MAXIM MAX4285, MAX4288, MAX4387, MAX4388 Technical data

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General Description

The MAX4285/MAX4286 single and MAX4287/MAX4288/
MAX4387/MAX4388 dual ADC buffer amplifiers feature
high-speed performance and single +3V supply opera­tion. 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 common­mode input voltage range extends to the negative power­supply 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 high­speed ADC drivers for communications and instrumenta­tion 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.

Applications

High-Speed ADC Drivers

Communications Equipment

Instrumentation

CCD Imaging Systems

Ultrasound

Features

♦ High Speed at 3V

250MHz -3dB Bandwidth (MAX4285/87/88)
150MHz -3dB Bandwidth (MAX4286, MAX4387/88)
350V/µs Slew Rate

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

♦ Input Common-Mode Range Extends to V

EE

♦ Low Distortion at 5MHz

-88dBc SFDR

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

♦ 6ns Settling Time to 0.1%

♦ High-Speed Enable/Disable

40ns Enable Time
50ns Disable Time
High Output Impedance

♦ Space-Saving SOT23 and µMAX Packages

MAX4285–MAX4288/MAX4387/MAX4388

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

with High-Speed Disable

________________________________________________________________ Maxim Integrated Products 1

19-1500; Rev 0; 4/00

Ordering Information continued at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

Ordering Information

Selector Guide

MAX4285EUT-T

-40°C to +85°C 6 SOT23-6

AABQ

SOT TOP

MARK

PIN­PACKAGE

TEMP.

RANGE

PART

MAX4285ESA -40°C to +85°C 8 SO —

MAX4286EUT-T

-40°C to +85°C 6 SOT23-6

AABR

MAX4286ESA -40°C to +85°C 8 SO —

MAX4287EUA

-40°C to +85°C 8 µMAX —

MAX4287ESA -40°C to +85°C 8 SO —

PART

OP AMPS

MIN GAIN

-3dB BANDWIDTH
(AT MIN GAIN)

HIGH-SPEED

DISABLE

PIN-PACKAGE

MAX4285 1 1 250MHz Yes 6-pin SOT23, 8-pin SO

MAX4286 1 5 150MHz Yes 6-pin SOT23, 8-pin SO
MAX4287 2 1 250MHz No 8-pin µMAX/SO
MAX4288 2 1 250MHz Yes 10-pin µMAX/14-pin SO
MAX4387 2 5 150MHz No 8-pin µMAX/SO
MAX4388 2 5 150MHz Yes 10-pin µMAX, 14-pin SO

Pin Configurations appear at end of data sheet.

PER PKG

MAX4285–MAX4288/MAX4387/MAX4388

+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3V, VEE= 0, DISABLE_ = 3V, RL= ∞, VCM= 1V, and TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 1)

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.

Supply Voltage (V

CC

- VEE) ...................................-0.3V to +7.5V

Input Voltage Range (IN+, IN-) ........(VEE- 0.3V) to (VCC+ 0.3V)

Differential Input Voltage .......................................-0.3V to +7.5V

Voltage at

DISABLE .........................(VEE- 0.3V) to (VCC+ 0.3V)

Current into IN+, IN-, DISABLE ........................................±20mA

Output Short-Circuit Duration ........................................Indefinite

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW

8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW

10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW

8-Pin SO (derate 5.88mW/°C above +70°C)................471mW

14-Pin SO (derate 8.3mW/°C above +70°C)................667mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Guaranteed by CMRR test

MAX4_87EU_/MAX4_88EU_/MAX4_8_ES_

Guaranteed by PSRR test

mV

±0.1 ±8

Common mode (VEE≤ VCM≤ VCC- 1.25V)

MAX4287/88 and MAX4387/88

Differential (-10mV ≤ VIN≤ +10mV)

VEE≤ VCM≤
V

CC

- 1.25V

CONDITIONS

V

OS

Input Offset Voltage

µA

13 35

dB

50 73

CMRRCommon-Mode Rejection Ratio

µV/°C

26

TC

VOS

Input Offset-Voltage
Temperature Coefficient

V

V

EE

V

CC -

1.25

V

CM

V

2.85 6.5

Operating Supply Voltage
Range

Input Common-Mode Voltage
Range

I

B

Input Bias Current

µA

0.2 8

I

OS

Input Offset Current

R

IN

600

mV

±0.2

∆V

OS

Input Offset-Voltage Matching

kΩ

38

Input Resistance

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX4285EUT-T/MAX4286EUT-T

±1.5 ±12

MAX4_87EU_/

MAX4_88EU_/

MAX4_8_ES_

MAX4285EUT-T/

MAX4286EUT-T

45 68

RL= 2kΩ

RL= 100Ω

60 85

VEE + 0.4V ≤
V

OUT

≤ VCC- 0.4V

dB

75 94

A

VOL

Open-Loop Gain

65 94

RL= 300Ω

MAX4285–MAX4288/MAX4387/MAX4388

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

with High-Speed Disable

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3V, VEE= 0, DISABLE_ = 3V, RL= ∞, VCM= 1V, and TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 1)

DISABLE_ = V

EE

µA

±3 ±22

I

IL

CONDITIONS

DISABLE_ Logic Input
Low Current

DISABLE_ = V

CC

mA

±3 ±22

I

IH

DISABLE_ Logic Input
High Current

VCC= 3V

µA

20 24

I

SY

Quiescent Supply Current
(per Amplifier)

Normal mode

Disabled mode,

DISABLE_ = V

EE

13

VCC= 5V

23 28

Normal mode

Disabled mode,

DISABLE_ = V

EE

13

UNITSMIN TYP MAXSYMBOLPARAMETER

DISABLE_ = VEE, VEE≤ V

OUT

≤ V

CC

RL= 20Ω to V

EE

nA

700

I

LEAK

Disabled Output Leakage
Current

mA

77

I

OUT

Output Current Drive

RL= 20Ω to V

CC

106

VCC= 2.85V to 6.5V dB

40 50

PSRRPower-Supply Rejection Ratio

V

V

CC

- 2

V

IL

DISABLE_ Logic Low Threshold

DISABLE_ Logic High Threshold V

IH

V

CC

- 1

V

MAX4285–MAX4288/MAX4387/MAX4388

+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable

4 _______________________________________________________________________________________

fC= 20MHz

MAX4286 and

MAX4387/88

MAX4285/87/88

MAX4285/87/88

MAX4286 and

MAX4387/88

V

OUT

= 100mVp-p

V

OUT

= 1V step, 10% to 90%

V

OUT

= 1V step

V

OUT

= 100mVp-p

MAX4285/87/88

MAX4286 and
MAX4387/88

V

OUT

= 1V step, 90% to 10%

V

OUT

= 1V step, 10% to 90%

CONDITIONS

dBm

34

IP

3

Two-Tone Third-Order Intercept

25

14

ns

6

t

S 0.1%

Settling Time (0.1%)

ns

2.8

t

F

Fall Time

ns

2.2

t

R

Rise Time

150

MHz

250

BW

SS

Small-Signal -3dB Bandwidth

V/µs

350

SRSlew Rate

50

MHz

100

BW

0.1dB

Bandwidth for 0.1dB Flatness

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 1MHz

MAX4287/88 and MAX4387/88,
f = 10MHz, V

OUT

= 1Vp-p

V

OUT

= 1V, to within 0.1%

V

OUT

= 1V, to within 0.1%

f = 10MHz

dBc

85

X

TALK

Crosstalk

50

t

OFF

Disable Time

ns

40

t

ON

Enable Time

Ω

0.5

Z

OUT

Output Impedance

pF

2

C

IN

Input Capacitance

pA/√Hz

2.1

i

n

Input Noise Current Density

AC ELECTRICAL CHARACTERISTICS

(VCC= +3V, VEE= 0, DISABLE_ = 3V, RL= 300Ω to VCC/2, VCM= 1V, A

VCL

= +1V/V for MAX4285/MAX4287/MAX4288, A

VCL

=

+5V/V for MAX4286 and MAX4387/MAX4388, T

A

= +25°C, unless otherwise noted.)

V

OUT

= 0.5Vp-p

fC= 100kHz

fC= 1MHz

50

70

Spurious-Free Dynamic Range

79

87

88

dBc

88

SFDR

fC= 5MHz

fC= 10MHz

fC= 20MHz

fC= 60MHz

ns10% overdriveOverload Recovery Time

MHz

200

V

OUT

= 1Vp-pBW

LS

Large-Signal -3dB Bandwidth

f = 1MHz

nV/√Hz

10

e

n

Input Noise Voltage Density

MAX4285–MAX4288/MAX4387/MAX4388

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

with High-Speed Disable

_______________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS (continued)

(VCC = +5V, VEE= 0, DISABLE_ = 5V, RL= 300Ω to VCC/2, VCM= 2.5V, A

VCL

= +1V/V for MAX4285/MAX4287/MAX4288, A

VCL

=

+5V/V for MAX4286 and MAX4387/MAX4388, T

A

= +25°C, unless otherwise noted.)

f = 1MHz

fC= 20MHz

MAX4286 and

MAX4387/88

MAX4285/87/88

MAX4285/87/88

MAX4286 and

MAX4387/88

V

OUT

=

100mVp-p

V

OUT

= 1Vp-p

V

OUT

= 2V step, 10% to 90%

V

OUT

= 2V step

V

OUT

= 100mVp-p

MAX4285/87/88

V

OUT

= 1Vp-p

MAX4286 and
MAX4387/88

fC= 100kHz

V

OUT

= 2V step, 90% to 10%

fC= 1MHz

V

OUT

= 2V step, 10% to 90%

CONDITIONS

nV/√Hz

6.5

e

n

Input Noise Voltage Density

dBm

40

IP3Two-Tone Third-Order Intercept

45

64

Spurious-Free Dynamic Range

77

86

86

dBc

86

SFDR

10

fC= 5MHz

ns

8

t

S 0.1%

Settling Time (0.1%)

ns

2.9

t

F

Fall Time

ns

4.2

t

R

Rise Time

MHz

195

BW

LS

Large-Signal -3dB Bandwidth

130

fC= 10MHz

MHz

220

BW

SS

Small-Signal -3dB Bandwidth

fC= 20MHz

V/µs

385

SRSlew Rate

40

fC= 60MHz

MHz

75

BW

0.1dB

Bandwidth for 0.1dB Flatness

UNITSMIN TYP MAXSYMBOLPARAMETER

f = 1MHz

MAX4287/88 and MAX4387/88,
f = 10MHz, V

OUT

= 2Vp-p

V

OUT

= 1V, to within 0.1%

V

OUT

= 1V, to within 0.1%

f = 10MHz

dBc

85

X

TALK

Crosstalk

35

t

OFF

Disable Time

ns

40t

ON

Enable Time

Ω

0.5

Z

OUT

Output Impedance

pF

2

C

IN

Input Capacitance

pA/√Hz

1.9

i

n

Input Noise Current Density

Note 1: The MAX428_EUT (SOT23) are 100% production tested at TA= +25°C. Specifications over temperature limits are guaran-

teed by design.