OPA314_15 Datasheet, PDF (16/45 Pages) Texas Instruments – OPAx314 3-MHz, Low-Power, Low-Noise, RRIO, 1.8-V CMOS Operational Amplifier

OPA314, OPA2314, OPA4314
SBOS563G – MAY 2011 – REVISED JUNE 2015
7 Detailed Description
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7.1 Overview
The OPA314 is a family of low-power, rail-to-rail input and output operational amplifiers specifically designed for
portable applications. These devices operate from 1.8 V to 5.5 V, are unity-gain stable, and suitable for a wide
range of general-purpose applications. The class AB output stage is capable of driving ≤ 10-kΩ loads connected
to any point between V+ and ground. The input common-mode voltage range includes both rails, and allows the
OPA314 series to be used in virtually any single-supply application. Rail-to-rail input and output swing
significantly increases dynamic range, especially in low-supply applications, and makes them ideal for driving
sampling analog-to-digital converters (ADCs).
The OPA314 features 3-MHz bandwidth and 1.5-V/μs slew rate with only 150-μA supply current per channel,
providing good AC performance at very low power consumption. DC applications are also well served with a very
low input noise voltage of 14 nV/√Hz at 1 kHz, low input bias current (0.2 pA), and an input offset voltage of
0.5 mV (typical).
7.2 Functional Block Diagram
V+
Reference
Current
V_IN+
V_IN-
V_BIAS1
Class AB
Control
V_O
Circuitry
V_BIAS2
V-
(Ground)
7.3 Feature Description
7.3.1 Operating Voltage
The OPA314 series operational amplifiers are fully specified and ensured for operation from 1.8 V to 5.5 V. In
addition, many specifications apply from –40°C to 125°C. Parameters that vary significantly with operating
voltages or temperature are shown in the Typical Characteristics graphs. Power-supply pins should be bypassed
with 0.01-μF ceramic capacitors.
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