OPA376-Q1_16 Datasheet, PDF (14/34 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier

OPA376-Q1, OPA2376-Q1, OPA4376-Q1
SBOS549A – APRIL 2011 – REVISED JANUARY 2016
7 Detailed Description
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7.1 Overview
The OPA376-Q1 family belongs to a new generation of low-noise operational amplifiers with e-trim, giving
customers outstanding dc precision and ac performance. Low noise, rail-to-rail input and output, and low offset,
drawing a low quiescent current, make these devices ideal for a variety of precision and portable applications. In
addition, this device has a wide supply range with excellent PSRR, making it a suitable option for applications
that are battery-powered without regulation.
7.2 Functional Block Diagram
V+
OPAx376
-IN
OUT
+IN
POR
e-trim
V-
7.3 Feature Description
The OPAx376-Q1 family of precision amplifiers offers excellent dc performance as well as excellent ac
performance. Operating from a single power-supply the OPAx376-Q1 is capable of driving large capacitive loads,
has a wide input common-mode voltage range, and is well-suited to drive the inputs of successive-approximation
response (SAR) analog-to-digital converters (ADCs) as well as 24-bit and higher resolution converters. Including
internal ESD protection, the OPAx376-Q1 family is offered in a variety of industry-standard packages, including a
wafer chip-scale package for applications that require space savings.
7.3.1 Operating Voltage
The OPAx376-Q1 family of amplifiers operate over a power-supply range of 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.
7.3.2 Input Offset Voltage and Input Offset Voltage Drift
The OPAx376-Q1 family of operational amplifiers is manufactured using TI's e-trim technology. Each amplifier is
trimmed in production, thereby minimizing errors associated with input offset voltage and input offset voltage drift.
The e-trim technology is a TI proprietary method of trimming internal device parameters during either wafer
probing or final testing.
7.3.3 Capacitive Load and Stability
The OPAx376-Q1 series of amplifiers may be used in applications where driving a capacitive load is required. As
with all op amps, there may be specific instances where the OPAx376-Q1 can become unstable, leading to
oscillation. The particular op amp circuit configuration, layout, gain, and output loading are some of the factors to
consider when establishing whether an amplifier will be stable in operation. An op amp in the unity-gain (1-V/V)
buffer configuration and driving a capacitive load exhibits a greater tendency to be unstable than an amplifier
operated at a higher noise gain. The capacitive load, in conjunction with the op amp output resistance, creates a
pole within the feedback loop that degrades the phase margin. The degradation of the phase margin increases
as the capacitive loading increases.
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