OPA2316 Datasheet, PDF (16/46 Pages) Texas Instruments – OPAx316 10-MHz, Low-Power, Low-Noise, RRIO, 1.8-V CMOS Operational Amplifier

OPA316, OPA2316, OPA2316S, OPA4316
SBOS703D – APRIL 2014 – REVISED DECEMBER 2014
7 Detailed Description
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7.1 Overview
The OPA316 is a family of low-power, rail-to-rail input and output operational amplifiers. These devices operate
from 1.8 V to 5.5 V, are unity-gain stable, and are 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 OPA316 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 OPA316 features 10-MHz bandwidth and 6-V/μs slew rate with only 400-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 11 nV/√Hz at 1 kHz, low input bias current (5 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 OPA316 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 illustrated in the Typical Characteristics graphs.
7.3.2 Rail-to-Rail Input
The input common-mode voltage range of the OPA316 series extends 200 mV beyond the supply rails for supply
voltages greater than 2.5 V. This performance is achieved with a complementary input stage: an N-channel input
differential pair in parallel with a P-channel differential pair, as shown in the Functional Block Diagram section.
The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 1.4 V to 200 mV above
the positive supply, whereas the P-channel pair is active for inputs from 200 mV below the negative supply to
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