ADA4841-2

Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier

* Low power: 1.1 mA/amp

* Low wideband noise

* 2.1 nV/√Hz

* 1.4 pA/√Hz

* Low 1/f noise

* 7 nV/√Hz @ 10 Hz

* 13 pA/√Hz @ 10 Hz

* Low distortion: −105 dBc @ 100 kHz, VO = 2 V p-p

* High speed

* 80 MHz, −3 dB bandwidth (G = +1)

* 12 V/μs slew rate

* 175 ns settling time to 0.1%

* Low offset voltage: 0.3 mV maximum

* Rail-to-rail output

* Power down

* Wide supply range: 2.7 V to 12 V

The ADA4841-2 is a unity gain stable, low noise and distortion, rail-to-rail output amplifier that has a quiescent current of 1.5 mA maximum. In spite of its low power consumption, this amplifier offers low wideband voltage noise performance of 2.1 nV/√Hz and 1.4 pA/√Hz current noise, along with excellent spurious-free dynamic range (SFDR) of −105 dBc at 100 kHz. To maintain a low noise environment at lower frequencies, the amplifier has low 1/f noise of 7 nV/√Hz and 13 pA/√Hz at 10 Hz. The ADA4841-2 output can swing to less than 50 mV of either rail. The input common-mode voltage range extends down to the negative supply. The ADA4841-2 can drive up to 10 pF of capacitive load with minimal peaking. The ADA4841-2 provides the performance required to efficiently support emerging 16-bit to 18-bit ADCs and is ideal for portable instrumentation, high channel count, industrial measurement, and medical applications. The ADA4841-1 is ideally suited to drive the AD7685/AD7686, 16-bit PulSAR ADCs. The ADA4841-2 package features RoHS compliant lead finishes. The amplifier is rated to work over the industrial temperature range (−40°C to +125°C).

Applications

* Low power, low noise signal processing

* Battery-powered instrumentation

* 16-bit PulSAR® ADC drivers