Rainbow-electronics MAX4329 Manual do Utilizador descarregar pdf (Página 10)

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

Figure 4. Capacitive-Load Stability

MAX4322/MAX4323/MAX4326/MAX4327/MAX4329

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

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

10 ______________________________________________________________________________________

TIME (400ns/div)

VOLTAGE (50mV/div)

OUT

= +1

= 500pF

Figure 5. Small-Signal Transient Response with

Capacitive Load

TIME (400ns/div)

VOLTAGE (50mV/div)

OUT

= +1

= 1000pF

= 39Ω

Figure 6. Transient Response to Capacitive Load with

Isolation Resistor

TIME (2µs/div)

VOLTAGE (1V/div)

OUT

= 3V

= +1

10,000

100

100 1k 100k10k

RESISTIVE LOAD (

Ω)

CAPACITIVE LOAD (pF)

1000

UNSTABLE

REGION

TO V

OUT

= V

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.

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