The OPA861 is a versatile monolithic component designed for wide-bandwidth systems, including high performance video, RF and IF circuitry. The OPA861 is a wideband, bipolar operational transconductance amplifier (OTA).

The OTA or voltage-controlled current source can be viewed as an ideal transistor. Like a transistor, it has three terminals—a high impedance input (base), a low-impedance input/output (emitter), and the current output (collector). The OPA861, however, is self-biased and bipolar. The output collector current is zero for a zero base-emitter voltage. AC inputs centered about zero produce an output current, which is bipolar and centered about zero. The transconductance of the OPA861 can be adjusted with an external resistor, allowing bandwidth, quiescent current, and gain trade-offs to be optimized.

Used as a basic building block, the OPA861 simplifies the design of AGC amplifiers, LED driver circuits for fiber optic transmission, integrators for fast pulses, fast control loop amplifiers and control amplifiers for capacitive sensors, and active filters. The OPA861 is available in SO-8 and SOT23-6 surface-mount packages.

open-in-new

Find other Transconductance amplifiers

Download

Technical documentation

= Top documentation for this product selected by TI

No results found. Please clear your search and try again.

View all 5

	Type	Title	Date
*	Datasheet	Wide Bandwidth Operational Transconductance Amplifier (OTA) datasheet (Rev. G)	May 14, 2013
	Technical articles	Wanted: Stable oscillator	Jul. 31, 2013
	Application note	Demystifying the Operational Transconductance Amplifier (Rev. A)	Apr. 16, 2013
	User guide	DEM-OTA-SO-1A User's Guide (Rev. A)	Feb. 02, 2006
	Application note	Noise Analysis for High Speed Op Amps (Rev. A)	Jan. 17, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download

Unpopulated PCB Compatible w/Wide Bandwidth Transconductance Op Amps in 8-lead SOIC (D) Pkg

DEM-OTA-SO-1A

document-generic

User guide

Description

The DEM-OTA-SO-1A demonstration fixture helps designers evaluate the operation and performance of TI's Wide Bandwidth Operational Transconductance Amplifiers (OTA). This unpopulated PC board is compatible with products offered in the 8-lead SOIC (D) package.

For more information on these types of (...)

View details

Design tools & simulation

SIMULATION MODEL Download

OPA861 PSpice Model

SBOC127.ZIP (2 KB) - PSpice Model

Download

View details

SIMULATION TOOL Download

PSpice® for TI design and simulation tool

PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)

Request

Features

Leverages Cadence PSpice Technology
Preinstalled library with a suite of digital models to enable worst-case timing analysis
Dynamic updates ensure you have access to most current device models
Optimized for simulation speed without loss of accuracy
Supports simultaneous analysis of multiple products
(...)

View details

SIMULATION TOOL Download

SPICE-based analog simulation program

TINA-TI — TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)

document-generic

User guide

View options

View details