Single/Dual/Quad, Low-Power, Single-Supply,

Rail-to-Rail I/O Op Amps with Shutdown

12

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__________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

µs/div

Figure 6. Capacitive-Load-Driving Circuit

MAX4330

MAX4331

MAX4332

MAX4333

MAX4334

Figure 7. Power-Up/Shutdown Test Circuit

SHDN

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

100

Ω

2k

10k

2k

MAX4330

MAX4331

MAX4332

MAX4333

MAX4334

Figure 8. Power-Up/Down Output Voltage

1V/div

500mV/div

OUT

5

µs/div