MAX4044 데이터 시트보기 (PDF) - Maxim Integrated
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MAX4044 Datasheet PDF : 16 Pages
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Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
1V/div
RL = 100kΩ TIED TO VEE
VIN = 4.0V
fIN = 1kHz
MAX4040-44 fig03
OUT
SHDN
VIN = 2V
RL = 100kΩ TIED TO VEE
MAX4040-44 fig04
5V/div
1V/div
IN
OUT
1V/div
200µs/div
200µs/div
Figure 3. Rail-to-Rail Input/Output Voltage Range
Shutdown Mode
The MAX4041 (single) and MAX4043 (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 4 shows the
output voltage response to a shutdown pulse. The logic
threshold for SHDN is always referred to VCC / 2 (not to
GND). When using dual supplies, pull SHDN to VEE to
enter shutdown mode.
Load-Driving Capability
The MAX4040–MAX4044 are fully guaranteed over tem-
perature and supply voltage to drive a maximum resis-
tive load of 25kΩ to VCC / 2, although heavier loads can
be driven in many applications. The rail-to-rail output
stage of the amplifier can be modeled as a current
source when driving the load toward VCC, and as a cur-
rent sink when driving the load toward VEE. The magni-
tude of this current source/sink varies with supply
voltage, ambient temperature, and lot-to-lot variations
of the units.
Figures 5a and 5b show the typical current source and
sink capability of the MAX4040–MAX4044 family as a
function of supply voltage and ambient temperature.
The contours on the graph depict the output current
value, based on driving the output voltage to within
50mV, 100mV, and 200mV of either power-supply rail.
Figure 4. Shutdown Enable/Disable Output Voltage
1200
VCC = 5.5V, VOH = 200mV
1000
800
VCC = 2.4V,
VOH = 200mV
VCC = 5.5V, VOH = 100mV
600
400
VCC = 2.4V,
VOH = 100mV
200
VCC = 5.5V, VOH = 50mV
0
VCC = 2.4V, VOH = 50mV
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Figure 5a. Output Source Current vs. Temperature
3000
2500
VCC = 5.5V, VOL = 200mV
2000
VCC = 2.4V, VOL = 200mV
1500
VCC = 5.5V,
VOL = 100mV
1000
VCC = 2.4V, VOL = 100mV
500 VCC = 5.5V, VOL = 50mV
0
VCC = 2.4V, VOL = 50mV
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Figure 5b. Output Sink Current vs. Temperature
10 ______________________________________________________________________________________
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