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AD823AARZ-R7 ADI芯片 电子元器件中文版规格手册.pdf
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AD823AARZ-R7 ADI芯片 电子元器件中文版规格手册
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Wide Supply Dual, 17 MHz, Rail-to-Rail
FET Input Amplifier
Data Sheet
AD823A
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.
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.
FEATURES
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
APPLICATIONS
Photodiode preamps
Active filters
12-bit to 16-bit data acquisition systems
Medical instrumentation
Precision instrumentation
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.
CONNECTION DIAGRAM
AD823A
OUT1
+IN2
–IN2
OUT2
+V
S
–IN1
+IN1
–V
S
1
2
3
4
8
7
6
5
09439-001
Figure 1. 8-Lead SOIC
09439-102
OUT1 1
–IN1
2
+IN1 3
–V
S
4
+V
S
8
OUT2
7
–IN26
+IN25
AD823A
TOP VIEW
(Not to Scale)
Figure 2. 8-Lead MSOP
200µs/DIV
500mV/DIV
0V
3.0V
1.5V
0
9439-049
V
S
= 3V
C
L
= 50pF
G = +1
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.
AD823A Data Sheet
Rev. B | Page 2 of 20
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
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
Data Sheet AD823A
Rev. | Page 3 of 20
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 Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
−3 dB Bandwidth G = +1, V
OUT
≤ 0.2 V p-p 14.1 17 MHz
Full Power Response V
OUT
= 2 V p-p 4.8 MHz
Slew Rate
G = −1, V
OUT
= 4 V step
25
30
V/µs
Settling Time
To 0.1% G = −1, V
OUT
= 2 V step 240 ns
To 0.01% G = −1, V
OUT
= 2 V step 325 ns
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise f = 10 kHz 14 nV/√Hz
Input Current Noise f = 1 kHz 1 fA/√Hz
Harmonic Distortion (SFDR) V
OUT
= 2 V p-p, f = 20 kHz, G = −1, R
F
= R
G
= 4 kΩ −108 dBc
V
OUT
= 2 V p-p, f = 20 kHz, G = +1, R
L
= 1 kΩ
−99
dBc
Crosstalk
f = 1 kHz R
L
= 5 kΩ −123 dB
f = 1 MHz R
L
= 5 kΩ −77 dB
DC PERFORMANCE
Initial Offset 0.12 0.7 mV
Maximum Offset over Temperature
0.2
1.3
mV
Offset Drift 1 µV/°C
Input Bias Current V
CM
= 0 V to 4 V 0.3 25 pA
At T
MAX
V
CM
= 0 V to 4 V 10 25 pA
Input Offset Current 0.3 20 pA
At T
MAX
3.5 pA
Open-Loop Gain
V
OUT
= 0.2 V to 4 V, R
L
= 2 kΩ
40
175
V/mV
T
MIN
to T
MAX
25 V/mV
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range −0.2 to +3 −0.2 to +3.8 V
Input Resistance 10
13
Ω
Input Capacitance Differential Mode 0.6 pF
Common Mode 1.3 pF
Common-Mode Rejection Ratio V
CM
= 0 V to 3 V 60 73 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
L
= ±100 µA 0.009 to 4.98 V
I
L
= ±2 mA
0.026 to 4.96
V
I
L
= ±10 mA 0.097 to 4.88 V
Linear Output Current V
OUT
= 0.5 V to 4.5 V 40 mA
Short-Circuit Current Sourcing to 2.5 V 50 mA
Sinking to 2.5 V 101 mA
Capacitive Load Drive G = +1 500 pF
POWER SUPPLY
Operating Range 3 36 V
Quiescent Current T
MIN
to T
MAX
, total 5.1 5.7 mA
Power Supply Rejection Ratio V
S
= 5 V to 15 V, T
MIN
to T
MAX
70 94 dB
B
AD823A Data Sheet
Rev. | Page 4 of 20
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 Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
−3 dB Bandwidth G = +1, V
OUT
≤ 0.2 V p-p, V
CM
= 0.65 V 13.8 17.3 MHz
Full Power Response V
OUT
= 2 V p-p 3.7 MHz
Slew Rate G = −1, V
OUT
= 2 V step, V
CM
= 0.65 V 18 23 V/µs
Settling Time
To 0.1%
G = −1, V
OUT
= 2 V step
350
ns
To 0.01% G = −1, V
OUT
= 2 V step 460 ns
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise
f = 10 kHz
14
nV/√Hz
Input Current Noise f = 1 kHz 1 fA/√Hz
Harmonic Distortion (SFDR) V
OUT
= 2 V p-p, f = 20 kHz, G = −1, R
F
= R
G
= 4 kΩ −108 dBc
V
OUT
= 2 V p-p, f = 20 kHz, G = +1, R
L
= 100 Ω −70 dBc
Crosstalk
f = 1 kHz
R
L
= 5 kΩ
−123
dB
f = 1 MHz R
L
= 5 kΩ −77 dB
DC PERFORMANCE
Initial Offset
0.14
1
mV
Maximum Offset over Temperature 0.3 1.8 mV
Offset Drift 1 µV/°C
Input Bias Current V
CM
= 0 V to 2 V 0.3 25 pA
At T
MAX
V
CM
= 0 V to 2 V 10 25 pA
Input Offset Current 0.3 20 pA
At T
MAX
3.5
pA
Open-Loop Gain V
OUT
= 0.2 V to 2 V, R
L
= 2 kΩ 16 63 V/mV
T
MIN
to T
MAX
14 V/mV
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range
−0.2 to
+1
−0.2 to +1.8 V
Input Resistance 10
13
Ω
Input Capacitance Differential Mode 0.6 pF
Common Mode
1.3
pF
Common-Mode Rejection Ratio V
CM
= 0 V to 1 V 54 71 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
L
= ±100 µA 0.006 to 3.28 V
I
L
= ±2 mA 0.04 to 3.26 V
I
L
= ±10 mA 0.093 to 3.18 V
Linear Output Current V
OUT
= 0.5 V to 2.5 V 40 mA
Short-Circuit Current Sourcing to 1.5 V 44 mA
Sinking to 1.5 V 86 mA
Capacitive Load Drive G = +1 500 pF
POWER SUPPLY
Operating Range 3 36 V
Quiescent Current T
MIN
to T
MAX
, total 5.0 5.7 mA
Power Supply Rejection Ratio V
S
= 3.3 V to 15 V, T
MIN
to T
MAX
70 80 dB
B
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