OPA171 datasheet(13/25 Pages) TI1

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Output

Time(100 s/div)

+18V

-18V

37V

SineWave

( 18.5V)

OPA171

OPA2171

OPA4171

www.ti.com

SBOS516B – SEPTEMBER 2010 – REVISED NOVEMBER 2010

APPLICATION INFORMATION

The OPAx171 family of operational amplifiers provide

This device can operate with full rail-to-rail input

high overall performance, making them ideal for many

100mV beyond the top rail, but with reduced

general-purpose applications. The excellent offset

performance within 2V of the top rail. The typical

drift of only 2µV/°C provides excellent stability over

performance in this range is summarized in Table 2.

the entire temperature range. In addition, the device

offers very good overall performance with high

PHASE-REVERSAL PROTECTION

CMRR, PSRR, and AOL. As with all amplifiers,

The OPAx171 family has an internal phase-reversal

applications with noisy or high-impedance power

protection. Many op amps exhibit a phase reversal

supplies require decoupling capacitors close to the

when

the

input

driven

beyond

its

linear

device pins. In most cases, 0.1µF capacitors are

common-mode range. This condition is most often

adequate.

encountered in noninverting circuits when the input is

driven beyond the specified common-mode voltage

OPERATING CHARACTERISTICS

range, causing the output to reverse into the opposite

The OPAx171 family of amplifiers is specified for

rail. The input of the OPAx171 prevents phase

operation from 2.7V to 36V (±1.35V to ±18V). Many

reversal

with

excessive

common-mode

voltage.

of the specifications apply from –40°C to +125°C.

Instead, the output limits into the appropriate rail. This

Parameters that can exhibit significant variance with

performance is shown in Figure 37.

regard to operating voltage or temperature are

presented in the Typical Characteristics.

GENERAL LAYOUT GUIDELINES

For best operational performance of the device, good

printed circuit board (PCB) layout practices are

recommended. Low-loss, 0.1µF bypass capacitors

should be connected between each supply pin and

ground, placed as close to the device as possible. A

single bypass capacitor from V+ to ground is

applicable to single-supply applications.

COMMON-MODE VOLTAGE RANGE

The input common-mode voltage range of the

Figure 37. No Phase Reversal

OPAx171 series extends 100mV below the negative

rail and within 2V of the top rail for normal operation.

Table 2. Typical Performance Range

PARAMETER

MIN

TYP

MAX

UNIT

Input Common-Mode Voltage

(V+) – 2

(V+) + 0.1

Offset voltage

vs Temperature

µV/°C

Common-mode rejection

Open-loop gain

GBW

0.7

MHz

Slew rate

0.7

V/µs

Noise at f = 1kHz

nV/

√Hz

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