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PDF MAX4291EXK-T Data sheet ( Hoja de datos )
| Número de pieza | MAX4291EXK-T | |
| Descripción | Ultra-Small / !.8V / Power / Rail-to-Rail I/O Op Amps | |
| Fabricantes | Maxim Integrated | |
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19-1612; Rev 0; 3/00
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
General Description
The MAX4291/MAX4292/MAX4294 family of micropow-
er operational amplifiers operates from a +1.8V to
+5.5V single supply or ±0.9V to ±2.75V dual supplies
and has Rail-to-Rail® input/output capabilities. These
amplifiers provide a 500kHz gain-bandwidth product
and 120dB open-loop voltage gain while using only
100µA of supply current per amplifier. The combination
of low input offset voltage (±400µV) and high-open-loop
gain makes them suitable for low-power/low-voltage
high-precision applications.
The MAX4291/MAX4292/MAX4294 have an input com-
mon-mode range that extends to each supply rail, and
their outputs typically swing within 20mV of the rails with
a 2kΩ load. Although the minimum operating voltage is
specified at +1.8V, these devices typically operate down
to +1.5V. The combination of ultra-low-voltage operation,
rail-to-rail inputs/output, and low-power consumption
makes these devices ideal for any portable/two-cell bat-
tery-powered system.
The single MAX4291 is offered in an ultra-small 5-pin
SC70 package and the dual MAX4292 is offered in a
space-saving 8-pin µMAX package.
Applications
2-Cell Battery-Operated Systems
Portable Electronic Equipment
Battery-Powered Instrumentation
Digital Scales
Strain Gauges
Sensor Amplifiers
Cellular Phones
PART
MAX4291
MAX4292
MAX4294
Selector Guide
AMPLIFIERS
PER PACKAGE
1
2
4
PIN-PACKAGE
5-pin SC70/SOT23
8-pin µMAX/SO
14-pin SO/TSSOP
Features
o Ultra-Low Voltage Operation—Guaranteed Down
to +1.8V
o 100µA Supply Current per Amplifier
o 500kHz Gain-Bandwidth Product
o 120dB Open-Loop Voltage Gain (RL = 100kΩ)
o 0.017% THD + Noise at 1kHz
o Rail-to-Rail Input Common-Mode Range
o Rail-to-Rail Output Drives 2kΩ Load
o No Phase Reversal for Overdriven Inputs
o Unity-Gain Stable for Capacitive Loads up to 100pF
o 400µV Input Offset Voltage
o Single Available in Ultra-Small 5-Pin SC70
Dual Available in Space-Saving 8-Pin µMAX
Ordering Information
PART
TEMP. RANGE
PIN-
PACKAGE
MAX4291EXK-T
MAX4291EUK-T
MAX4292EUA*
MAX4292ESA*
MAX4294ESD*
MAX4294EUD*
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
5 SC70-5
5 SOT23-5
8 µMAX
8 SO
14 SO
14 TSSOP
*Future product—contact factory for availability.
TOP
MARK
AAD
ADML
—
—
—
—
Pin Configurations
TOP VIEW
IN+ 1
VEE 2
IN- 3
MAX4291
5 VCC OUTA 1
INA- 2
INA+ 3
4 OUT VEE 4
MAX4292
8 VCC
7 OUTB
6 INB-
5 INB+
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
SC70-5/SOT23-5
µMAX/SO
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
Typical Operating Characteristics
(VCC = +2.4V, VEE = VCM = 0, VOUT = VCC / 2, no load, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT PER AMPLIFIER
vs. TEMPERATURE
160
150
140
130
120 VCC = 5.5V
110
100
90
VCC = 1.8V
80
70
60
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. TEMPERATURE
35
30
25
20
VCC = 5.5V
15
10 VCC = 1.8V
5
0
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING vs.
TEMPERATURE (RL = 100kΩ to VCC / 2)
3.5
VOH = VCC - VOUT
3.0 VOL = VOUT - VEE
2.5 VOL (VCC = 5.5V)
2.0
1.5
1.0 VOL (VCC = 1.8V)
0.5
VOH (VCC = 5.5V)
VOH (VCC = 1.8V)
0.0
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE (PSRR ≥80dB)
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
INPUT BIAS CURRENT vs. COMMON-MODE
VOLTAGE (VCC = 1.8V)
40
30
20
10
0
-10
-20
-30
-40
-0.5
0 0.5 1.0 1.5 2.0
COMMON-MODE VOLTAGE (V)
2.5
OUTPUT VOLTAGE SWING vs.
TEMPERATURE (RL = 2kΩ to VCC / 2)
35
VOH = VCC - VOUT
30 VOL = VOUT - VEE
VOL (VCC = 5.5V)
25
20
VOH (VCC = 5.5V)
15
10
VOL (VCC = 1.8V)
VOH (VCC = 1.8V)
5
0
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
0
-150
VCC = 5.5V
-300
-450
-600 VCC = 2.4V
VCC = 1.8V
-750
-900
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
INPUT BIAS CURRENT vs. COMMON-MODE
VOLTAGE (VCC = 5.5V)
40
30
20
10
0
-10
-20
-30
-40
-0.5
0.5 1.5 2.5 3.5 4.5
COMMON-MODE VOLTAGE (V)
5.5
COMMON-MODE REJECTION
RATIO vs. TEMPERATURE
-65
0 ≤ VCM ≤ VCC
-70
-75 VCC = 1.8V
-80
-85 VCC = 5.5V
-90
-95
-100
-105
-55 -40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
Ultra-Small, +1.8V, µPower,
Rail-to-Rail I/O Op Amps
RISO
OUT
IN
MAX4240 RL CL
MAX4241
MAX4242
MAX4243
MAX4244
AV
=
RL
RL + RISO
≈
1
Figure 7a. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
100mV
IN
0
100mV
OUT
0
10µs/div
VCC = +2.4V, RL = 2kΩ TO VEE, CL = 1000pF
Figure 7b. Pulse Response Without Isolating Resistor
Driving Capacitive Loads
The MAX4291/MAX4292/MAX4294 are unity-gain stable
for loads up to 100pF (see the Load Resistor vs.
Capacitive Load graph in the Typical Operating
Characteristics). Applications that require greater
capacitive drive capability should use an isolation
resistor between the output and the capacitive load
(Figure 7). Note that this alternative results in a loss of
gain accuracy because RISO forms a voltage divider
with the load resistor.
Power-Supply Bypassing and Layout
The MAX4291/MAX4292/MAX4294 family operates from
either a single +1.8V to +5.5V supply or dual ±0.9V to
±2.75V supplies. For single-supply operation, bypass
the power supply with a 100nF capacitor to VEE (in this
case GND). For dual-supply operation, both the VCC
100mV
IN
0
100mV
OUT
0
10µs/div
VCC = +2.4V, RL = 2kΩ TO VEE, CL = 1000pF, RISO = 100Ω
Figure 7c. Pulse Response with Isolating Resistor (100 Ω)
and the VEE supplies should be bypassed to ground
with separate 100nF capacitors.
Good PC board layout techniques optimize perfor-
mance by decreasing the amount of stray capacitance
at the op amp’s inputs and output. To decrease stray
capacitance, minimize trace lengths and widths by
placing external components as close as possible to
the op amp. Surface-mount components are an excel-
lent choice.
Using the MAX4291/MAX4292/MAX4294
as Comparators
Although optimized for use as operational amplifiers,
the MAX4291/MAX4292/MAX4294 can also be used as
rail-to-rail I/O comparators. Typical propagation delay
depends on the input overdrive voltage, as shown in
Figure 8. External hysteresis can be used to minimize
the risk of output oscillation. The positive feedback cir-
cuit, shown in Figure 9, causes the input threshold to
change when the output voltage changes state. The
two thresholds create a hysteresis band that can be
calculated by the following equations:
V =V −V
HYST HI LO
V
HI
=
1
+
R1
R2
+
R1
R
HYST
V
REF
V
LO
=
V
HI
−
R1
R
HYST
V
CC
When the output of the comparator is low, the supply
current increases. The output stage has biasing circuit-
ry to monitor the output current. When the amplifier is
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX4291EXK-T.PDF ] | |
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