OPA325IDBVR datasheet(19/42 Pages) TI1

19 / 42 page

OPAx325

+5V

0 …F

10 k

1 k

VCM = 2.5 V

VIN

OUT

OPA325, OPA2325, OPA4325

www.ti.com

SBOS637D – OCTOBER 2016 – REVISED JUNE 2019

Product Folder Links: OPA325 OPA2325 OPA4325

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The OPAx325 series features e-trim, a proprietary technique in which the offset voltage is adjusted during the

final steps of manufacturing. As a result, the OPAx325 deliver excellent offset voltage (40 μV, typical).

Additionally, the amplifier boasts a fast slew rate, low drift, low noise, and excellent PSRR and AOL. The

OPAx325 also feature a linear input stage with zero-crossover distortion, resulting in excellent CMRR over the

entire input range, which extends from 100 mV below the negative rail to 100 mV above the positive rail.

8.1.1 Operating Characteristics

The OPAx325 family of amplifiers has parameters that are fully specified from 2.2 V to 5.5 V (±1.1 V to ±2.75 V).

Many of the specifications apply from –40°C to +125°C. Parameters that can exhibit significant variance with

regard to operating voltage or temperature are presented in the Typical Characteristics section.

8.1.2 Basic Amplifier Configurations

The OPAx325 are unity-gain stable. The devices do not exhibit output phase inversion when the input is

overdriven. A typical single-supply connection is shown in Figure 44. The OPAx325 are configured as a basic

inverting amplifier with a gain of –10 V/V. This single-supply connection has an output centered on the common-

mode voltage, VCM. For the circuit shown, this voltage is 2.5 V, but can be any value within the common-mode

input voltage range.

Figure 44. Basic Single-Supply Connection

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