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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.
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 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 µMAX Packages
MAX4285–MAX4288/MAX4387/MAX4388
Applications
High-Speed ADC Drivers
Communications Equipment
Instrumentation
CCD Imaging Systems
Ultrasound
PART
Ordering Information
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
8 SO
6 SOT23-6
8 SO
8 µMAX
8 SO
SOT TOP
MARK
AABQ
—
AABR
—
—
—
MAX4285EUT-T
-40°C to +85°C
MAX4285ESA
MAX4286ESA
MAX4287EUA
MAX4287ESA
MAX4286EUT-T
-40°C to +85°C
Typical Operating Circuit appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Ordering Information continued at end of data sheet.
Selector Guide
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
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
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
MAX4285–MAX4288/MAX4387/MAX4388
ABSOLUTE MAXIMUM RATINGS
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
= +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
(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
= +25°C.) (Note 1)
PARAMETER
Operating Supply Voltage
Range
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
V
CM
V
OS
TC
VOS
∆V
OS
I
B
I
OS
R
IN
Differential (-10mV
≤
V
IN
≤
+10mV)
Common mode (V
EE
≤
V
CM
≤
V
CC
- 1.25V)
MAX4_87EU_/
MAX4_88EU_/
MAX4_8_ES_
MAX4285EUT-T/
MAX4286EUT-T
R
L
= 2kΩ
R
L
= 300Ω
R
L
= 100Ω
75
65
60
MAX4287/88 and MAX4387/88
SYMBOL
CONDITIONS
Guaranteed by PSRR test
Guaranteed by CMRR test
MAX4_87EU_/MAX4_88EU_/MAX4_8_ES_
MAX4285EUT-T/MAX4286EUT-T
MIN
2.85
V
EE
±0.1
±1.5
26
±0.2
13
0.2
38
600
50
73
dB
45
94
94
85
dB
68
35
8
TYP
MAX
6.5
V
CC -
1.25
±8
±12
UNITS
V
V
mV
µV/°C
mV
µA
µA
kΩ
Common-Mode Rejection Ratio
CMRR
V
EE
≤
V
CM
≤
V
CC
- 1.25V
Open-Loop Gain
A
VOL
VEE + 0.4V
≤
V
OUT
≤
V
CC
- 0.4V
2
_______________________________________________________________________________________
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
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
= +25°C.) (Note 1)
PARAMETER
Output Current Drive
Power-Supply Rejection Ratio
Disabled Output Leakage
Current
DISABLE_ Logic Low Threshold
DISABLE_ Logic High Threshold
DISABLE_ Logic Input
Low Current
DISABLE_ Logic Input
High Current
SYMBOL
I
OUT
PSRR
I
LEAK
V
IL
V
IH
I
IL
I
IH
DISABLE_ = V
EE
DISABLE_ = V
CC
Normal mode
V
CC
= 3V
Quiescent Supply Current
(per Amplifier)
I
SY
V
CC
= 5V
Disabled mode,
DISABLE_ = V
EE
Normal mode
Disabled mode,
DISABLE_ = V
EE
V
CC
- 1
±3
±3
20
1
23
1
±22
±22
24
3
28
3
mA
CONDITIONS
R
L
= 20Ω to V
EE
R
L
= 20Ω to V
CC
V
CC
= 2.85V to 6.5V
DISABLE_ = V
EE
, V
EE
≤
V
OUT
≤
V
CC
40
MIN
TYP
77
106
50
700
V
CC
- 2
MAX
UNITS
mA
dB
nA
V
V
µA
µA
MAX4285–MAX4288/MAX4387/MAX4388
_______________________________________________________________________________________
3
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
MAX4285–MAX4288/MAX4387/MAX4388
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3V, V
EE
= 0, DISABLE_ = 3V, R
L
= 300Ω 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
= +25°C, unless otherwise noted.)
PARAMETER
Small-Signal -3dB Bandwidth
Large-Signal -3dB Bandwidth
Bandwidth for 0.1dB Flatness
Slew Rate
Rise Time
Fall Time
Settling Time (0.1%)
Overload Recovery Time
SYMBOL
BW
SS
BW
LS
BW
0.1dB
SR
t
R
t
F
t
S 0.1%
CONDITIONS
MAX4285/87/88
V
OUT
= 100mVp-p
V
OUT
= 1Vp-p
MAX4285/87/88
V
OUT
= 100mVp-p
MAX4286 and
MAX4387/88
MAX4286 and
MAX4387/88
MIN
TYP
250
150
200
100
50
350
2.2
2.8
6
14
25
f
C
= 100kHz
f
C
= 1MHz
Spurious-Free Dynamic Range
SFDR
V
OUT
= 0.5Vp-p
f
C
= 5MHz
f
C
= 10MHz
f
C
= 20MHz
f
C
= 60MHz
Two-Tone Third-Order Intercept
Input Noise Voltage Density
Input Noise Current Density
Input Capacitance
Output Impedance
Enable Time
Disable Time
Crosstalk
IP
3
e
n
i
n
C
IN
Z
OUT
t
ON
t
OFF
X
TALK
f = 10MHz
V
OUT
= 1V, to within 0.1%
V
OUT
= 1V, to within 0.1%
MAX4287/88 and MAX4387/88,
f = 10MHz, V
OUT
= 1Vp-p
f
C
= 20MHz
f = 1MHz
f = 1MHz
88
88
87
79
70
50
34
10
2.1
2
0.5
40
50
85
dBm
nV/√Hz
pA/√Hz
pF
Ω
ns
dBc
dBc
ns
ns
MHz
V/µs
ns
ns
MHz
MHz
MAX
UNITS
V
OUT
= 1V step, 10% to 90%
V
OUT
= 1V step, 10% to 90%
V
OUT
= 1V step, 90% to 10%
MAX4285/87/88
V
OUT
= 1V step
10% overdrive
MAX4286 and
MAX4387/88
4
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