MAX4285 Maxim, MAX4285 Datasheet

MAX4285

Manufacturer Part Number

MAX4285

Description

The MAX4285/MAX4286 single and MAX4287/MAX4288/MAX4387/MAX4388 dual ADC buffer amplifiers feature high-speed performance and single +3V supply operation

Manufacturer

Maxim

Datasheet

1.MAX4285.pdf (16 pages)

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The MAX4285/MAX4286 single and MAX4287/MAX4288/

MAX4387/MAX4388 dual ADC buffer amplifiers feature

high-speed performance and single +3V supply opera-

tion. The MAX4285/MAX4286/MAX4288 and MAX4388

offer a disable feature that reduces power-supply current

and places the outputs in a high-impedance state. All six

devices operate from a +2.85V to +6.5V single supply or

from ±1.425V to ±3.25V dual supplies. The common-

mode input voltage range extends to the negative power-

supply rail (ground in single-supply applications).

These devices require 20mA of quiescent supply current

per amplifier while achieving a 250MHz -3dB bandwidth

and a 350V/µs slew rate. The combination of an 8ns (to

0.1%) settling time, 88dBc (f = 5MHz) of SFDR, and up to

100mA output drive makes these amplifiers ideal for high-

speed ADC drivers for communications and instrumenta-

tion applications. In addition, when disabled, their high

output impedance makes them ideal for multiplexing

applications.

The MAX4285/MAX4286 are available in space-saving

6-pin SOT23 and 8-pin SO packages. The MAX4287/

MAX4387 come in 8-pin µMAX and 8-pin SO packages,

while the MAX4288/MAX4388 come in 10-pin µMAX and

14-pin SO packages.

Typical Operating Circuit appears at end of data sheet.

Pin Configurations appear at end of data sheet.

19-1500; Rev 0; 4/00

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769

+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers

MAX4285

MAX4286

MAX4287

MAX4288

MAX4387

MAX4388

PART

High-Speed ADC Drivers

Communications Equipment

Instrumentation

CCD Imaging Systems

Ultrasound

________________________________________________________________ Maxim Integrated Products

OP AMPS

PER PKG

General Description

MIN GAIN

Applications

-3dB BANDWIDTH

(AT MIN GAIN)

250MHz

150MHz

250MHz

150MHz

with High-Speed Disable

o High Speed at 3V

o +2.85V to +6.5V Single-Supply Operation

o Input Common-Mode Range Extends to V

o Low Distortion at 5MHz

o High Output Current Drive: -106mA to +77mA

o 6ns Settling Time to 0.1%

o High-Speed Enable/Disable

o Space-Saving SOT23 and µMAX Packages

Ordering Information continued at end of data sheet.

MAX4285EUT-T -40°C to +85°C

MAX4285ESA

MAX4286EUT-T -40°C to +85°C

MAX4286ESA

MAX4287EUA

MAX4287ESA

250MHz -3dB Bandwidth (MAX4285/87/88)

150MHz -3dB Bandwidth (MAX4286, MAX4387/88)

350V/µs Slew Rate

-88dBc SFDR

40ns Enable Time

50ns Disable Time

High Output Impedance

PART

HIGH-SPEED

DISABLE

-40°C to +85°C

Yes

RANGE

TEMP.

Ordering Information

10-pin µMAX/14-pin SO

10-pin µMAX, 14-pin SO

6-pin SOT23, 8-pin SO

8-pin µMAX/SO

Selector Guide

PIN-

PACKAGE

6 SOT23-6

8 SO

6 SOT23-6

8 SO

8 µMAX

8 SO

PIN-PACKAGE

Features

SOT TOP

MARK

AABQ

AABR

—

Related parts for MAX4285

MAX4285 Summary of contents

Page 1

... In addition, when disabled, their high output impedance makes them ideal for multiplexing applications. The MAX4285/MAX4286 are available in space-saving 6-pin SOT23 and 8-pin SO packages. The MAX4287/ MAX4387 come in 8-pin µMAX and 8-pin SO packages, while the MAX4288/MAX4388 come in 10-pin µMAX and 14-pin SO packages ...

Page 2

... Differential (-10mV ≤ V ≤ +10mV) IN ≤ V ≤ V Common mode ( MAX4_87EU_/ MAX4_88EU_/ MAX4_8_ES_ ≤ V ≤ 1.25V CC MAX4285EUT-T/ MAX4286EUT 2kΩ L VEE + 0.4V ≤ 300Ω L ≤ 0.4V OUT 100Ω unless otherwise noted. Typical values are at MAX MIN ...

Page 3

SOT23 ADC Buffer Amplifiers DC ELECTRICAL CHARACTERISTICS (continued +3V DISABLE_ = 3V +25°C.) (Note 1) A PARAMETER SYMBOL Output Current Drive I OUT Power-Supply Rejection Ratio PSRR Disabled ...

Page 4

... Input Capacitance C IN Output Impedance Z OUT Enable Time t ON Disable Time t OFF Crosstalk X TALK 4 _______________________________________________________________________________________ = 300Ω / 1V +1V/V for MAX4285/MAX4287/MAX4288 VCL = +25°C, unless otherwise noted.) A CONDITIONS MAX4285/87/ 100mVp-p MAX4286 and SS OUT MAX4387/ 1Vp-p LS OUT MAX4285/87/ 100mVp-p ...

Page 5

... 1MHz 1MHz 10MHz OUT V = 1V, to within 0.1% ON OUT V = 1V, to within 0.1% OUT MAX4287/88 and MAX4387/88 10MHz 2Vp-p OUT = +25°C. Specifications over temperature limits are guaran +1V/V for MAX4285/MAX4287/MAX4288, A MIN TYP MAX 220 130 195 75 40 385 4.2 2 6.5 1.9 2 ...

Page 6

... FREQUENCY (Hz) MAX4285/MAX4287/MAX4288 DISTORTION vs. FREQUENCY - 300Ω 0.5Vp-p OUT - +1V/V V -60 -70 -80 2ND HARMONIC -90 3RD HARMONIC -100 0 FREQUENCY (MHz) MAX4285/MAX4387/MAX4288 GAIN FLATNESS vs. FREQUENCY (R = 100Ω) LOAD 0 +1V/V V 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 1G 100k 1M 10M 100M FREQUENCY (Hz) MAX4286/MAX4387/MAX4388 GAIN FLATNESS vs. FREQUENCY 0.4 A ...

Page 7

... RESISTIVE LOAD (Ω) MAX4285/MAX4286/MAX4288/MAX4388 OFF-ISOLATION vs. FREQUENCY -20 -40 -60 -80 -100 -120 100k 1M 10M 1.25 100M FREQUENCY (Hz) MAX4285/MAX4287/MAX4288 DISTORTION vs. SWING - 300Ω 20MHz - +1V/V V 2ND HARMONIC -60 -70 -80 -90 -100 -110 3RD HARMONIC -120 0 0 ...

Page 8

... C (pF) LOAD COMMON-MODE REJECTION vs. FREQUENCY 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 100k 1M 10M 100M FREQUENCY (Hz) MAX4285/MAX4287/MAX4288 SMALL-SIGNAL PULSE RESPONSE (C = 22pF +1V/V) LOAD V INPUT 50mV/ div OUTPUT 50mV/ div TIME (5ns/div) GROUP DELAY vs. FREQUENCY 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 250 100k 1M 10M ...

Page 9

SOT23 ADC Buffer Amplifiers = 0, DISABLE_ ≥ 2V +3V VOLTAGE NOISE DENSITY vs. FREQUENCY 100 100 1k 10k 100k 1M FREQUENCY (Hz) INPUT OFFSET CURRENT vs. TEMPERATURE 0.5 ...

Page 10

SOT23 ADC Buffer Amplifiers with High-Speed Disable = 0, DISABLE_ ≥ 2V +3V MAX4286 SMALL-SIGNAL GAIN vs. FREQUENCY 37pF) LOAD ISO LOAD 2 +5V/V ...

Page 11

... The enable time is typically 40ns, and the disable time is typically 50ns. The MAX4285/MAX4286 have a single enable pin (DISABLE), and the MAX4288/ ______________________________________________________________________________________ with High-Speed Disable ...

Page 12

... Use a constant-impedance board design if possi- ble. High-Speed Disable The MAX4285/MAX4286/MAX4288 and MAX4388 fea- ture a disable (DISABLE_) input that places the amplifi low-power, high-output-impedance state. When DISABLE_ is asserted, the amplifier’s output impedance is typically 35kΩ. This high output impedance, com- ...

Page 13

... SO MAX4387EUA -40°C to +85°C 8 µMAX MAX4387ESA -40°C to +85° MAX4388EUB -40°C to +85°C 10 µMAX MAX4388ESD -40°C to +85° Chip Information TRANSISTOR COUNT: MAX4285/MAX4286 : 114 MA4287/MAX4288/ MAX4387/MAX4388 : 227 TOP VIEW MAX4285 MAX4286 OUT VEE IN+ IN+ ...

Page 14

SOT23 ADC Buffer Amplifiers with High-Speed Disable 14 ______________________________________________________________________________________ Package Information ...

Page 15

SOT23 ADC Buffer Amplifiers ______________________________________________________________________________________ with High-Speed Disable Package Information (continued) 15 ...

Page 16

... SOT23 ADC Buffer Amplifiers with High-Speed Disable 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. ...

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