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PDF MAX4287EUA Data sheet ( Hoja de datos )
| Número de pieza | MAX4287EUA | |
| Descripción | +3V/+5V / 250MHz / SOT23 ADC Buffer Amplifiers with High-Speed Disable | |
| Fabricantes | Maxim Integrated | |
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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
1 page  
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = 0, DISABLE_ = 5V, RL = 300Ω to 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 Ω
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
5 Page 
+3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers
with High-Speed Disable
MAX4285
MAX4286
6-PIN
SOT23-6
8-PIN
SO
— 1, 5
16
24
33
42
58
——
——
67
——
——
——
——
——
——
PIN
MAX4287
MAX4387
8-PIN
µMAX/SO
—
—
4
—
—
—
—
—
8
1
2
3
5
6
7
Pin Description
MAX4288
MAX4388
10-PIN
µMAX
14-PIN
SO
— 5, 7, 8, 10
——
44
——
——
——
56
69
10 14
11
22
33
7 11
8 12
9 13
NAME
N.C.
OUT
VEE
IN+
IN-
DISABLE
DISABLEA
DISABLEB
VCC
OUTA
INA-
INA+
INB+
INB-
OUTB
FUNCTION
Not Internally Connected. Connect to
ground or leave unconnected.
Amplifier Output
Negative Power Supply, or Ground in
Single-Supply Operation
Noninverting Input
Inverting Input
Disable (active low)
Disable Amplifier A (active low)
Disable Amplifier B (active low)
Positive Power Supply
Amplifier A Output
Amplifier A Inverting Input
Amplifier A Noninverting Input
Amplifier B Noninverting Input
Amplifier B Inverting Input
Amplifier B Output
Detailed Description
The MAX4285–MAX4288 and MAX4387/MAX4388 are
voltage-feedback op amps, intended for use as ADC
input buffers. They operate from a single +2.85V to
+6.5V supply or dual ±1.425V to ±3.25V supplies. Their
high output drive, wide bandwidth, fast settling, low
noise, and low distortion make them ideal for the brutal
task of meeting the dynamic input drive requirements of
high-speed ADCs or other demanding applications.
The MAX4285/MAX4286/MAX4288 and MAX4388 have
a high-speed disable mode that places the outputs in a
high-impedance state and lowers operating supply cur-
rent to 1mA. 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/
MAX4388 have dual disable pins (DISABLEA, DISA-
BLEB).
The MAX4285/MAX4287/MAX4288 are internally com-
pensated for unity-gain stability. The MAX4286/
MAX4387/MAX4388 are compensated for gains of
+5V/V or greater.
Applications Information
Inverting and Noninverting Configurations
Select the gain-setting feedback (RF) and input (RG)
resistor values considering the following criteria: large
resistor values increase voltage noise and interact with
the amplifier’s input and PC board capacitance to
effect system bandwidth. This generates undesirable
poles and zeros that decrease bandwidth or cause
oscillations.
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX4287EUA.PDF ] | |
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