TI OPA891DR

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

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

• 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)