(ACTIVE) 1.1 nV/√Hz Noise, Low Power, Precision Operational Amplifier


Functional diagram


The OPA2211-EP series of precision operational amplifiers achieves very-low 1.1-nV/√Hz noise density with a supply current of only 3.6 mA. This series also offers rail-to-rail output swing, which maximizes dynamic range.

The extremely low voltage and low current noise, high speed, and wide output swing of the OPA2211-EP series make these devices an excellent choice as a loop filter amplifier in PLL applications.

In precision data acquisition applications, the OPA2211-EP series of operational amplifiers provides 700-ns settling time to 16-bit accuracy throughout 10-V output swings. This AC performance, combined with only 125 µV of offset and 0.35 µV/°C of drift over temperature, makes the OPA2211-EP ideal for driving high-precision 16-bit analog-to-digital converters (ADCs) or buffering the output of high-resolution digital-to-analog converters (DACs).

The OPA2211-EP is specified over a wide dual-power supply range of ±2.25 V to ±18 V, or for single-supply operation from 4.5 to 36 V.

The OPA2211-EP is available in a small DFN-8 (3-mm × 3-mm) package. These operational amplifiers are specified from TJ = -55°C to 125°C.


  • Low Voltage Noise: 1.1 nV/√Hz at 1 kHz
  • Input Voltage Noise: 80 nVPP (0.1 to 10 Hz)
  • THD+N: -136 dB (G = 1, ƒ = 1 kHz)
  • Offset Voltage: 180 µV (Max)
  • Offset Voltage Drift: 0.35 µV/°C (Typ)
  • Low Supply Current: 3.6 mA/Ch (Typ)
  • Unity-Gain Stable
  • Gain Bandwidth Product:
    80 MHz (G = 100)
    45 MHz (G = 1)
  • Slew Rate: 27 V/µs
  • 16-Bit Settling: 700 ns
  • Wide Supply Range:
    ±2.25 V to ±18 V, +4.5 V to +36 V
  • Rail-to-Rail Output
  • Output Current: 30 mA
  • Supports Defense, Aerospace, and Medical Applications
    • Controlled Baseline
    • One Assembly and Test Site
    • One Fabrication Site
    • Available in Military (-55°C to 125°C) Temperature Range(1)
    • Extended Product Life Cycle
    • Extended Product-Change Notification
    • Product Traceability


  • PLL Loop Filter
  • Low-Noise, Low-Power Signal Processing
  • 16-Bit ADC Drivers
  • DAC Output Amplifiers
  • Active Filters
  • Low-Noise Instrumentation Amplifiers
  • Ultrasound Amplifiers
  • Professional Audio Preamplifiers
  • Low-Noise Frequency Synthesizers
  • Infrared Detector Amplifiers
  • Hydrophone Amplifiers
  • Geophone Amplifiers
  • Medical

(1)Additional temperature ranges available - contact factory
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Number of Channels (#) 2   
Total Supply Voltage (Min) (+5V=5, +/-5V=10) 4.5   
Total Supply Voltage (Max) (+5V=5, +/-5V=10) 36   
GBW (Typ) (MHz) 45   
Slew Rate (Typ) (V/us) 27   
Rail-to-Rail Out   
Vos (Offset Voltage @ 25C) (Max) (mV) 0.175   
Iq per channel (Typ) (mA) 3.6   
Rating HiRel Enhanced Product   
Operating Temperature Range (C) -55 to 125   
Package Group SON   
Output Current (Typ) (mA) 30   
Offset Drift (Typ) (uV/C) 0.35   
Vn at 1kHz (Typ) (nV/rtHz) 1.1   
Architecture Bipolar   
IIB (Max) (pA) 215000   
CMRR (Typ) (dB) 120   
Package Size: mm2:W x L (PKG) See datasheet (SON)   

Companion Products

Technical Documents

Datasheet (1)

Application notes (3)

Selection guides (1)

Solution guides (2)

Radiation & Reliability reports (1)

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