OPA891DGNR

Instrumentation, Op Amps, Buffer Amps Overview

The OPA891DGNR is a single-channel, high-speed voltage feedback operational amplifier from Texas Instruments. It features a unity-gain bandwidth of 180 MHz and a slew rate of 105 V/µs. The device exhibits ultra-low input voltage noise density of 0.95 nV/√Hz and low total harmonic distortion of -100 dBc at 1 MHz with a 1 kΩ load. It provides a typical output current drive of 200 mA while consuming only 7.5 mA of supply current per channel. The unit operates within a dual-supply range of ±4.5 V to ±18 V or a single supply of 9 V to 36 V. It is housed in an 8-pin HVSSOP package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Ultra-low voltage noise density of 0.95 nV/√Hz for high-fidelity signal processing
• High-speed performance with 180 MHz unity-gain bandwidth and 105 V/µs slew rate
• Very low total harmonic distortion reaching -100 dBc at 1 MHz
• Integrated offset nulling pins for precise DC accuracy adjustment

Instrumentation, Op Amps, Buffer Amps Applications

• Low-noise, wide-band amplifiers for industrial applications
• Professional audio mixers, control surfaces, and instrument amplifiers
• Ultrasound scanners and vector signal transceivers (VST)
• Video amplifiers and cable drivers
• Active filters and data acquisition systems

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific DGN suffix indicates the 8-pin HVSSOP package configuration. Confirm that the ordering part number matches the required single-channel variant. Ensure compatibility with standard surface-mount assembly processes for the specified package dimensions. Check for moisture sensitivity level requirements during storage and handling.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when both high bandwidth and ultra-low voltage noise are critical requirements. The inclusion of offset nulling pins distinguishes it from similar amplifiers lacking manual calibration capabilities. Consider the 200 mA output drive capability if driving low-impedance loads such as cables or specific transducers without external buffering stages.

Instrumentation, Op Amps, Buffer Amps Part Context

The OPA891 belongs to the OPAx891 family of ultra-low noise, high-speed operational amplifiers manufactured by Texas Instruments. This family includes the dual-channel OPA2891 variant. These devices utilize a complementary bipolar process designed to deliver exceptional AC performance, making them suitable for demanding communications and imaging applications requiring minimal signal degradation.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The OPA2891 serves as a dual-channel alternative within the same family. Verify pinout compatibility and thermal characteristics when substituting packages.