Low Power, Low Noise and Distortion,
Rail-to-Rail Output Amplifiers
ADA4841-1/ADA4841-2
CONNECTION DIAGRAMS
FEATURES
Low power: 1.1 mA/amp
Low wideband noise
2.1 nV/√Hz
1.4 pA/√Hz
Low 1/f noise
ADA4841-1
TOP VIEW
(Not to Scale)
NC
–IN
+IN
1
2
3
4
8
7
6
5
POWER DOWN
+V
S
V
OUT
–V
NC
S
7 nV/√Hz @ 10 Hz
13 pA/√Hz @ 10 Hz
Figure 1. 8-Lead SOIC (R)
ADA4841-1
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
V
1
2
3
6
5
4
+V
S
OUT
–V
POWER DOWN
–IN
S
+IN
Figure 2. 6-Lead SOT-23 (RJ)
Power down
ADA4841-2
Wide supply range: 2.7 V to 12 V
OUT1
–IN1
+IN1
1
2
3
4
8
7
6
5
+V
S
OUT2
–IN2
+IN2
APPLICATIONS
–V
S
Low power, low noise signal processing
Battery-powered instrumentation
16-bit PulSAR® ADC drivers
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 packages feature RoHS compliant
lead finishes. The amplifiers are rated to work over the
industrial temperature range (−40°C to +125°C).
–30
V
= ±5V
S
G = +1
–40
–50
–60
–70
2V p-p THIRD
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.
–80
–90
2V p-p SECOND
–100
–110
–120
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.
0.01
0.1
FREQUENCY (MHz)
1
Figure 4. Harmonic Distortion
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2005–2010 Analog Devices, Inc. All rights reserved.
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