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19-1500; Rev 0; 4/00
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
General Description
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.
Applications
High-Speed ADC Drivers
Communications Equipment
Instrumentation
CCD Imaging Systems
Ultrasound
Typical Operating Circuit appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Features
o High Speed at 3V
250MHz -3dB Bandwidth (MAX4285/87/88)
150MHz -3dB Bandwidth (MAX4286, MAX4387/88)
350V/µs Slew Rate
o +2.85V to +6.5V Single-Supply Operation
o Input Common-Mode Range Extends to VEE
o Low Distortion at 5MHz
-88dBc SFDR
o High Output Current Drive: -106mA to +77mA
o 6ns Settling Time to 0.1%
o High-Speed Enable/Disable
40ns Enable Time
50ns Disable Time
High Output Impedance
o Space-Saving SOT23 and µMAX Packages
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
MAX4285EUT-T -40°C to +85°C 6 SOT23-6
MAX4285ESA -40°C to +85°C 8 SO
MAX4286EUT-T -40°C to +85°C 6 SOT23-6
MAX4286ESA -40°C to +85°C 8 SO
MAX4287EUA -40°C to +85°C 8 µMAX
MAX4287ESA -40°C to +85°C 8 SO
SOT TOP
MARK
AABQ
AABR
Ordering Information continued at end of data sheet.
PART
MAX4285
MAX4286
MAX4287
MAX4288
MAX4387
MAX4388
OP AMPS
PER PKG
1
1
2
2
2
2
MIN GAIN
1
5
1
1
5
5
-3dB BANDWIDTH
(AT MIN GAIN)
250MHz
150MHz
250MHz
250MHz
150MHz
150MHz
HIGH-SPEED
DISABLE
Yes
Yes
No
Yes
No
Yes
Selector Guide
PIN-PACKAGE
6-pin SOT23, 8-pin SO
6-pin SOT23, 8-pin SO
8-pin µMAX/SO
10-pin µMAX/14-pin SO
8-pin µMAX/SO
10-pin µMAX, 14-pin SO
________________________________________________________________ Maxim Integrated Products 1
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

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+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC - 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 (TA = +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
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +3V, VEE = 0, DISABLE_ = 3V, RL = , VCM = 1V, and TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
Operating Supply Voltage
Range
SYMBOL
CONDITIONS
Guaranteed by PSRR test
MIN TYP MAX UNITS
2.85 6.5 V
Input Common-Mode Voltage
Range
Input Offset Voltage
Input Offset-Voltage
Temperature Coefficient
Input Offset-Voltage Matching
Input Bias Current
Input Offset Current
Input Resistance
Common-Mode Rejection Ratio
VCM Guaranteed by CMRR test
MAX4_87EU_/MAX4_88EU_/MAX4_8_ES_
VOS MAX4285EUT-T/MAX4286EUT-T
TCVOS
VOS
IB
IOS
RIN
CMRR
MAX4287/88 and MAX4387/88
Differential (-10mV VIN +10mV)
Common mode (VEE VCM VCC - 1.25V)
VEE VCM
VCC - 1.25V
MAX4_87EU_/
MAX4_88EU_/
MAX4_8_ES_
MAX4285EUT-T/
MAX4286EUT-T
VEE
VCC -
1.25
V
±0.1
±1.5
±8
±12
mV
26 µV/°C
±0.2
13
0.2
38
600
35
8
mV
µA
µA
k
50 73
dB
45 68
Open-Loop Gain
AVOL
VEE + 0.4V
VOUT VCC - 0.4V
RL = 2k
RL = 300
RL = 100
75 94
65 94
60 85
dB
2 _______________________________________________________________________________________

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+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3V, VEE = 0, DISABLE_ = 3V, RL = , VCM = 1V, and TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 1)
PARAMETER
Output Current Drive
Power-Supply Rejection Ratio
SYMBOL
IOUT
PSRR
CONDITIONS
RL = 20to VEE
RL = 20to VCC
VCC = 2.85V to 6.5V
Disabled Output Leakage
Current
ILEAK DISABLE_ = VEE, VEE VOUT VCC
DISABLE_ Logic Low Threshold
DISABLE_ Logic High Threshold
VIL
VIH
DISABLE_ Logic Input
Low Current
IIL DISABLE_ = VEE
MIN TYP MAX UNITS
77
mA
106
40 50
dB
700 nA
VCC - 1
VCC - 2
V
V
±3 ±22 µA
DISABLE_ Logic Input
High Current
Quiescent Supply Current
(per Amplifier)
IIH DISABLE_ = VCC
VCC = 3V
ISY
VCC = 5V
Normal mode
Disabled mode,
DISABLE_ = VEE
Normal mode
Disabled mode,
DISABLE_ = VEE
±3 ±22 µA
20 24
13
mA
23 28
13
_______________________________________________________________________________________ 3

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+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
AC ELECTRICAL CHARACTERISTICS
(VCC = +3V, VEE = 0, DISABLE_ = 3V, RL = 300to VCC/2, VCM = 1V, AVCL = +1V/V for MAX4285/MAX4287/MAX4288, AVCL =
+5V/V for MAX4286 and MAX4387/MAX4388, TA = +25°C, unless otherwise noted.)
PARAMETER
Small-Signal -3dB Bandwidth
SYMBOL
BWSS
CONDITIONS
MAX4285/87/88
VOUT = 100mVp-p
MAX4286 and
MAX4387/88
MIN TYP MAX UNITS
250
MHz
150
Large-Signal -3dB Bandwidth
BWLS VOUT = 1Vp-p
Bandwidth for 0.1dB Flatness BW0.1dB VOUT = 100mVp-p
MAX4285/87/88
MAX4286 and
MAX4387/88
200 MHz
100
MHz
50
Slew Rate
Rise Time
Fall Time
Settling Time (0.1%)
Overload Recovery Time
Spurious-Free Dynamic Range
Two-Tone Third-Order Intercept
Input Noise Voltage Density
Input Noise Current Density
Input Capacitance
Output Impedance
Enable Time
Disable Time
Crosstalk
SR
tR
tF
tS 0.1%
SFDR
IP3
en
in
CIN
ZOUT
tON
tOFF
XTALK
VOUT = 1V step, 10% to 90%
VOUT = 1V step, 10% to 90%
VOUT= 1V step, 90% to 10%
MAX4285/87/88
VOUT = 1V step
MAX4286 and
MAX4387/88
10% overdrive
VOUT = 0.5Vp-p
fC = 20MHz
f = 1MHz
fC = 100kHz
fC = 1MHz
fC = 5MHz
fC = 10MHz
fC = 20MHz
fC = 60MHz
f = 1MHz
f = 10MHz
VOUT = 1V, to within 0.1%
VOUT = 1V, to within 0.1%
MAX4287/88 and MAX4387/88,
f = 10MHz, VOUT = 1Vp-p
350 V/µs
2.2 ns
2.8 ns
6
ns
14
25 ns
88
88
87
dBc
79
70
50
34 dBm
10 nV/Hz
2.1 pA/Hz
2 pF
0.5
40
ns
50
85 dBc
4 _______________________________________________________________________________________

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+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, DISABLE_ = 5V, RL = 300to VCC/2, VCM = 2.5V, AVCL = +1V/V for MAX4285/MAX4287/MAX4288, AVCL =
+5V/V for MAX4286 and MAX4387/MAX4388, TA = +25°C, unless otherwise noted.)
PARAMETER
Small-Signal -3dB Bandwidth
SYMBOL
BWSS
VOUT =
100mVp-p
CONDITIONS
MAX4285/87/88
MAX4286 and
MAX4387/88
MIN TYP MAX UNITS
220
MHz
130
Large-Signal -3dB Bandwidth
BWLS VOUT = 1Vp-p
Bandwidth for 0.1dB Flatness BW0.1dB VOUT = 100mVp-p
MAX4285/87/88
MAX4286 and
MAX4387/88
195 MHz
75
MHz
40
Slew Rate
Rise Time
Fall Time
Settling Time (0.1%)
SR
tR
tF
tS 0.1%
VOUT = 2V step, 10% to 90%
VOUT = 2V step, 10% to 90%
VOUT= 2V step, 90% to 10%
MAX4285/87/88
VOUT = 2V step
MAX4286 and
MAX4387/88
385 V/µs
4.2 ns
2.9 ns
8
ns
10
Spurious-Free Dynamic Range
Two-Tone Third-Order Intercept
Input Noise Voltage Density
Input Noise Current Density
Input Capacitance
Output Impedance
Enable Time
Disable Time
Crosstalk
SFDR
IP3
en
in
CIN
ZOUT
tON
tOFF
XTALK
VOUT = 1Vp-p
fC = 20MHz
f = 1MHz
f = 1MHz
fC = 100kHz
fC = 1MHz
fC = 5MHz
fC = 10MHz
fC = 20MHz
fC = 60MHz
f = 10MHz
VOUT = 1V, to within 0.1%
VOUT = 1V, to within 0.1%
MAX4287/88 and MAX4387/88,
f = 10MHz, VOUT = 2Vp-p
86
86
86
dBc
77
64
45
40 dBm
6.5 nV/Hz
1.9 pA/Hz
2 pF
0.5
40
ns
35
85 dBc
Note 1: The MAX428_EUT (SOT23) are 100% production tested at TA = +25°C. Specifications over temperature limits are guaran-
teed by design.
_______________________________________________________________________________________ 5