Data Sheet
FEATURES
Wide Supply Dual, 17 MHz, Rail-to-Rail
FET Input Amplifier
AD823A
CONNECTION DIAGRAM
OUT1
1
–IN1
2
+IN1
3
–V
S 4
8
7
6
5
Single-supply operation
Output swings rail-to-rail
Input voltage range extends below ground
Single-supply capability from 3 V to 36 V
High load drive
Capacitive load drive of 470 pF (G = +1, 25% overshoot)
Linear output current of 40 mA, 0.5 V from supplies
Excellent ac performance on 2.6 mA/amplifier
−3 dB bandwidth of 17 MHz, G = +1
325 ns settling time to 0.01% (2 V step)
Slew rate of 30 V/μs
Low distortion: −108 dBc at 20 kHz (G = −1, R
L
= 2 kΩ)
Good dc performance
700 μV maximum input offset voltage
1 μV/°C offset voltage drift
25 pA maximum input bias current
Low noise: 14 nV/√Hz at 10 kHz
No phase inversion with inputs to the supply rails
+V
S
OUT2
–IN2
+IN2
09439-001
09439-102
AD823A
Figure 1. 8-Lead SOIC
AD823A
OUT1
1
–IN1
2
+IN1
3
–V
S
4
8
7
6
5
+V
S
OUT2
–IN2
+IN2
TOP VIEW
(Not to Scale)
Figure 2. 8-Lead MSOP
V
S
= 3V
C
L
= 50pF
G = +1
3.0V
APPLICATIONS
Photodiode preamps
Active filters
12-bit to 16-bit data acquisition systems
Medical instrumentation
Precision instrumentation
1.5V
0V
09439-049
GENERAL DESCRIPTION
The
AD823A
is a dual precision, 17 MHz, JFET input op amp
manufactured in the extra fast complementary bipolar (XFCB)
process. The
AD823A
can operate from a single supply of 3 V
to 36 V or from dual supplies of ±1.5 V to ±18 V. It has true
single-supply capability with an input voltage range extending
below ground in single-supply mode. Output voltage swing extends
to within 20 mV of each rail for IOUT ≤ 100 μA, providing
outstanding output dynamic range. It also has a linear output
current of 40 mA, 0.5 V from the supply rails.
An offset voltage of 700 μV maximum, an offset voltage drift of
1 μV/°C, and typical input bias currents of 0.3 pA provide dc
precision with source impedances up to 1 GΩ. The
AD823A
provides 17 MHz, −3 dB bandwidth, and a 30 V/μs slew rate with
a low supply current of only 2.6 mA per amplifier. It also provides
low input voltage noise of 14 nV/√Hz and −108 dB SFDR at
20 kHz. The
AD823A
has low input capacitances (0.6 pF differ-
ential and 1.3 pF common mode) and drives more than 500 pF
of direct capacitive load as a follower. This lets the amplifier
handle a wide range of load conditions.
Rev. B
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.
500mV/DIV
200µs/DIV
Figure 3. Output Swing, +V
S
= +3 V, G = +1
This combination of ac and dc performance, plus the outstanding
load drive capability, results in an exceptionally versatile ampli-
fier for applications such as ADC drivers, high speed active filters,
and other low voltage, high dynamic range systems.
The
AD823A
is available over the industrial temperature range
of −40°C to +85°C and is offered in an 8-lead SOIC package and
an 8-lead MSOP package.
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
©2012 Analog Devices, Inc. All rights reserved.
AD823A* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
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AD823A Material Declaration
•
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•
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•
Symbols and Footprints
EVALUATION KITS
•
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Operational Amplifiers
DOCUMENTATION
Data Sheet
•
AD823A: Wide Supply Dual, 17 MHz, Rail-to-Rail FET Input
Amplifier Datasheet
User Guides
•
UG-128: Universal Evaluation Board for Dual High Speed
Op Amps in SOIC Packages
•
UG-886: Universal Evaluation Board for Dual High Speed
Op Amps Offered in 8-Lead MSOP
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TECHNICAL SUPPORT
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•
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•
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AD823A
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Connection Diagram ....................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
5 V Operation ............................................................................... 3
3.3 V Operation ............................................................................ 4
±15 V Operation ........................................................................... 5
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution .................................................................................. 6
Data Sheet
Pin Configuration and Function Descriptions..............................7
Typical Performance Characteristics ..............................................8
Theory of Operation ...................................................................... 14
Output Impedance ..................................................................... 14
Applications Information .............................................................. 15
Input Characteristics .................................................................. 15
Output Characteristics............................................................... 15
Wideband Photodiode Preamp ................................................ 16
Active Filter ................................................................................. 18
Maximizing Performance Through Proper Layout ............... 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
REVISION HISTORY
6/12—Rev. A to Rev. B
Added Text to Absolute Maximum Ratings Section .................... 6
Changes to Equation 8 ................................................................... 18
5/12—Revision A: Initial Version
Rev. B | Page 2 of 20
Data Sheet
SPECIFICATIONS
5 V OPERATION
T
A
= 25°C, +V
S
= 5 V, R
L
= 2 kΩ to 2.5 V, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Full Power Response
Slew Rate
Settling Time
To 0.1%
To 0.01%
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise
Input Current Noise
Harmonic Distortion (SFDR)
Crosstalk
f = 1 kHz
f = 1 MHz
DC PERFORMANCE
Initial Offset
Maximum Offset over Temperature
Offset Drift
Input Bias Current
At T
MAX
Input Offset Current
At T
MAX
Open-Loop Gain
T
MIN
to T
MAX
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range
Input Resistance
Input Capacitance
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
L
= ±100 µA
I
L
= ±2 mA
I
L
= ±10 mA
Linear Output Current
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current
Power Supply Rejection Ratio
Conditions
G = +1, V
OUT
≤ 0.2 V p-p
V
OUT
= 2 V p-p
G = −1, V
OUT
= 4 V step
G = −1, V
OUT
= 2 V step
G = −1, V
OUT
= 2 V step
f = 10 kHz
f = 1 kHz
V
OUT
= 2 V p-p, f = 20 kHz, G = −1, R
F
= R
G
= 4 kΩ
V
OUT
= 2 V p-p, f = 20 kHz, G = +1, R
L
= 1 kΩ
R
L
= 5 kΩ
R
L
= 5 kΩ
Min
14.1
25
Typ
17
4.8
30
240
325
14
1
−108
−99
−123
−77
0.12
0.2
1
0.3
10
0.3
3.5
175
0.7
1.3
25
25
20
Max
AD823A
Unit
MHz
MHz
V/µs
ns
ns
nV/√Hz
fA/√Hz
dBc
dBc
dB
dB
mV
mV
µV/°C
pA
pA
pA
pA
V/mV
V/mV
V
Ω
pF
pF
dB
V
CM
= 0 V to 4 V
V
CM
= 0 V to 4 V
V
OUT
= 0.2 V to 4 V, R
L
= 2 kΩ
40
25
−0.2 to +3
Differential Mode
Common Mode
V
CM
= 0 V to 3 V
60
−0.2 to +3.8
10
13
0.6
1.3
73
V
OUT
= 0.5 V to 4.5 V
Sourcing to 2.5 V
Sinking to 2.5 V
G = +1
3
T
MIN
to T
MAX
, total
V
S
= 5 V to 15 V, T
MIN
to T
MAX
70
0.009 to 4.98
0.026 to 4.96
0.097 to 4.88
40
50
101
500
36
5.7
V
V
V
mA
mA
mA
pF
V
mA
dB
5.1
94
Rev.
B
| Page 3 of 20
AD823A
3.3 V OPERATION
T
A
= 25°C, +V
S
= 3.3 V, R
L
= 2 kΩ to 1.65 V, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Full Power Response
Slew Rate
Settling Time
To 0.1%
To 0.01%
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise
Input Current Noise
Harmonic Distortion (SFDR)
Crosstalk
f = 1 kHz
f = 1 MHz
DC PERFORMANCE
Initial Offset
Maximum Offset over Temperature
Offset Drift
Input Bias Current
At T
MAX
Input Offset Current
At T
MAX
Open-Loop Gain
T
MIN
to T
MAX
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range
Input Resistance
Input Capacitance
Common-Mode Rejection Ratio
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
L
= ±100 µA
I
L
= ±2 mA
I
L
= ±10 mA
Linear Output Current
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current
Power Supply Rejection Ratio
Conditions
G = +1, V
OUT
≤ 0.2 V p-p, V
CM
= 0.65 V
V
OUT
= 2 V p-p
G = −1, V
OUT
= 2 V step, V
CM
= 0.65 V
G = −1, V
OUT
= 2 V step
G = −1, V
OUT
= 2 V step
f = 10 kHz
f = 1 kHz
V
OUT
= 2 V p-p, f = 20 kHz, G = −1, R
F
= R
G
= 4 kΩ
V
OUT
= 2 V p-p, f = 20 kHz, G = +1, R
L
= 100 Ω
R
L
= 5 kΩ
R
L
= 5 kΩ
Min
13.8
18
Typ
17.3
3.7
23
350
460
14
1
−108
−70
−123
−77
0.14
0.3
1
0.3
10
0.3
3.5
63
Data Sheet
Max
Unit
MHz
MHz
V/µs
ns
ns
nV/√Hz
fA/√Hz
dBc
dBc
dB
dB
1
1.8
25
25
20
V
CM
= 0 V to 2 V
V
CM
= 0 V to 2 V
V
OUT
= 0.2 V to 2 V, R
L
= 2 kΩ
16
14
−0.2 to
+1
mV
mV
µV/°C
pA
pA
pA
pA
V/mV
V/mV
V
Ω
pF
pF
dB
−0.2 to +1.8
10
13
0.6
1.3
71
Differential Mode
Common Mode
V
CM
= 0 V to 1 V
54
V
OUT
= 0.5 V to 2.5 V
Sourcing to 1.5 V
Sinking to 1.5 V
G = +1
3
T
MIN
to T
MAX
, total
V
S
= 3.3 V to 15 V, T
MIN
to T
MAX
70
0.006 to 3.28
0.04 to 3.26
0.093 to 3.18
40
44
86
500
36
5.7
V
V
V
mA
mA
mA
pF
V
mA
dB
5.0
80
Rev.
B
| Page 4 of 20
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