OPA860

宽带运算跨导放大器和缓冲器

The 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.

.

OTA FEATURES

.

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

.

APPLICA ONS

.

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

All other trademarks are the property of their respective owners.