Low Noise and Distortion,

Rail-to-Rail Output Amplifier

Known Good Die

ADA4841-2KGD

Rev. A

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

©2015–2017 Analog Devices, Inc. All rights reserved.

Technical Support

www.analog.com

FEATURES

Low power: 1.1 mA/amplifier

Low wideband noise

2.1 nV/√Hz input voltage noise

1.4 pA/√Hz input current noise

Low 1/f noise

7 nV/√Hz at 10 Hz

13 pA/√Hz at 10 Hz

Low distortion: −105 dBc at 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

Wide supply range: 2.7 V to 12 V

Known good die (KGD): these die are fully guaranteed to

data sheet specifications

APPLICATIONS

Low power, low noise signal processing

Battery-powered instrumentation

16-bit PulSAR® ADC drivers

FUNCTIONAL BLOCK DIAGRAM

OUT1

–IN1

+IN1

–VS

+VS

OUT2

–IN2

+IN2

ADA4841-2KGD

Figure 1.

GENERAL DESCRIPTION

The ADA4841-2KGD is a unity-gain stable, low noise and

distortion, rail-to-rail output amplifier that has a quiescent current

of 1.5 mA maximum. Its low power consumption notwithstanding,

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 ADA4841-2KGD output can swing to less than 50 mV of

either rail. The input common-mode voltage range extends

down to the negative supply. The ADA4841-2KGD can drive up

to 10 pF of capacitive load with minimal peaking.

The ADA4841-2KGD provides the performance required to

efficiently support emerging 16-bit to 18-bit analog-to-digital

converters (ADCs) and is ideal for portable instrumentation,

high channel count, industrial measurement, and medical

applications. The ADA4841-2KGD is ideally suited to drive the

AD7685/AD7686, 16-bit PulSAR ADCs.

Additional application and technical information can be found

in the ADA4841-2 data sheet.

–30

–120

0.01

1

FREQUENCY (MHz)

0.1

2V p-p THIRD

–40

–50

–60

–70

–80

–90

–100

–110

VS = ±5V

G = +1

2V p-p SECOND

Figure 2. Harmonic Distortion vs. Frequency