Datasheet
Applications Information
Shutdown Mode
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.
Power-Up
The MAX4480–MAX4483 outputs typically settle within
50μs after power-up. Figure 5 shows the output voltage
on power-up and power-down.
Power Supplies and Layout
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 capacitance,
minimize trace lengths by placing external components
close to the op amp’s pins.
Figure 2. Small-Signal Transient Response with Excessive
Capacitive Load
Figure 4. Shutdown Waveform
Figure 3. Capacitive-Load-Driving Circuit
Figure 5. Power-Up/Down Waveform
20µs/div
50mV/div
C
L
= 1nF
R
ISO
C
L
MAX4480
MAX4481
MAX4482
MAX4483
400µs/div
2V/div
R
L
= 10MΩ TO V
SS
, C
L
= 25pF
4µs/div
OUT
1V/div
V
DD
2V/div
MAX4480–MAX4483 Single/Dual/Quad, Low-Cost, Single-Supply,
Rail-to-Rail Op Amps with Shutdown
www.maximintegrated.com
Maxim Integrated
│
8
Chip Information
PROCESS: BiCMOS