Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp, buffer amplifer Buffer SOT 23 6

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General Description

The MAX2472/MAX2473 are flexible, wideband, high-

reverse-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-col-

lector 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 V

= +3.0V and -25dBm

input power, the MAX2472 consumes 5.2mA, while the

MAX2473 consumes only 2.7mA. Both devices are avail-

able 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

Functional Diagrams

19-1466; Rev 0; 6/99

PART

MAX2472EUT-T

MAX2473EUT-T

-40°C to +85°C

TEMP.

RANGE

PIN-

PACKAGE

6 SOT23-6

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

SOT

TOP MARK

AAAZ

AABA

GND

OUT2

OUT1

MAX2472

BIAS

GND GND

BIAS

OUT

MAX2473

BIAS

GND

IN OUT2 (BIAS)

16V

5 GND

OUT1 (OUT)

MAX2472

MAX2473

SOT23-6

TOP VIEW

( ) ARE FOR MAX2473.

Pin Configuration

Summary of content (12 pages)

PAGE 1
9-1466; Rev 0; 6/99 ANUAL N KIT M EET IO T A U EVAL TA SH WS DA FOLLO 500MHz to 2500MHz VCO Buffer Amplifiers 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.
PAGE 2
MAX2472/MAX2473 500MHz to 2500MHz VCO Buffer Amplifiers ABSOLUTE MAXIMUM RATINGS VCC to 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)...................
PAGE 3
500MHz to 2500MHz VCO Buffer Amplifiers (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.) PARAMETER Reverse Isolation (IN to OUT1) SYMBOL S122 Noise Figure NF CONDITIONS MIN TYP fIN = 600MHz 54 fIN = 900MHz 49 fIN = 1900MHz 34 fIN = 2400MHz 30 fIN = 900MHz 9.5 fIN = 1900MHz 10.
PAGE 4
Typical Operating Characteristics (MAX2472/MAX2473 EV kit, VCC = +3V, TA = +25°C, unless otherwise noted.) MAX2472 MAX2472 toc01 PIN = -20dBm fIN = 900MHz 12 10 S21 2 (dB) 6.0 VCC = 5V ICC (mA) PIN = -20dBm fIN = 600MHz 14 MAX2472 toc02 S21 2 vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE 7.0 VCC = 3V 8 fIN = 900MHz fIN = 1900MHz 6 5.0 4 fIN = 2400MHz 2 -20 0 20 40 60 0 -50 80 -30 -10 10 30 50 TEMPERATURE (°C) TEMPERATURE (°C) S21 2 vs.
PAGE 5
00MHz to 2500MHz VCO Buffer Amplifiers MAX2472 SCATTERING PARAMETERS (IN to OUT 2) _______________________________________________________________________________________ 5 MAX2472/MAX2473 Typical Operating Characteristics (continued) (MAX2472/MAX2473 EV kit, VCC = +3V, TA = +25°C, unless otherwise noted.
PAGE 6
Typical Operating Characteristics (continued) (MAX2472/MAX2473 EV kit, VCC = +3V, TA = +25°C, unless otherwise noted.) MAX2473 14 7 VCC = 5V 5 14 fIN = 900MHz 10 8 fIN = 1900MHz VCC = 3V 2 fIN = 2400MHz 35 30 25 20 15 0 -50 10 -25 S21 2 vs.
PAGE 7
500MHz to 2500MHz VCO Buffer Amplifiers MAX2473 S11 MAX2472 toc15 -30 fIN = 900MHz -35 REVERSE ISOLATION (dB) MAX2472 toc16 REVERSE ISOLATION vs. RBIAS -40 -45 D -50 A B C -55 -60 0 5 10 15 20 25 30 35 RBIAS = 15kΩ 40 RBIAS (kΩ) S21 A: fIN = 600MHz B: fIN = 900MHz C: fIN = 1900MHz D: fIN = 2400MHz S22 MAX2472 toc19 MAX2472 toc17 MAX2472 toc18 S12 D A C B A D B C (3 UNITS FULL SCALE) RBIAS = 15kΩ D B A A: fIN = 600MHz B: fIN = 900MHz C: fIN = 1900MHz D: fIN = 2400MHz C (0.
PAGE 8
MAX2472/MAX2473 500MHz to 2500MHz VCO Buffer Amplifiers Typical Operating Characteristics (continued) (MAX2472/MAX2473 EV kit, VCC = +3V, TA = +25°C, unless otherwise noted.
PAGE 9
500MHz to 2500MHz VCO Buffer Amplifiers PIN NAME FUNCTION MAX2472 MAX2473 1 — OUT1 Open-Collector Buffer Output 1. Connect to VCC via a resistor or inductor/choke. AC-coupling to the output is required. — 1 OUT Open-Collector Buffer Output. Connect to VCC via a resistor or inductor/choke. AC-coupling to the output is required. 2, 5 2, 5 GND RF Ground. Connect to the ground plane as close to the IC as possible to minimize trace inductance. 3 — OUT2 Open-Collector Buffer Output 2.
PAGE 10
MAX2472/MAX2473 500MHz to 2500MHz VCO Buffer Amplifiers VCC (PIN 6) VCC (PIN 6) INTERNAL 1.2V REFERENCE 250Ω 1.3pF 1k 1k BIAS (PIN 3) IN (PIN 4) GND (PIN 2) 33Ω Figure 3. BIAS Structure (MAX2473 only) GND (PIN 5) Figure 1. Input Structure VCC (PIN 6) 2k OUT the MAX2472/MAX2473 from the S parameter tables in the Typical Operating Characteristics.
PAGE 11
500MHz to 2500MHz VCO Buffer Amplifiers uses a topside RF ground, connect both GND pins 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 the board with plated throughholes (vias) to the ground plane, located as close to the package as possible. Typical Operating Circuits VCC VCC 0.01µF 30pF 1.0µF 0.01µF VCC LMATCH BIAS TO MIXER CMATCH OUT2 MAX2472 VCO IN OUT1 100pF CMATCH TO MIXER OR PLL GND GND LMATCH 0.
PAGE 12
500MHz to 2500MHz VCO Buffer Amplifiers 6LSOT.