OPA4350EA datasheet(10/29 Pages) TI

Part #	OPA4350EA

Description	High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifierSeries

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Manufacturer	TI [Texas Instruments]

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OPA350

OPA2350

OPA4350

SBOS099C − SEPTEMBER 2000 − REVISED JANUARY 2005

www.ti.com

10

V

BIAS1

V

BIAS2

V

IN+

V

IN−

Class AB

Control

Circuitry

V

O

V

−

(Ground)

V+

Reference

Current

Figure 2. Simplified Schematic

5k

Ω

OPAx350

10mA max

V+

V

IN

V

OUT

I

OVERLOAD

Figure 3. Input Current Protection for Voltages

Exceeding the Supply Voltage

RAIL-TO-RAIL OUTPUT

A class AB output stage with common-source

transistors is used to achieve rail-to-rail output. For light

resistive loads (>10k

Ω), the output voltage swing is

typically ten millivolts from the supply rails. With heavier

resistive loads (600

Ω to 10kΩ), the output can swing to

within a few tens of millivolts from the supply rails and

maintain high

open-loop

gain.

See

the

typical

characteristics Output Voltage Swing vs Output Current

and Open-Loop Gain vs Output Voltage.

CAPACITIVE LOAD AND STABILITY

OPA350 series op amps can drive a wide range of

capacitive loads. However, all op amps under certain

conditions

may

become

unstable.

Op

amp

configuration, gain, and load value are just a few of the

factors to consider when determining stability. An op

amp in unity-gain configuration is the most susceptible

to the effects of capacitive load. The capacitive load

reacts with the op amp’s output impedance, along with

any additional load resistance, to create a pole in the

small-signal response that degrades the phase margin.

In unity gain, OPA350 series op amps perform well with

very large capacitive loads. Increasing gain enhances

the amplifier’s ability to drive more capacitance. The

typical

characteristic

Small-Signal

Overshoot

vs

Capacitive Load shows performance with a 1k

Ω

resistive load. Increasing load resistance improves

capacitive load drive capability.

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