OP285*

Features:

Low Offset Voltage: 250 V
Low Noise: 6 nV/ Hz
Low Distortion: 0.0006%
High Slew Rate: 22 V/s
Wide Bandwidth: 9 MHz
Low Supply Current: 5 mA
Low Offset Current: 2 nA
Unity-Gain Stable
SO-8 Package


Application

High Performance Audio
Active Filters
Fast Amplifiers
Integrators


Pinout




Specifications

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±22 V
Input Voltage² . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Differential Input Voltage² . . . . . . . . . . . . . . . . . . . . ±7.5 V
Output Short-Circuit Duration to Gnd3 . . . . . . . . .Indefinite
Storage Temperature Range
P, S Package . . . . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Operating Temperature Range
OP285G . . . . . . . . . . . . . . . . . . . . . . . . . . .40°C to +85°C
Junction Temperature Range
P, S Package . . . . . . . . . . . . . . . . . . . . . .65°C to +150°C
Lead Temperature Range (Soldering 60 Sec) . . . . . .300°C


Description

The OP285 is a precision high-speed amplifier featuring the Butler Amplifier front-end. This new front-end design com-bines the accuracy and low noise performance of bipolar transistors with the speed of JFETs. This yields an amplifier
with high slew rates, low offset and good noise performance at low supply currents. Bias currents are also low com-pared to bipolar designs.

The OP285 offers the slew rate and low power of a JFET amplifier combined with the precision, low noise and lowdrift of a bipolar amplifier. Input offset voltage is laser-trimmed and guaranteed less than 250 µV. This makes the OP285 useful in dc-coupled or summing applications without the need for special selections or the added noise of additional offset adjustment circuitry. Slew rates of 22 V/µs and a bandwidth of 9 MHz make the OP285 one of the most acc-urate medium speed amplifiers available.

The combination of low noise, speed and accuracy can be used to build high speed instrumentation systems. Circuits such as instrumentation amplifiers, ramp generators, bi-quad filters and dc-coupled audio systems are all practical with the OP285. For applications that require long term stability, the OP285 has a guaranteed maximum long term drift specification.

The OP285 is specified over the XIND-extended industrial-(40°C to +85°C) temperature range. OP285s are avai-lable in 8-pin plastic DIP and SOIC-8 surface mount packages.