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PDF MAX4244ESD Data sheet ( Hoja de datos )
| Número de pieza | MAX4244ESD | |
| Descripción | Single/Dual/Quad / !.8V/10A / SOT23 / Beyond-the-Rails Op Amps | |
| Fabricantes | Maxim Integrated | |
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19-1343; Rev 0; 3/98
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
________________General Description
The MAX4240–MAX4244 family of micropower op amps
operate from a single +1.8V to +5.5V supply or dual
±0.9V to ±2.75V supplies and have Beyond-the-Rails™
inputs and Rail-to-Rail® output capabilities. These
amplifiers provide a 90kHz gain-bandwidth product
while using only 10µA of supply current per amplifier.
The MAX4241/MAX4243 have a low-power shutdown
mode that reduces supply current to less than 1µA and
forces the output into a high-impedance state. 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, beyond-the-
rails inputs, rail-to-rail outputs, and ultra-low power con-
sumption makes these devices ideal for any portable/
two-cell battery-powered system.
These amplifiers have an input common-mode range
that extends 200mV beyond each rail, and their outputs
typically swing to within 9mV of the rails with a 100kΩ
load. Beyond-the-rails input and rail-to-rail output char-
acteristics allow the full power-supply voltage to be
used for signal range. The combination of low input off-
set voltage, low input bias current, and high open-loop
gain makes them suitable for low-power/low-voltage
precision applications.
The MAX4240 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
Two-Cell Battery-
Powered Systems
Portable/Battery-Powered
Electronic Equipment
Digital Scales
Strain Gauges
Sensor Amplifiers
Cellular Phones
Notebook Computers
PDAs
_____________________Selector Guide
PART
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
NO. OF
AMPS
1
1
2
SHUTDOWN
—
Yes
—
2 Yes
4—
PIN-PACKAGE
5-pin SOT23
8-pin µMAX/SO
8-pin µMAX/SO
10-pin µMAX,
14-pin SO
14-pin SO
Beyond-the-Rails is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
____________________________Features
o Ultra-Low-Voltage Operation:
Guaranteed Down to +1.8V
Typical Operation to +1.5V
o Ultra-Low Power Consumption:
10µA Supply Current per Amplifier
1µA Shutdown Mode (MAX4241/MAX4243)
Up to 200,000 Hours Operation from Two AA
Alkaline Cells
o Beyond-the-Rails 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
TEMP. RANGE
MAX4240EUK-T -40°C to +85°C
MAX4241EUA -40°C to +85°C
MAX4241ESA -40°C to +85°C
MAX4242EUA -40°C to +85°C
MAX4242ESA -40°C to +85°C
MAX4243EUB -40°C to +85°C
MAX4243ESD -40°C to +85°C
MAX4244ESD -40°C to +85°C
PIN-
PACKAGE
5 SOT23-5
8 µMAX
8 SO
8 µMAX
8 SO
10 µMAX
14 SO
14 SO
SOT
TOP MARK
ACCS
—
—
—
—
—
—
—
_________________Pin Configurations
TOP VIEW
OUT 1
5 VCC
MAX4240
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, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
ELECTRICAL CHARACTERISTICS — TA = TMIN to TMAX (continued)
(VCC = +1.8V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC / 2, RL = 100kΩ tied to VCC / 2, SHDN = VCC, TA = TMIN to TMAX, unless oth-
erwise noted.) (Note 1)
PARAMETER
Common-Mode
Rejection Ratio
(Note 4)
Power-Supply
Rejection Ratio
Large-Signal
Voltage Gain
Output Voltage
Swing High
Output Voltage
Swing Low
Output Leakage
Current in Shutdown
(Notes 2, 5)
SHDN Logic Low
(Note 2)
SYMBOL
CMRR
PSRR
AVOL
VOH
VOL
CONDITIONS
MAX4241ESA
VCC = 1.8V
MAX4242ESA/MAX4243ESD/
MAX4244ESD
MAX4240EUK/MAX424_EUA/
MAX4243EUB
MAX4241ESA
VCC = 5.0V
MAX4242ESA/MAX4243ESD/
MAX4244ESD
MAX4240EUK/MAX424_EUA/
MAX4243EUB
MAX4241ESA
1.8V ≤ VCC ≤ 5.5V
MAX4242ESA/MAX4243ESD/
MAX4244ESD
MAX4240EUK/MAX424_EUA/
MAX4243EUB
(VEE + 0.2V) ≤ VOUT ≤
(VCC - 0.2V)
Specified as
VCC - VOH
Specified as
VEE - VOL
VCC = 1.8V
VCC = 5.0V
VCC = 1.8V
VCC = 5.0V
VCC = 1.8V
VCC = 5.0V
RL = 100kΩ
RL = 10kΩ
RL = 100kΩ
RL = 10kΩ
RL = 100kΩ
RL = 10kΩ
RL = 100kΩ
RL = 10kΩ
RL = 100kΩ
RL = 10kΩ
RL = 100kΩ
RL = 10kΩ
MIN
68
68
64
74
74
70
76
76
74
76
66
84
76
IOUT(SHDN) SHDN = VEE = 0, VCC = 5.5V
VIL
TYP MAX UNITS
dB
dB
dB
25
95
dB
30
145
20
50
dB
25
75
100 nA
0.3 x VCC V
_______________________________________________________________________________________ 5
5 Page 
Single/Dual/Quad, +1.8V/10µA, SOT23,
Beyond-the-Rails Op Amps
In the region where the differential input voltage
approaches 1.8V, the input resistance decreases expo-
nentially from 45MΩ to 4.4kΩ as the diode block begins
conducting. Conversely, the bias current increases with
the same curve.
Rail-to-Rail Output Stage
The MAX4240–MAX4244 output stage can drive up to a
10kΩ load and still swing to within 40mV of the rails.
Figure 3 shows the output voltage swing of a MAX4240
configured as a unity-gain buffer, powered from a single
+2V supply voltage. The output for this setup typically
swings from (VEE + 6mV) to (VCC - 8mV) with a 100kΩ
load.
__________Applications Information
Power-Supply Considerations
The MAX4240–MAX4244 operate from a single +1.8V
to +5.5V supply (or dual ±0.9V to ±2.75V supplies) and
consume only 10µA of supply current per amplifier. A
high power-supply rejection ratio of 90dB allows the
amplifiers to be powered directly off a decaying battery
voltage, simplifying design and extending battery life.
The MAX4240–MAX4244 are ideally suited for use with
most battery-powered systems. Table 1 lists a variety of
typical battery types showing voltage when fresh, volt-
age at end-of-life, capacity, and approximate operating
time from a MAX4240/MAX4241, assuming nominal
conditions for both normal and shutdown modes.
Although the amplifiers are fully guaranteed over tem-
perature for operation down to a +1.8V single supply,
even lower-voltage operation is possible in practice.
Figures 4 and 5 show the PSRR and supply current as
a function of supply voltage and temperature.
Power-Up Settling Time
The MAX4240–MAX4244 typically require 200µs to
power up after VCC is stable. During this start-up time,
the output is indeterminant. The application circuit
should allow for this initial delay.
Shutdown Mode
The MAX4241 (single) and MAX4243 (dual) feature a
low-power shutdown mode. When the shutdown pin
(SHDN) is pulled low, the supply current drops to 1µA
per amplifier, the amplifier is disabled, and the outputs
enter a high-impedance state. Pulling SHDN high or
leaving it floating enables the amplifier. Take care to
ensure that parasitic leakage current at the SHDN pin
does not inadvertently place the part into shutdown
mode when SHDN is left floating. Figure 6 shows the
output voltage response to a shutdown pulse. The logic
threshold for SHDN is always referred to VCC / 2 (not to
1V/div
RL = 100kΩ TIED TO VEE
VIN = 2.0V
fIN = 1kHz
MAX4240-44 fig03
OUT
1V/div
IN
200µs/div
Figure 3. Rail-to-Rail Input/Output Voltage Range
100
TA = +85°C
90
80
70
60
1.0
TA = -40°C
TA = +25°C
1.2 1.4 1.6 1.8
SUPPLY VOLTAGE (V)
2.0
Figure 4. Power-Supply Rejection Ratio vs. Supply Voltage
12
10
8
TA = +85°C
6
4 TA = -40°C
TA = +25°C
2
0
1.0
1.2 1.4 1.6 1.8
SUPPLY VOLTAGE (V)
Figure 5. Supply Current vs. Supply Voltage
2.0
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX4244ESD.PDF ] | |
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