OPA860 Datasheet, PDF (1/29 Pages) Burr-Brown (TI) – Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER

BurrĆBrown Products
from Texas Instruments
OPA860
Wide Bandwidth
OPERATIONAL TRANSCONDUCTANCE
AMPLIFIER (OTA) and BUFFER
SBOS331 – JUNE 2005
OTA FEATURES
• Wide Bandwidth (80MHz, Open-Loop, G = +5)
• High Slew Rate (900V/µs)
• High Transconductance (95mA/V)
• External I_Q-Control
BUFFER FEATURES
• Closed-Loop Buffer
• Wide Bandwidth (1600MHz, V_O = 1V_PP)
• 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 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
OPA860 is available in an SO-8 surface-mount pack-
age.
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated