2470

2

MAX2471

34

SOT23-6

5 IN

CC

HI/LO (IN)OUT

TOP VIEW

( ) ARE FOR MAX2471

OUT

GND

f

OUT

= 200MHz,

RHI/LO = GND

No signal

MAX2470/MAX2471

10MHz to 500MHz VCO Buffer Amplifiers
with Differential Outputs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, VCC= +2.7V to +5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VCC= +3V,

T

A

= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—MAX2470

(VCC= +3V, HI/LO = VCC, all outputs are differentially measured between OUT and OUT driving a 50Ω load through a 180° hybrid,
T

A

= +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

IN to GND......-0.3V to (V

CC

+ 0.3V) or 3.7V (whichever is lower)

IN to IN ..................................................................-2.2V to +2.2V

HI/LO to GND.............................................-0.3V to (V

CC

+ 0.3V)

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

VHI/LO = GND or V

CC

CONDITIONS

mA

5.1 7.4

V2.7 5.5V

CC

Supply Voltage Range

µA-10 10I

IN

HI/LO Input Bias Current

3.0 4.5

V2.0V

IH

HI/LO Input Level High

V0.6V

IL

HI/LO Input Level Low

UNITSMIN TYP MAXSYMBOLPARAMETER

HI/LO = V

CC

HI/LO = GND

HI/LO = V

CC

CONDITIONS

14.9

MHz

10 200

f

IN

10 500

Input Frequency Range
(Note 2)

14.9

13.8

14.1

UNITSMIN TYP MAXSYMBOLPARAMETER

HI/LO = V

CC

5.5

HI/LO = GND

3.6

I

CC

Supply Current

fIN= 10MHz, HI/LO = GND

R

SOURCE

= 50Ω

V/V16A

V

Voltage Gain (Note 4)

10.2
dB

10.2

NFNoise Figure

8.9 13.3 15.3

HI/LO = GND

dB

9.9 13.4 15.0

IS21I

2

Gain (Note 3)

No signal
P

OUT

= -5dBm,

R

LOAD

= 100Ω diff.
No signal
P

OUT

= -5dBm,

R

LOAD

= 100Ω diff.

fIN= 10MHz
fIN= 200MHz

fIN= 500MHz,
TA= T

MIN

to T

MAX

fIN= 10MHz
fIN= 200MHz

fIN= 200MHz,
TA= T

MIN

to T

MAX

f

OUT

= 500MHz,

HI/LO = V

CC

f

OUT

= 200MHz,

RHI/LO = GND

MAX2470/MAX2471

10MHz to 500MHz VCO Buffer Amplifiers

with Differential Outputs

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS—MAX2471

(Typical values are measured at VCC= +3V, TA= +25°C, unless otherwise noted.) (Note 8)

AC ELECTRICAL CHARACTERISTICS—MAX2470 (continued)

(VCC= +3V, HI/LO = VCC, all outputs are differentially measured between OUT and OUT driving a 50Ω load through a 180° hybrid,
T

A

= +25°C, unless otherwise noted.)

Note 1: Limits are 100% production tested at T

A

= +25°C. Limits over the entire operating temperature range are guaranteed by

design and characterization but are not production tested.

Note 2: The part has been characterized over the specified frequency range. Operation outside of this range is possible but not

guaranteed.

Note 3: Gain specified for P

OUT

= -5dBm.

Note 4: Voltage gain measured with no input termination and no output load.
Note 5: Output VSWR is a single-ended measurement for each OUT and OUT.
Note 6: OUT to IN isolation with OUT terminated with 50Ω.
Note 7: Input terminated with 50Ω.
Note 8: Unless otherwise noted: all inputs are differentially measured between IN and IN driven by a 50Ω load through a 180°

hybrid; all outputs are differentially measured between OUT and OUT driving a 50Ω load through a 180° hybrid.

10MHz < f

OUT

< 500MHz, HI/LO = V

CC

1.5:1

CONDITIONS

10MHz < f

OUT

< 200MHz, HI/LO = GND

1.2:1

VSWR

OUT

Maximum Output VSWR
(OUT, OUT) (Note 5)

UNITSMIN TYP MAXSYMBOLPARAMETER

75
48

fIN= 500MHz, HI/LO = V

CC

37

75

fIN= 200MHz, HI/LO = GND

dB

45

Isolation OUT to OUT
(Note 7)

HI/LO = V

CC

dB

64

IS12I

2

Reverse Isolation
(Note 6)

fIN= 200MHz, P

OUT

= -5dBm, HI/LO = GND

dBc

-30

Harmonic Suppression

fIN= 500MHz, P

OUT

= -5dBm, HI/LO = V

CC

-26

fIN= 100MHz
fIN= 500MHz
fIN= 100MHz
fIN= 200MHz

HI/LO = GND

fIN= 10MHz
f

OUT

= 500MHz, R

SOURCE

= 50Ω

fIN= 10MHz

dBIS21I

2

Gain (Note 3)

V/V16A

V

Voltage Gain (Note 4)

8.4

fIN= 200MHz

CONDITIONS

fIN= 500MHz, TA= T

MIN

to T

MAX

11.3 15.6 17.8

15.9

MHz10 500f

IN

Input Frequency Range
(Note 2)

16.9

UNITSMIN TYP MAXSYMBOLPARAMETER

dBNFNoise Figure

10MHz < f

OUT

< 500MHz 1.5:1VSWR

OUT

Maximum Output VSWR
(OUT, OUT) (Note 5)

fIN= 100MHz 74
fIN= 500MHz 57

dBIS12I

2

Reverse Isolation

fIN= 500MHz 35 dB

Isolation OUT to OUT (Note 7)

fIN= 500MHz, P

OUT

= -5dBm -29 dBcHarmonic Suppression