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OTA FEATURES

DESCRIPTION

BUFFER FEATURES

OPA860 FEATURES

APPLICATIONS

OPA860

Wide Bandwidth

OPERATIONAL TRANSCONDUCTANCE

AMPLIFIER (OTA) and BUFFER

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• Wide Bandwidth (80MHz, Open-Loop, G = +5)

The OPA860 is a versatile monolithic component

designed for wide-bandwidth systems, including high

• High Slew Rate (900V/µs)

performance video, RF and IF circuitry. It includes a

• High Transconductance (95mA/V)

wideband,

bipolar

operational

transconductance

• External I

amplifier (OTA), and voltage buffer amplifier.

The OTA or voltage-controlled current source can be

viewed as an ideal transistor. Like a transistor, it has

• Closed-Loop Buffer

three terminals—a high impedance input (base), a

• Wide Bandwidth (1600MHz, V

low-impedance input/output (emitter), and the current

• High Slew Rate (4000V/µs)

output (collector). The OTA, however, is self-biased

and bipolar. The output collector current is zero for a

• 60mA Output Current

zero base-emitter voltage. AC inputs centered about

zero produce an output current, which is bipolar and

centered about zero. The transconductance of the

• Low Quiescent Current (11.2mA)

OTA can be adjusted with an external resistor,

• Versatile Circuit Function

allowing bandwidth, quiescent current, and gain

trade-offs to be optimized.

Also included in the OPA860 is an uncommited

• Baseline Restore Circuits

closed-loop,

unity-gain

buffer.

This

provides

• Video/Broadcast Equipment

1600MHz bandwidth and 4000V/µs slew rate.

• Communications Equipment

Used as a

basic

building

block,

the

OPA860

• High-Speed Data Acquisition

simplifies the design of AGC amplifiers, LED driver

• Wideband LED Driver

circuits for fiber optic transmission, integrators for fast

pulses, fast control loop amplifiers and control

• AGC-Multiplier

amplifiers for capacitive sensors and active filters.

• ns-Pulse Integrator

The OPA860 is available in an SO-8 surface-mount

• Control Loop Amplifier

package.

• OPA660 Upgrade

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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.