MAX4327EUB(1999) View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX4327EUB
(Rev.:1999)

Single/Dual/Quad, Low-Cost, SOT23, Low-Power, Rail-to-Rail I/O Op Amps

Maxim Integrated 

Single/Dual/Quad, Low-Cost, SOT23,

Low-Power, Rail-to-Rail I/O Op Amps

Power-Up and Shutdown Mode

The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329

amplifiers typically settle within 1µs after power-up.

Using the test circuit of Figure 8, Figures 9 and 10 show

the output voltage and supply current on power-up.

The MAX4323 and MAX4327 have a shutdown option.

When the shutdown pin (SHDN) is pulled low, the sup-

ply current drops below 25µA per amplifier and the

amplifiers are disabled with the outputs in a high-

impedance state. Pulling SHDN high or leaving it float-

ing enables the amplifier. In the dual-amplifier

MAX4327, the shutdown functions operate indepen-

dently. Figures 11 and 12 show the output voltage and

supply current responses of the MAX4323 to a shut-

down pulse.

Power Supplies and Layout

The MAX4322/MAX4323/MAX4326/MAX4327/MAX4329

operate from a single +2.4V to +6.5V power supply, or

from dual supplies of ±1.2V to ±3.25V. For single-supply

operation, bypass the power supply with a 0.1µF

ceramic capacitor in parallel with at least 1µF. For dual

supplies, bypass each supply to ground.

Good layout improves performance by decreasing the

amount of stray capacitance at the op amp’s inputs

and outputs. To decrease stray capacitance, minimize

trace lengths and resistor leads by placing external

components close to the op amp’s pins.

VCC = 3V

IN AV = +1

OUT

TIME (2µs/div)

Figure 3. Rail-to-Rail Input /Output Voltage Range

AV = +1

CL = 500pF

IN

10,000

1000

UNSTABLE

REGION

RL TO VEE

VOUT = VCC/2

100

100

1k

10k

100k

RESISTIVE LOAD (Ω)

Figure 4. Capacitive-Load Stability

AV = +1

CL = 1000pF

RS = 39Ω

IN

OUT

OUT

TIME (400ns/div)

Figure 5. Small-Signal Transient Response with

Capacitive Load

TIME (400ns/div)

Figure 6. Transient Response to Capacitive Load with

Isolation Resistor

10 ______________________________________________________________________________________

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