1OTA FEATURES

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

· High Slew Rate (900V/μs)

· High Transconductance (95mA/V)

· External IQ-Control

BUFFER FEATURES

· Closed-Loop Buffer

· Wide Bandwidth (1600MHz, VO = 1VPP)

· High Slew Rate (4000V/μs)

· 60mA Output Current

OPA860 FEATURES

· Low Quiescent Current (11.2mA)

· Versatile Circuit Function

APPLICATIONS

· Baseline Restore Circuits

· Video/Broadcast Equipment

· Communications Equipment

· High-Speed Data Acquisition

· Wideband LED Driver

· AGC-Multiplier

· ns-Pulse Integrator

· Control Loop Amplifier

· OPA660 Upgrade

DESCRIPTION

The OPA860 is a versatile monolithic component

designed for wide-bandwidth systems, including high

performance video, RF and IF circuitry. It includes a wideband, bipolar operational transconductance

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

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

output (collector). The OTA, 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 OTA can be adjusted with an external resistor,

allowing bandwidth, quiescent current, and gain

trade-offs to be optimized.

Also included in the OPA860 is an uncommited

closed-loop, unity-gain buffer. This provides

1600MHz bandwidth and 4000V/μs slew rate.

Used as a basic building block, the OPA860

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 OPA860 is available in an SO-8 surface-mount

package.