ADA4841-2_15 Datasheet, PDF (1/20 Pages) Analog Devices – Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifiers

Data Sheet
Low Power, Low Noise and Distortion,
Rail-to-Rail Output Amplifiers
ADA4841-1/ADA4841-2
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
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
APPLICATIONS
Low power, low noise signal processing
Battery-powered instrumentation
16-bit PulSAR® ADC drivers
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.
Rev. F
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CONNECTION DIAGRAMS
ADA4841-1
TOP VIEW
NC 1 _{(Not to Scale)} 8 _{POWER DOWN}
–IN 2
7 ^+VS
+IN 3
6 VOUT
–V_S 4
5 NC
Figure 1. 8-Lead SOIC (R)
ADA4841-1
V_OUT 1
6 +V_S
–V_S 2
5 POWER DOWN
+IN 3
4 –IN
Figure 2. 6-Lead SOT-23 (RJ)
ADA4841-2
OUT1 1
–IN1 2
+IN1 3
–V_S 4
8 +V_S
7 OUT2
6 –IN2
5 +IN2
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)
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_S = ±5V
–40 G = +1
–50
–60
–70
2V p-p THIRD
–80
–90
–100
2V p-p SECOND
–110
–120
0.01
0.1
1
FREQUENCY (MHz)
Figure 4. Harmonic Distortion
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