Datasheet

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General Description

The MAX2470/MAX2471 are flexible, low-cost, high-

reverse-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 (unbal-

anced) 50Ω loads. The MAX2470 offers a single-ended

input and has two selectable frequency ranges of oper-

ation: 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 perfor-

mance with low power.

These devices are also ideal for use as active baluns.

The MAX2470 converts a single-ended input to a differ-

ential 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 plas-

tic 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

OUT

BIAS

GND

OUT

50Ω

HI/LO

MAX2470

OUT

BIAS

GND

OUT

50Ω

MAX2471

GND

HI/LO (IN)OUT

( ) ARE FOR MAX2471

16V

5 IN

OUT

MAX2470

MAX2471

SOT23-6

TOP VIEW

Typical Operating Circuits

19-4797; Rev 0; 2/99

PART

MAX2470EUT-T

MAX2471EUT-T

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

6 SOT23-6

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Pin Configuration

Ordering Information

SOT TOP

MARK

AAAX

AAAY

Summary of content (8 pages)

PAGE 1
9-4797; Rev 0; 2/99 UAL IT MAN TION K A ET U E L H A EV TA S WS DA FOLLO 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs 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.
PAGE 2
MAX2470/MAX2471 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +7V IN to GND......-0.3V to (VCC + 0.3V) or 3.7V (whichever is lower) IN to IN ..................................................................-2.2V to +2.2V HI/LO to GND .............................................-0.3V to (VCC + 0.3V) Continuous Power Dissipation SOT23-6 (derate 8.7mW/°C above +70°C)..................
PAGE 3
10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs (VCC = +3V, HI/LO = VCC, all outputs are differentially measured between OUT and OUT driving a 50Ω load through a 180° hybrid, TA = +25°C, unless otherwise noted.) PARAMETER Maximum Output VSWR (OUT, OUT) (Note 5) SYMBOL VSWROUT CONDITIONS 10MHz < fOUT < 200MHz, HI/LO = GND 1.2:1 IS12I2 HI/LO = GND Isolation OUT to OUT (Note 7) Harmonic Suppression TYP 1.
PAGE 4
Typical Operating Characteristics (VCC = +3.0V, MAX2470 output and MAX2471 input and output measurements taken differentially, TA = +25°C, unless otherwise noted.) TA = +25°C TA = +85°C 3.6 3.5 3.4 TA = -40°C 5.6 5.5 5.4 3.2 TA = +25°C TA = +85°C 5.3 5.2 5.1 TA = -40°C 5.0 4.9 3.3 4.8 3.0 3.5 4.0 4.5 5.0 2.5 3.0 3.5 4.0 4.5 5.0 5.
PAGE 5
10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs MAX2470 OUTPUT VSWR vs. FREQUENCY 1.25 OUT OUT TO IN 60 50 40 100 200 300 400 500 MAX2470/71-12 0 -2 fIN = 200MHz fIN = 500MHz -4 -6 -8 -10 OUT TO OUT INPUT TERMINATED IN 50Ω -12 20 -14 0 100 200 300 400 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 500 FREQUENCY (MHz) FREQUENCY (MHz) INPUT POWER (dBm) MAX2471 DIFFERENTIAL TRANSDUCER POWER GAIN vs. FREQUENCY MAX2471 NOISE FIGURE vs.
PAGE 6
10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs MAX2470/MAX2471 Pin Description PIN NAME FUNCTION 1 OUT Differential Noninverting Buffer Output. Broadband 50Ω output. AC coupling is required. Do not DC couple to this pin. 2 2 GND RF Ground. Connect to the ground plane as close as possible to the IC to minimize ground path inductance. 3 3 OUT Differential Inverting Buffer Output. Broadband 50Ω output. AC coupling is required. Do not DC couple to this pin.
PAGE 7
10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs TRANSISTOR COUNT: 67 6LSOT.
PAGE 8
MAX2470/MAX2471 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs NOTES 8 _______________________________________________________________________________________