Low Power, Low Noise and Distortion,
Rail-to-Rail Output Amplifier
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)
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
ADA4841-2
OUT1
–IN1
+IN1
1
2
3
4
8
7
6
5
+V
S
OUT2
–IN2
+IN2
–V
S
TOP VIEW
(Not to Scale)
Figure 2. 8-Lead MSOP (RM-8) and 8-Lead SOIC_N (R)
Power down
ADA4841-1
Wide supply range: 2.7 V to 12 V
V
1
2
3
6
5
4
+V
S
OUT
APPLICATIONS
–V
POWER DOWN
–IN
S
Low power, low noise signal processing
Battery-powered instrumentation
16-bit PulSAR® ADC drivers
+IN
Figure 3. 6-Lead SOT-23 (RJ)
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. Despite 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 Pb-free lead
finish. 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. C
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