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.