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Texas Instruments OPAx891 High-Speed Operational Amplifiers

Texas Instruments OPAx891 High-Speed Operational Amplifiers are ultra-low voltage noise, high-speed voltage feedback amplifiers. These op amps are an excellent choice for applications requiring low-voltage noise, including communications and imaging. The single-amplifier OPA891 and the dual-amplifier OPA2891 offer excellent AC performance with 140MHz bandwidth (G = 2), 105V/µs slew rate and 70ns settling time (0.1%). The OPAx891 are unity-gain stable with 180MHz bandwidth. The Texas Instruments OPAx891 amplifiers draw only 7.5mA supply current per channel and have a high drive capability of 200mA. With –100dBc of total harmonic distortion (THD) at f = 1MHz and very low noise of 0.95nV/√Hz, the OPAx891 are designed for applications requiring low noise and distortion, such as buffering analog-to-digital converters.

Features

  • Ultra-low 0.95nV/√Hz voltage noise
  • High Speed
    • 180MHz unity gain bandwidth
    • 140MHz bandwidth [G = 2 (–1), –3dB]
    • 105V/µs slew rate
  • Very low distortion
    • THD = –91dBc (f = 1MHz, RL = 150Ω)
    • THD = –100dBc (f = 1MHz, RL = 1kΩ)
    • THD+N = =137dBc (f = 1kHz, BW = 80kHz)
  • Low 0.2-mV (typical) and 1mV (max) input offset voltage at 25°C
  • 200mA output current drive (typical)
  • Typical operation from ±4.5V to ±18V
  • Offset nulling pins on the OPA891

Applications

  • Low-noise, wide-band amplifier for industrial applications
  • Voltage-controlled oscillators
  • Active filters
  • Video amplifiers
  • Cable drivers
  • Ultrasound Scanners
  • Vector signal transceiver (VST)
  • Professional audio mixer or control surface
  • Professional microphones and wireless systems
  • Professional speaker systems
  • Professional audio amplifier
  • Soundbar
  • Turntable
  • Professional video camera
  • Guitar and other instrument amplifier
  • Data acquisition (DAQ)

Functional Block Diagrams

Texas Instruments OPAx891 High-Speed Operational Amplifiers

Texas Instruments OPAx891 High-Speed Operational Amplifiers