Rainbow Electronics MAX4334 - Manual (Page 12)

MAX4330–MAX4334
Single/Dual/Quad, Low-Power, Single-Supply,
Rail-to-Rail I/O Op Amps with Shutdown
12 ______________________________________________________________________________________
__________Applications Information
Power-Up
The MAX4330–MAX4334 outputs typically settle within
5µs after power-up. Using the test circuit of Figure 7,
Figures 8 and 9 show the output voltage and supply
current on power-up and power-down.
Shutdown Mode
The MAX4331/MAX4333 feature a low-power shutdown
mode. When the shutdown pin (SHDN) is pulled low, the
supply current drops to 9µA per amplifier (typical), the
amplifier is disabled, and the outputs enter a high-
impedance state. Pulling SHDN high or leaving it float-
ing enables the amplifier. Figures 10 and 11 show the
MAX4331/MAX4333’s output voltage and supply-current
responses to a shutdown pulse.
Figure 5. Small-Signal Transient Response with Excessive
Capacitive Load and Isolation Resistor
IN 50mV/div
50mV/div OUT
2 µ s/div
A
V
= +1, C
L
= 510pF
R
ISO
= 39 Ω
Figure 6. Capacitive-Load-Driving Circuit
R
ISO
C L
MAX4330
MAX4331
MAX4332
MAX4333
MAX4334
Figure 7. Power-Up/Shutdown Test Circuit
SHDN
V OUT
0V TO +2.7V
STEP FOR
SHUTDOWN
TEST
0V TO +2.7V STEP
FOR POWER-UP
TEST, +2.7V STEP
FOR SHUTDOWN-
ENABLE TEST
SUPPLY-CURRENT
MONITORING POINT
V CC
100 Ω 2k 10k
2k
MAX4330
MAX4331
MAX4332
MAX4333
MAX4334
Figure 8. Power-Up/Down Output Voltage
V
CC
1V/div
500mV/div OUT
5 µ s/div