OPA2810 Datasheet, PDF (14/26 Pages) Texas Instruments – OPA2810 Dual High-Performance, Low-Power, Wide Supply Range, Rail-to-Rail Input/Output FET-Input Operational Amplifier

OPA2810
SBOS789 – AUGUST 2017
7 Detailed Description
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7.1 Overview
The OPA2810 is a dual-channel, FET-input, voltage-feedback operational amplifier with extremely low input bias
current. The OPA2810 is unity-gain stable with a small-signal unity-gain bandwidth of 120 MHz, and offers both
excellent DC precision and dynamic AC performance at very low quiescent power. The OPA2810 is fabricated on
Texas Instrument's proprietary, high-speed SiGe BiCMOS process and achieves significant performance
improvements over comparable FET-input amplifiers at similar levels of quiescent power. With a gain-bandwidth
product (GBWP) of 70MHz, extremely high slew-rate (240 V/µs), and very low-noise (5.7 nV/√Hz) the OPA2810
is ideal in a wide range of data acquisition and signal processing applications. It achieves these benchmark
levels of performance while consuming a typical quiescent current (I_Q) of 3.6mA /channel.
The OPA2810 can source and sink large amounts of current without degrading its linearity performance. The
wide-bandwidth of the OPA2810 implies that it has very low output-impedance across a wide frequency range
thereby allowing the amplifier to drive capacitive loads up to 35 pF without the need for any output isolation.
7.2 Functional Block Diagram
The OPA2810 is a classic voltage feedback op amp and each channel has two high-impedance inputs and a
low-impedance output. Standard application circuits are supported like the two basic options shown in Figure 1
and Figure 1. The DC operating point for each configuration is level-shifted by the reference voltage V_REF which
is typically set to mid-supply in single-supply operation. V_REF is often connected to ground in split-supply
applications.
VSIG
VREF
VIN
RG
VREF
VS+
+
±
VS-
RF
VOUT
(1+RF/RG)VSIG
VREF
Figure 1. Noninverting Amplifier
VSIG
VREF
VREF
VIN
RG
VS+
+
±
VS-
VOUT
-(RF/RG)VSIG
VREF
RF
Figure 2. Inverting Amplifier
14
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