OP275:  Dual Bipolar/JFET, Audio Operational Amplifier

The OP275 is the first amplifier to feature the Butler Amplifier front-end. This new front-end design combines both bipolar and JFET transistors to attain amplifiers with the accuracy and low ...More

OP275:  Dual Bipolar/JFET, Audio Operational Amplifier

Product Description

The OP275 is the first amplifier to feature the Butler Amplifier front-end. This new front-end design combines both bipolar and JFET transistors to attain amplifiers with the accuracy and low noise performance of bipolar transistors, and the speed and sound quality of JFET's. Total Harmonic Distortion plus Noise equals that of previous audio amplifiers, but at much lower supply currents.

A very low l/f corner of below 6 Hz maintains a flat noise density response. Whether noise is measured at either 30 Hz or 1kHz, it is only 6 nV/(root)Hz. The JFET portion of the input stage gives the OP275 its high slew rates to keep distortion low, even when large output swings are required, and the 22 V/µs slew rate of the OP275 is the fastest of any standard audio amplifier. Best of all, this low noise and high speed are accomplished using less than 5mA of supply current, lower than any standard audio amplifier.

Improved dc performance is also provided with bias and offset currents greatly reduced over purely bipolar designs. Input offset voltage is guaranteed at 1mV and is typically less than 200µV. This allows the OP275 to be used in many dc coupled or summing applications without the need for special selections or the added noise of additional offset adjustment circuitry.

The output os capable of driving 600 Ohm loads to 10 V rms while maintaining low distortion. THD + Noise at 3 V rms is a low 0.0006%.

The OP275 is specified over the extended industrial (-40°C to +85°C) temperature range. OP275s are availale in both plastic DIP and SOIC-8 packages. SOIC-8 packages are available in 2500 piece reels. Many audio amplifiers are not offered in SOIC-8 surface mount packages for a variety of reasons; however, the OP275 was designed so that it would offer full performance in surface mount packaging.

Features

  • Excellent Sonic Characteristics
  • Low Noise: 6 nV/√Hz
  • Low Distortion: 0.0006%
  • High Slew Rate: 22 V/µs
  • Wide Bandwidth: 9 MHz
  • Low Supply Current: 5 mA
  • Low Offset Voltage: 1 mV
  • Low Offset Current: 2 nA
  • Unity Gain Stable
  • SOIC-8 Package
  • PDIP-8 Package

Diagrams

OP275 Diagram
Pin Configuration Diagram for OP275

Specifications

-3dB Bandwidth 9MHz
Slew Rate 22V/µs
Vos 1mV
Ib 100nA
Input Noise (nV/rtHz) 6nV/rtHz
Vcc-Vee Supply (V) 9 to 44
Iq per Amplifier 2.5mA
# OpAmps per Pkg 2
Operating Temp Range -40 to +85
Packages DIP,SOIC

Explore Other Products

Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
OP285 9MHz 22V/µs 35µV 100nA 6nV/rtHz 2 -40 to +85
OP275 9MHz 22V/µs 1mV 100nA 6nV/rtHz 2 -40 to +85
AD8620 25MHz 50V/µs 85µV 2pA 6nV/rtHz 2 -40 to +125
AD8652 50MHz 41V/µs 100µV 1pA 5nV/rtHz 2 -40 to +125
AD823 16MHz 25V/µs 700µV 5pA 16nV/rtHz 2 -40 to +85
AD8397 69MHz 53V/µs 1mV 200nA 4.5nV/rtHz 2 -40 to +85
AD8034 80MHz 80V/µs 1mV 1.5pA 11nV/rtHz 2 -40 to +85
AD8018 130MHz 300V/µs 1mV 1µA 4.5nV/rtHz 2 -40 to +85
AD8066 145MHz 180V/µs 400µV 2pA 7nV/rtHz 2 -40 to +85
AD8012 350MHz 2.25KV/µs 1mV 3µA 2.5nV/rtHz 2 -40 to +85
AD8016 380MHz 1KV/µs 1mV 45µA 2.6nV/rtHz 2 -40 to +85
Pricing, Packaging & Availability

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  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
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  • Automotive: -40 to +125 degrees Celsius
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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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