MAX4481 Maxim, MAX4481 Datasheet - Page 8

• Manufacturer Part Number: MAX4481
• Description: The MAX4480–MAX4483 low-cost, general-purpose op amps offer rail-to-rail outputs, draw only 50µA of quiescent current, and operate from a single +2
• Manufacturer: Maxim

circuit’s response by isolating the load capacitance
from the op amp’s output.
The MAX4481 features a low-power shutdown mode.
When SHDN goes low, the supply current drops to
0.05µA (typ) and the output enters a high-impedance
state. Pull SHDN high to enable the amplifier. Do not
leave SHDN floating. Figure 4 shows the shutdown
waveform.
The MAX4480–MAX4483 outputs typically settle within
50µs after power-up. Figure 5 shows the output voltage
on power-up and power-down.
Single/Dual/Quad, Low-Cost, Single-Supply,
Rail-to-Rail Op Amps with Shutdown
Figure 2. Small-Signal Transient Response with Excessive
Capacitive Load
Figure 4. Shutdown Waveform
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C
R
L
L
= 1nF
= 10MΩ TO V
Applications Information
SS
20µs/div
400µs/div
, C
L
= 25pF
Shutdown Mode
50mV/div
2V/div
Power-Up
The MAX4480–MAX4483 operate from a single +2.5V to
+5.5V power supply. Bypass the power supply with a
0.1µF capacitor to ground.
Good layout techniques optimize performance by
decreasing the amount of stray capacitance at the op
amp’s inputs and outputs. To decrease stray capaci-
tance, minimize trace lengths by placing external com-
ponents close to the op amp’s pins.
MAX4480/MAX4481 TRANSISTOR COUNT: 111
MAX4482 TRANSISTOR COUNT: 209
MAX4483 TRANSISTOR COUNT: 407
Figure 3. Capacitive-Load-Driving Circuit
Figure 5. Power-Up/Down Waveform
2V/div
1V/div
OUT
V
DD
Power Supplies and Layout
MAX4480
MAX4481
MAX4482
MAX4483
4µs/div
Chip Information
R
ISO
C
L