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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, V
O
= 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
CONNECTION DIAGRAMS
ADA4841-1
TOP VIEW
NC 1 (Not to Scale) 8 POWER DOWN
–IN 2
+IN 3
–V
S
4
7 +V
S
05614-001
6 V
OUT
5 NC
Figure 1. 8-Lead SOIC (R)
ADA4841-1
V
OUT 1
–V
S 2
+IN
3
6
+V
S
POWER DOWN
–IN
05614-099
5
4
Figure 2. 6-Lead SOT-23 (RJ)
ADA4841-2
OUT1
1
–IN1
2
+IN1
3
–V
S 4
TOP VIEW
(Not to Scale)
05614-064
8
7
6
5
+V
S
OUT2
–IN2
+IN2
APPLICATIONS
Low power, low noise signal processing
Battery-powered instrumentation
16-bit PulSAR® ADC drivers
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.
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 registered trademarks are the property of their respective owners.
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
–40
HARMONIC DISTORTION (dBc)
–50
–60
–70
2V p-p THIRD
–80
–90
–100
–110
–120
0.01
2V p-p SECOND
05614-048
V
S
= ±5V
G = +1
0.1
FREQUENCY (MHz)
1
Figure 4. Harmonic Distortion
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.
ADA4841-1/ADA4841-2
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Connection Diagrams...................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
Maximum Power Dissipation ..................................................... 6
ESD Caution.................................................................................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 13
Amplifier Description................................................................ 13
DC Errors .................................................................................... 13
Noise Considerations ................................................................. 13
Headroom Considerations........................................................ 14
Capacitance Drive ...................................................................... 15
Input Protection ......................................................................... 15
Power-Down Operation ............................................................ 16
Applications Information .............................................................. 17
Typical Performance Values...................................................... 17
16-Bit ADC Driver..................................................................... 17
Reconstruction Filter ................................................................. 17
Layout Considerations............................................................... 18
Ground Plane.............................................................................. 18
Power Supply Bypassing ............................................................ 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 20
REVISION HISTORY
12/10—Rev. D to Rev. E
Changes to Negative Power Supply Rejection Ration Conditions ..3
Changes to Ordering Guide .......................................................... 20
1/10—Rev. C to Rev. D
Added LFCSP Package.......................................................Universal
Changes to Operating Temperature Range Parameter, Table 4.. 6
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 20
3/06—Rev. B to Rev. C
Added SOT-23 Package .....................................................Universal
Changes to General Description .................................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Changes to Table 3............................................................................ 5
Changes to Input Protection Section ........................................... 15
Changes to Ordering Guide .......................................................... 20
10/05—Rev. A to Rev. B
Added ADA4841-2.............................................................Universal
Changes to General Description and Features ............................. 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Changes to Table 3............................................................................ 5
Changes to Table 4, Table 5, and Figure 4 ..................................... 6
Changes to Figure 6...........................................................................7
Changes to Figure 12, Figure 13, Figure 15, and Figure 16..........8
Deleted Figure 25; Renumber Sequentially ................................ 10
Changes to Figure 24 and Figure 28............................................. 10
Changes to Figure 31...................................................................... 11
Inserted Figure 37; Renumber Sequentially................................ 12
Changes to Amplifier Description Section and Figure 39 ........ 13
Changed DC Performance Considerations Section
to DC Errors Section...................................................................... 13
Changes to Noise Considerations Section .................................. 14
Changes to Headroom Considerations Section and Figure 39 15
Changes to Power-Down Operation Section.............................. 16
Changes to 16-Bit ADC Driver Section,
Figure 48, and Figure 49 ................................................................ 17
Changes to Power Supply Bypassing Section ............................. 18
Updated Outline Dimensions....................................................... 19
Changes to Ordering Guide .......................................................... 20
9/05—Rev. 0 to Rev. A
Changes to Features ..........................................................................1
Changes to Figure 2...........................................................................1
Changes to Figure 12.........................................................................8
Changes to Figure 40...................................................................... 14
Changes to Headroom Considerations Section ......................... 15
7/05—Revision 0: Initial Version
Rev. E | Page 2 of 20
ADA4841-1/ADA4841-2
SPECIFICATIONS
T
A
= 25°C, V
S
= ±5 V, R
L
= 1 kΩ, Gain = +1, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion HD2/HD3
Input Voltage Noise
Input Current Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance, Common Mode
Input Resistance, Differential Mode
Input Capacitance, Common Mode
Input Capacitance, Differential Mode
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio (CMRR)
MATCHING CHARACTERISTICS (ADA4841-2)
Input Offset Voltage
Input Bias Current
POWER DOWN PIN (ADA4841-1)
POWER DOWN Voltage
POWER DOWN Voltage
Input Current
Enable
Power Down
Switching Speed
Enable
Power Down
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Current Limit
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current/Amplifier
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Conditions
V
O
= 0.02 V p-p
V
O
= 2 V p-p
G = +1, V
O
= 9 V step, R
L
= 1 kΩ
G = +1, V
O
= 8 V step
G = +1, V
O
= 8 V step
f
C
= 100 kHz, V
O
= 2 V p-p, G = +1
f
C
= 1 MHz, V
O
= 2 V p-p
f = 100 kHz
f = 100 kHz
Min
58
12
Typ
80
3
13
650
1000
−111/−105
−80/−67
2.1
1.4
40
1
3
0.1
120
90
25
1
3
V
CM
= Δ 4 V
−5.1
95
+4
115
70
60
Enabled
Power down
POWER DOWN = +5 V
POWER DOWN = −5 V
>3.6
<3.2
1
−13
1
40
G > +1
Sourcing, V
IN
= +V
S
, R
L
= 50 Ω to GND
Sinking, V
IN
= −V
S
, R
L
= 50 Ω to GND
30% overshoot
±4.9
±4.955
30
60
15
12
1.5
90
2
−30
300
5.3
0.5
Max
Unit
MHz
MHz
V/μs
ns
ns
dBc
dBc
nV/√Hz
pA/√Hz
μV
μV/°C
μA
μA
dB
MΩ
kΩ
pF
pF
V
dB
μV
nA
V
V
μA
μA
μs
μs
V
mA
mA
pF
V
mA
μA
dB
dB
V
O
= ±4 V
103
2.7
POWER DOWN = +5 V
POWER DOWN = −5 V
+V
S
= +5 V to +6 V, −V
S
= −5 V
+V
S
= +5 V, −V
S
= −5 V to −6 V
1.2
40
110
120
95
96
Rev. E | Page 3 of 20
ADA4841-1/ADA4841-2
T
A
= 25°C, V
S
= 5 V, R
L
= 1 kΩ, Gain = +1, V
CM
= 2.5 V, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion HD2/HD3
Input Voltage Noise
Input Current Noise
Crosstalk
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance, Common Mode
Input Resistance, Differential Mode
Input Capacitance, Common Mode
Input Capacitance, Differential Mode
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio (CMRR)
MATCHING CHARACTERISTICS (ADA4841-2)
Input Offset Voltage
Input Bias Current
POWER DOWN PIN (ADA4841-1)
POWER DOWN Voltage
POWER DOWN Voltage
Input Current
Enable
Power Down
Switching Speed
Enable
Power Down
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Current Limit
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current/Amplifier
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Conditions
V
O
= 0.02 V p-p
V
O
= 2 V p-p
G = +1, V
O
= 4 V step, R
L
= 1 kΩ
G = +1, V
O
= 2 V step
G = +1, V
O
= 2 V step
f
C
= 100 kHz, V
O
= 2 V p-p
f
C
= 1 MHz, V
O
= 2 V p-p
f = 100 kHz
f = 100 kHz
f = 100 kHz
Min
54
10
Typ
80
3
12
175
550
−109/−105
−78/−66
2.1
1.4
−117
40
1
3
0.1
124
90
25
1
3
V
CM
= Δ 1.5 V
−0.1
88
+4
115
70
70
Enabled
Power down
POWER DOWN = 5 V
POWER DOWN = 0 V
>3.6
<3.2
1
−13
1
40
G > +1
Sourcing, V
IN
= +V
S
, R
L
= 50 Ω to V
CM
Sinking, V
IN
= −V
S
, R
L
= 50 Ω to V
CM
30% overshoot
0.08 to 4.92
0.029 to 4.974
30
60
15
12
1.4
70
2
−30
300
5.3
0.4
Max
Unit
MHz
MHz
V/μs
ns
ns
dBc
dBc
nV/√Hz
pA/√Hz
dB
μV
μV/°C
μA
μA
dB
MΩ
kΩ
pF
pF
V
dB
μV
nA
V
O
= 0.5 V to 4.5 V
103
V
μA
μA
μs
μs
V
mA
mA
pF
V
mA
μA
dB
dB
2.7
POWER DOWN = 5 V
POWER DOWN = 0 V
+V
S
= +5 V to +6 V, −V
S
= 0 V
+V
S
= +5 V, −V
S
= 0 V to −1 V
1.1
35
110
120
95
96
Rev. E | Page 4 of 20
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