OPA211 - 1.1nV/rtHz Noise, Low-Power, Precision Operational Amplifier

The OPAx211 series of precision operational amplifiers achieves very low1.1-nV/√Hz noise density with a supply current of only 3.6 mA. This seriesalso 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 theOPAx211 series make these devices an excellent choice as a loop filter amplifier in PLLapplications.

In precision data acquisition applications, the OPAx211 series of operational amplifiersprovides 700-ns settling time to 16-bit accuracy throughout 10-V output swings. This acperformance, combined with only 125 µV of offset and 0.35 µV/°C of drift over temperature, makesthe OPAx211 series suitable for driving high-precision 16-bit analog-to-digital converters (ADCs)or buffering the output of high-resolution digital-to-analog converters (DACs).

The OPAx211 series is specified over a wide dual-power supply range of ±2.25 to ±18 V, orfor single-supply operation from 4.5 to 36 V.

The OPA211 is available in the small SON-8 (3 mm × 3 mm), VSSOP-8, and SOIC-8 packages. Adual version (OPA2211) is available in a SON-8 (3 mm × 3 mm) or an SO-8PowerPAD™ package. This series of operationalamplifiers is specified from T_A = –40°C to +125°C.

• Low Voltage Noise: 1.1 nV/√Hz at 1 kHz
• Input Voltage Noise: 80 nV_PP (0.1 to 10 Hz)
• THD + N: –136 dB (G = 1, ƒ = 1 kHz)
• Offset Voltage: 125 µV (Maximum)
• Offset Voltage Drift: 0.35 µV/°C (Typical)
• Low Supply Current: 3.6 mA/Ch (Typical)
• 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 to ±18 V, 4.5 V to 36 V
• Rail-to-Rail Output
• Output Current: 30 mA
• SON-8 (3 mm × 3 mm), VSSOP-8, and SOIC-8

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