Datasheet

Applications Information
Shutdown Mode
The MAX4401 features a low-power shutdown mode.
When SHDN goes low, the supply current drops to 20pA
(typ) and the output enters a high-impedance state. Pull
SHDN high to enable the amplifier. Do not leave SHDN
unconnected. Figure 4 shows the shutdown waveform.
Power-Up
The MAX4400–MAX4403 outputs typically settle within
5µs after power-up. Figure 5 shows the output voltage on
power-up and power-down.
Power Supplies and Layout
The MAX4400–MAX4403 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 capacitance,
minimize trace lengths by placing external components
close to the op amp’s pins.
Figure 5. Power-Up/Power-Down WaveformFigure 4. Shutdown Waveform
Figure 3. Capacitive-Load-Driving CircuitFigure 2. Small-Signal Transient Response with Excessive
Capacitive Load
10µs/div
OUT
1V/div
V
DD
2V/div
R
L
= 10MΩ TO GND
C
L
= 25pF
400µs/div
SHDN
2V/div
OUT
R
ISO
C
L
MAX4400
MAX4401
MAX4402
MAX4403
2µs/div
IN
50mV/div
OUT
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Maxim Integrated │ 8
MAX4400–MAX4403 Single/Dual/Quad, Low-Cost, Single-Supply,
Rail-to-Rail Op Amps with Shutdown