BurrBrown Products

from Texas Instruments

FEATURES

DESCRIPTION

APPLICATIONS

0

−10

−20

−30

−40

−50

−60

−70

−80

Frequency (Hz)

1k

10k

100k

1M

10M

100M

1G

C

1

C

2

V

IN

R

R

V

OUT

Low−Pass Negative Impedance Converter (NIC) Filter

Frequency Response of 20kHz and 10MHz

Low−Pass NIC Filters

20kHz

Low−Pass Filter

10MHz

Low−Pass Filter

OPA861

SBOS338 – AUGUST 2005

Wide Bandwidth

OPERATIONAL TRANSCONDUCTANCE

AMPLIFIER (OTA)

•

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

The OPA861 is a versatile monolithic component

designed for wide-bandwidth systems, including high

•

High Slew Rate (900V/µs)

performance video, RF and IF circuitry. The OPA861

•

High Transconductance (95mA/V)

is a wideband, bipolar operational transconductance

•

amplifier (OTA).

•

Low Quiescent Current (5.4mA)

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

•

Video/Broadcast Equipment

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

output

(collector).

The

OPA861,

however,

is

•

Communications Equipment

self-biased and bipolar. The output collector current is

•

High-Speed Data Acquisition

zero for a zero base-emitter voltage. AC inputs

•

Wideband LED Drivers

centered about zero produce an output current, which

•

Control Loop Amplifiers

is

bipolar

and

centered

about

zero.

The

•

Wideband Active Filters

transconductance of the OPA861 can be adjusted

with an external resistor, allowing bandwidth, quiesc-

•

Line Drivers

ent current, and gain trade-offs to be optimized.

Used as a basic building block, the OPA861 sim-

plifies the design of AGC amplifiers, LED driver

circuits for fiber optic transmission, integrators for fast

pulses, fast control loop amplifiers and control ampli-

fiers for capacitive sensors and active filters. The

OPA861 is available in SO-8 and SOT23-6 sur-

face-mount packages.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

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

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, 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.