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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 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/s 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 MAX and 8-pin SO packages,
while the MAX4288/MAX4388 come in 10-pin MAX and
14-pin SO packages.
Applications
High-Speed ADC Drivers
Communications Equipment
Instrumentation
CCD Imaging Systems
Ultrasound
Features
o High Speed at 3V
250MHz -3dB Bandwidth (MAX4285/87/88)
150MHz -3dB Bandwidth (MAX4286, MAX4387/88)
350V/s Slew Rate
o +2.85V to +6.5V Single-Supply Operation
o Input Common-Mode Range Extends to V
EE
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 MAX Packages
MAX4285MAX4288/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 -40C to +85C
6 SOT23-6
AABQ
SOT TOP
MARK
PIN-
PACKAGE
TEMP.
RANGE
PART
MAX4285ESA
-40C to +85C
8 SO
--
MAX4286EUT-T -40C to +85C
6 SOT23-6
AABR
MAX4286ESA
-40C to +85C
8 SO
--
MAX4287EUA
-40C to +85C
8 MAX
--
MAX4287ESA
-40C to +85C
8 SO
--
PART
OP AMPS
PER PKG
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
MAX/SO
MAX4288
2
1
250MHz
Yes
10-pin
MAX/14-pin SO
MAX4387
2
5
150MHz
No
8-pin
MAX/SO
MAX4388
2
5
150MHz
Yes
10-pin
MAX, 14-pin SO
Pin Configurations appear at end of data sheet.
MAX4285MAX4288/MAX4387
/
MAX4388
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3V, V
EE
= 0, DISABLE_ = 3V, R
L
=
, V
CM
= 1V, and T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25C.) (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
- V
EE
) ...................................-0.3V to +7.5V
Input Voltage Range (IN+, IN-) ........(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Differential Input Voltage .......................................-0.3V to +7.5V
Voltage at DISABLE .........................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Current into IN+, IN-, DISABLE ........................................20mA
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (T
A
= +70C)
6-Pin SOT23 (derate 7.1mW/C above +70C)............571mW
8-Pin MAX (derate 4.1mW/C above +70C) .............330mW
10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW
8-Pin SO (derate 5.88mW/C above +70C)................471mW
14-Pin SO (derate 8.3mW/C above +70C)................667mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
Guaranteed by CMRR test
MAX4_87EU_/MAX4_88EU_/MAX4_8_ES_
Guaranteed by PSRR test
mV
0.1
8
Common mode (V
EE
V
CM
V
CC
- 1.25V)
MAX4287/88 and MAX4387/88
Differential (-10mV
V
IN
+10mV)
V
EE
V
CM
V
CC
- 1.25V
CONDITIONS
V
OS
Input Offset Voltage
A
13
35
dB
50
73
CMRR
Common-Mode Rejection Ratio
V/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
A
0.2
8
I
OS
Input Offset Current
R
IN
600
mV
0.2
V
OS
Input Offset-Voltage Matching
k
38
Input Resistance
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX4285EUT-T/MAX4286EUT-T
1.5
12
MAX4_87EU_/
MAX4_88EU_/
MAX4_8_ES_
MAX4285EUT-T/
MAX4286EUT-T
45
68
R
L
= 2k
R
L
= 100
60
85
VEE + 0.4V
V
OUT
V
CC
- 0.4V
dB
75
94
A
VOL
Open-Loop Gain
65
94
R
L
= 300
MAX4285MAX4288/MAX4387
/
MAX4388
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
_______________________________________________________________________________________
3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V, V
EE
= 0, DISABLE_ = 3V, R
L
=
, V
CM
= 1V, and T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
= +25C.) (Note 1)
DISABLE_ = V
EE
A
3
22
I
IL
CONDITIONS
DISABLE_ Logic Input
Low Current
DISABLE_ = V
CC
mA
3
22
I
IH
DISABLE_ Logic Input
High Current
V
CC
= 3V
A
20
24
I
SY
Quiescent Supply Current
(per Amplifier)
Normal mode
Disabled mode,
DISABLE_ = V
EE
1
3
V
CC
= 5V
23
28
Normal mode
Disabled mode,
DISABLE_ = V
EE
1
3
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
DISABLE_ = V
EE
, V
EE
V
OUT
V
CC
R
L
= 20
to V
EE
nA
700
I
LEAK
Disabled Output Leakage
Current
mA
77
I
OUT
Output Current Drive
R
L
= 20
to V
CC
106
V
CC
= 2.85V to 6.5V
dB
40
50
PSRR
Power-Supply Rejection Ratio
V
V
CC
- 2
V
IL
DISABLE_ Logic Low Threshold
DISABLE_ Logic High Threshold
V
IH
V
CC
- 1
V
MAX4285MAX4288/MAX4387
/
MAX4388
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
4
_______________________________________________________________________________________
f
C
= 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/s
350
SR
Slew Rate
50
MHz
100
BW
0.1dB
Bandwidth for 0.1dB Flatness
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
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
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
(V
CC
= +3V, V
EE
= 0, DISABLE_ = 3V, R
L
= 300
to V
CC
/2, V
CM
= 1V, A
VCL
= +1V/V for MAX4285/MAX4287/MAX4288, A
VCL
=
+5V/V for MAX4286 and MAX4387/MAX4388, T
A
= +25C, unless otherwise noted.)
V
OUT
= 0.5Vp-p
f
C
= 100kHz
f
C
= 1MHz
50
70
Spurious-Free Dynamic Range
79
87
88
dBc
88
SFDR
f
C
= 5MHz
f
C
= 10MHz
f
C
= 20MHz
f
C
= 60MHz
ns
10% overdrive
Overload Recovery Time
MHz
200
V
OUT
= 1Vp-p
BW
LS
Large-Signal -3dB Bandwidth
f = 1MHz
nV/
Hz
10
e
n
Input Noise Voltage Density
MAX4285MAX4288/MAX4387
/
MAX4388
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
_______________________________________________________________________________________
5
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +5V, V
EE
= 0, DISABLE_ = 5V, R
L
= 300
to V
CC
/2, V
CM
= 2.5V, A
VCL
= +1V/V for MAX4285/MAX4287/MAX4288, A
VCL
=
+5V/V for MAX4286 and MAX4387/MAX4388, T
A
= +25C, unless otherwise noted.)
f = 1MHz
f
C
= 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
f
C
= 100kHz
V
OUT
= 2V step, 90% to 10%
f
C
= 1MHz
V
OUT
= 2V step, 10% to 90%
CONDITIONS
nV/
Hz
6.5
e
n
Input Noise Voltage Density
dBm
40
IP3
Two-Tone Third-Order Intercept
45
64
Spurious-Free Dynamic Range
77
86
86
dBc
86
SFDR
10
f
C
= 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
f
C
= 10MHz
MHz
220
BW
SS
Small-Signal -3dB Bandwidth
f
C
= 20MHz
V/s
385
SR
Slew Rate
40
f
C
= 60MHz
MHz
75
BW
0.1dB
Bandwidth for 0.1dB Flatness
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
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
40
t
ON
Enable Time
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 T
A
= +25C. Specifications over temperature limits are guaran-
teed by design.
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