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PDF MAX4044ESD Data sheet ( Hoja de datos )
| Número de pieza | MAX4044ESD | |
| Descripción | Single/Dual/Quad / Low-Cost / SOT23 / Micropower Rail-to-Rail I/O Op Amps | |
| Fabricantes | Maxim Integrated | |
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19-1377; Rev 0; 5/98
Single/Dual/Quad, Low-Cost, SOT23,
Micropower Rail-to-Rail I/O Op Amps
________________General Description
The MAX4040–MAX4044 family of micropower op amps
operates from a single +2.4V to +5.5V supply or dual
±1.2V to ±2.75V supplies and have Rail-to-Rail® input
and output capabilities. These amplifiers provide a
90kHz gain-bandwidth product while using only 10µA of
supply current per amplifier. The MAX4041/MAX4043
have a low-power shutdown mode that reduces supply
current to less than 1µA and forces the output into a
high-impedance state. The combination of low-voltage
operation, rail-to-rail inputs and outputs, and ultra-low
power consumption makes these devices ideal for any
portable/battery-powered system.
These amplifiers have outputs that typically swing to
within 10mV of the rails with a 100kΩ load. Rail-to-rail
input and output characteristics allow the full power-
supply voltage to be used for signal range. The combi-
nation of low input offset voltage, low input bias current,
and high open-loop gain makes them suitable for low-
power/low-voltage precision applications.
The MAX4040 is offered in a space-saving 5-pin SOT23
package. All specifications are guaranteed over the
-40°C to +85°C extended temperature range.
________________________Applications
Battery-Powered
Systems
Portable/Battery-Powered
Electronic Equipment
Digital Scales
Strain Gauges
Sensor Amplifiers
Cellular Phones
Notebook Computers
PDAs
____________________________Features
o Single-Supply Operation Down to +2.4V
o Ultra-Low Power Consumption:
10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4041/MAX4043)
o Rail-to-Rail Input Common-Mode Range
o Outputs Swing Rail-to-Rail
o No Phase Reversal for Overdriven Inputs
o 200µV Input Offset Voltage
o Unity-Gain Stable for Capacitive Loads up to 200pF
o 90kHz Gain-Bandwidth Product
o Available in Space-Saving 5-Pin SOT23 and
8-Pin µMAX Packages
Ordering Information
PART
MAX4040EUK-T
MAX4040EUA
MAX4040ESA
MAX4041ESA
MAX4041EUA
MAX4042EUA
MAX4042ESA
MAX4043EUB
MAX4043ESD
MAX4044ESD
TEMP. RANGE
PIN-
PACKAGE
SOT
TOP MARK
-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 SOT23-5
8 µMAX
8 SO
8 SO
8 µMAX
8 µMAX
ACGF
—
—
—
—
—
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
8 SO
10 µMAX
14 SO
14 SO
—
—
—
—
Selector Guide
PART
MAX4040
MAX4041
MAX4042
MAX4043
MAX4044
NO. OF
AMPS
SHUTDOWN
1—
1 Yes
2—
2 Yes
4—
PIN-PACKAGE
5-pin SOT23,
8-pin µMAX/SO
8-pin µMAX/SO
8-pin µMAX/SO
10-pin µMAX/
14-pin SO
14-pin SO
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
TOP VIEW
Pin Configurations
OUT 1
5 VCC
MAX4040
VEE 2
IN+ 3
4 IN-
SOT23-5
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 408-737-7600 ext. 3468.
1 page  
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VCC = +5.0V, VEE = 0, VCM = VCC / 2, SHDN = VCC, RL = 100kΩ to VCC / 2, TA = +25°C, unless otherwise noted.)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
400
300
INPUT BIAS CURRENT
INPUT BIAS CURRENT vs.
vs. TEMPERATURE
COMMON-MODE VOLTAGE (VCC = 2.4V)
0 5.0
VCM = 0
VCC = +2.4V
VCC = +2.4V
-1 2.5
200
-2
VCC = +5.5V
0
100 -3 -2.5
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
-4 -5.0
-60 -40 -20 0 20 40 60 80 100
0 0.2 0.6 1.0 1.4 1.8 2.2
TEMPERATURE (°C)
VCM (V)
INPUT BIAS CURRENT vs.
COMMON-MODE VOLTAGE (VCC = 5.5V)
5.0
VCC = +5.5V
2.5
OUTPUT SWING HIGH
vs. TEMPERATURE
120
RL TO VEE
100
80 VCC = +2.4V, RL = 10kΩ
0
-2.5
-5.0
0 0.5 1.5 2.5
3.5 4.5
5.5
VCM (V)
60 VCC = +5.5V, RL = 20kΩ
40
VCC = +5.5V, RL = 100kΩ
20
VCC = +2.4V, RL = 100kΩ
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
OUTPUT SWING LOW
vs. TEMPERATURE
120
RL TO VCC
100
80
60
VCC = +5.5V, RL = 20kΩ
40
VCC = +2.4V, RL = 10kΩ
20 VCC = +5.5V, RL = 100kΩ
VCC = +2.4V, RL = 100kΩ
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
COMMON-MODE REJECTION
vs. TEMPERATURE
-80
-85
-90 VCC = +2.4V
-95 VCC = +5.5V
-100
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
_______________________________________________________________________________________ 5
5 Page 
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
For example, a MAX4040 running from a single +2.4V
supply, operating at TA = +25°C, can source 240µA to
within 100mV of VCC and is capable of driving a 9.6kΩ
load resistor to VEE:
RL =
2.4V - 0.1V
240µA
= 9.6kΩ to VEE
The same application can drive a 4.6kΩ load resistor
when terminated in VCC / 2 (+1.2V in this case).
Driving Capacitive Loads
The MAX4040–MAX4044 are unity-gain stable for loads
up to 200pF (see Load Resistor vs. Capacitive Load
graph in Typical Operating Characteristics).
Applications that require greater capacitive drive capa-
bility should use an isolation resistor between the output
and the capacitive load (Figures 6a–6c). 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 MAX4040–MAX4044 family operates from either a
single +2.4V to +5.5V supply or dual ±1.2V 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
and 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 by placing exter-
nal components as close as possible to the op amp.
Surface-mount components are an excellent choice.
Using the MAX4040–MAX4044
as Comparators
Although optimized for use as operational amplifiers,
the MAX4040–MAX4044 can also be used as rail-to-rail
I/O comparators. Typical propagation delay depends
on the input overdrive voltage, as shown in Figure 7.
External hysteresis can be used to minimize the risk of
output oscillation. The positive feedback circuit, shown
in Figure 8, 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:
VHYST = VHI - VLO
VLO = VIN x R2 / (R1 + (R1 x R2 / RHYST) + R2)
VHI = [(R2 / R1 x VIN) + (R2 / RHYST) x VCC] /
(1 + R1 / R2 + R2 / RHYST)
RISO
MAX4040– RL CL
MAX4044
AV =
RL
RL + RISO
≈
1
Figure 6a. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
MAX4040/42/44 fig06b
50mV/div
IN
50mV/div
OUT
100µs/div
RISO = NONE, RL = 100kΩ, CL = 700pF
Figure 6b. Pulse Response without Isolating Resistor
MAX4040/42/44 fig06c
50mV/div
IN
50mV/div
OUT
100µs/div
RISO = 1kΩ, RL = 100kΩ, CL = 700pF
Figure 6c. Pulse Response with Isolating Resistor
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX4044ESD.PDF ] | |
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