OPA656SLASH7 datasheet(14/26 Pages) TI2

14 / 26 page

OPA381

OPA2381

SBOS313B − AUGUST 2004 − REVISED NOVEMBER 2004

www.ti.com

OPA381

100

Ω

1nF

ADS8325

RC values shown are optimized for the

ADS8325

 values may vary for other ADCs.

Figure 13. Driving 16-Bit ADCs

INVERTING AMPLIFIER

Its excellent dc precision characteristics make the

OPA381 also useful as an inverting amplifier. Figure 14

shows it configured for use on a single-supply set to a

gain of 10.

OUT =

V+

OPA381

100k

Ω

10k

Ω

BIAS −

BIAS

Figure 14. Inverting Gain

PRECISION INTEGRATOR

With its low offset voltage, the OPA381 is well-suited for

use as an integrator. Some applications require a

means to reset the integration. The circuit shown in

Figure 15 uses a mechanical switch as the reset

mechanism. The switch is opened at the beginning of

the integration period. It is shown in the open position,

which is the integration mode. With the values of R1 and

C1 shown, the output changes −1V/s per volt of input.

OPA381

OUT

V+

Ω

SW1

BIAS

µF

Figure 15. Precision Integrator

DFN (DRB) THERMALLY-

ENHANCED PACKAGE

One of the package options for the OPA381 and

OPA2381 is the DFN-8 package, a thermally-enhanced

package designed to eliminate the use of bulky heat

sinks and slugs traditionally used in thermal packages.

The absence of external leads eliminates bent-lead

concerns and issues.

Although the power dissipation requirements of a given

application might not require a heat sink, for mechanical

reliability, the exposed power pad must be soldered to

the board and connected to V− (pin 4). This package

can be easily mounted using standard PCB assembly

techniques. See Application Note SLUA271, QFN/SON

PCB Attachment, located at www.ti.com. These DFN

packages have reliable solderability with either SnPb or

Pb-free solder paste.

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