Product
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OPA2891
  • OPA2891
  • OPA2891
  • OPA2891
  • OPA2891
  • OPA2891

OPA2891

ACTIVE

Dual-channel 180MHz 0.95nV√Hz operational amplifier with ultra-low total harmonic distortion (THD)

Texas Instruments OPA2891 Product Info

1 April 2026 6

Parameters

Architecture

Voltage FB

Number of channels

2

Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V)

9

Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V)

36

GBW (typ) (MHz)

180

BW at Acl (MHz)

180

Acl, min spec gain (V/V)

1

Slew rate (typ) (V/µs)

105

Vn at flatband (typ) (nV√Hz)

0.95

Vn at 1 kHz (typ) (nV√Hz)

1

Iq per channel (typ) (mA)

7.5

Vos (offset voltage at 25°C) (max) (mV)

1

Rail-to-rail

No

Rating

Catalog

Operating temperature range (°C)

-40 to 85

CMRR (typ) (dB)

106

Input bias current (max) (pA)

20000000

Offset drift (typ) (µV/°C)

1

Iout (typ) (mA)

200

2nd harmonic (dBc)

91

3rd harmonic (dBc)

91

Frequency of harmonic distortion measurement (MHz)

1

Package

HVSSOP (DGN)-8-14.7 mm² 3 x 4.9

Features

  • Ultra-low 0.95nV/√Hz voltage noise
  • High speed:
    • 180MHz unity gain bandwidth
    • 140MHz bandwidth at a gain of 2V/V (–1V/V)
    • 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 0.2mV (typical) and 1mV (maximum) input offset voltage at 25°C
  • 200mA output current drive (typical)
  • Typical operation from ±4.5V to ±18V
  • Offset nulling pins on the OPA891
  • Ultra-low 0.95nV/√Hz voltage noise
  • High speed:
    • 180MHz unity gain bandwidth
    • 140MHz bandwidth at a gain of 2V/V (–1V/V)
    • 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 0.2mV (typical) and 1mV (maximum) input offset voltage at 25°C
  • 200mA output current drive (typical)
  • Typical operation from ±4.5V to ±18V
  • Offset nulling pins on the OPA891

Description

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 140MHz bandwidth, gain (G) = 2V/V, 105V/µs slew rate, and 70ns settling time (0.1%). The OPAx891 are unity-gain stable with 180MHz bandwidth. These amplifiers have a high drive capability of 200mA and draw only 7.5mA supply current per channel. With –100dBc of total harmonic distortion (THD) at f = 1MHz and a very low noise of 0.95nV/√Hz, the OPAx891 are designed for applications requiring low distortion and low noise such as buffering analog-to-digital converters.

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