1 Features

1• 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: 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

2 Applications

• Ultrasound scanner

• Semiconductor test

• X-ray systems

• Lab and field instrumentation

• Data acquisition (DAQ)

• Radar

• Wireless communications test

• Seismic data acquisition

• DC power supply, ac source, electronic load

• Power analyzer

• Source measurement unit (SMU)

3 Description

The OPAx211 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 OPAx211

series make these devices an excellent choice as a

loop filter amplifier in PLL applications.

In precision data acquisition applications, the

OPAx211 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 OPAx211 series a great

choice for driving high-precision 16-bit analog-todigital

converters (ADCs) or buffering the output of

high-resolution digital-to-analog converters (DACs).

The OPAx211 series is specified over a wide dualpower

supply range of ±2.25 to ±18 V, or for singlesupply

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. The dual

version OPA2211 is available in a SON-8 (3 mm × 3

mm) or an SO-8 PowerPAD™ package. This series

of operational amplifiers is specified from TA = –40°C

to +125°C.