Low Power, Low Noise and Distortion,

Rail-to-Rail Output Amplifiers

Data Sheet

ADA4841-1/ADA4841-2

Rev. G

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FEATURES

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

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

APPLICATIONS

Low power, low noise signal processing

Battery-powered instrumentation

16-bit PulSAR® ADC drivers

CONNECTION DIAGRAMS

3

4

6

5

2

7

1

8

–IN

+IN

NC

NC

POWER DOWN

ADA4841-1

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC (R)

+IN

3

6

POWER DOWN

5

–IN

4

ADA4841-1

Figure 2. 6-Lead SOT-23 (RJ)

OUT1

1

2

+IN1

3

8

OUT2

7

6

+IN2

5

ADA4841-2

TOP VIEW

(Not to Scale)

NOTES

1. FOR 8-LEAD LFCSP_WD, CONNECT

EXPOSED PADDLE TO GND.

Figure 3. 8-Lead MSOP (RM), 8-Lead SOIC_N (R), and 8-Lead LFCSP_WD (CP)

GENERAL DESCRIPTION

The ADA4841-1/ADA4841-2 are unity gain stable, low noise

and distortion, rail-to-rail output amplifiers that have a quiescent

current of 1.5 mA maximum. In spite of their low power

consumption, these amplifiers offer 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 amplifiers have low 1/f noise of 7 nV/√Hz

and 13 pA/√Hz at 10 Hz.

The ADA4841-1/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 ADA4841-1/

ADA4841-2 can drive up to 10 pF of capacitive load with

minimal peaking.

The ADA4841-1/ADA4841-2 provide the performance required

to efficiently support emerging 16-bit to 18-bit ADCs and are

ideal for portable instrumentation, high channel count, industrial

measurement, and medical applications. The ADA4841-1/

ADA4841-2 are ideally suited to drive the AD7685/AD7686,

16-bit PulSAR ADCs.

The ADA4841-1/ADA4841-2 packages feature RoHS compliant

lead finishes. The amplifiers are rated to work over the

industrial temperature range (−40°C to +125°C).

–30

–120

0.01

1

FREQUENCY (MHz)

0.1

2V p-p THIRD

–40

–50

–60

–70

–80

–90

–100

–110

G = +1

2V p-p SECOND

Figure 4. Harmonic Distortion