Data Sheet
FEATURES
Single supply operation: 3 V to 30 V
Very low input bias current: 2 pA
Wide input voltage range
Rail-to-rail output swing
Low supply current per amplifier: 500 µA
Wide bandwidth: 2 MHz
Slew rate: 2 V/µs
No phase reversal
Single Supply, Rail-to-Rail
Low Power, FET-Input Op Amp
AD824
PIN CONFIGURATION
OUT A
1
–IN A
+IN A
V+
+IN B
–IN B
2
3
4
5
6
14
13
OUT D
–IN D
AD824
12
+IN D
TOP VIEW
(Not to Scale)
11
V–
10
9
8
+IN C
00875-001
–IN C
OUT C
OUT B
7
APPLICATIONS
Photo diode preamplifier
Battery powered instrumentation
Power supply control and protection
Medical instrumentation
Remote sensors
Low voltage strain gage amplifiers
DAC output amplifier
Figure 1. 14-Lead SOIC (R Suffix)
GENERAL DESCRIPTION
The
AD824
is a quad, FET input, single supply amplifier,
featuring rail-to-rail outputs. The combination of FET inputs
and rail-to-rail outputs makes the
AD824
useful in a wide
variety of low voltage applications where low input current is
a primary consideration.
The
AD824
is guaranteed to operate from a 3 V single supply
up to ±15 V dual supplies.
AD824AR-3V
parametric
performance at 3 V is fully guaranteed.
Fabricated on Analog Devices, Inc., complementary bipolar
process, the
AD824
has a unique input stage that allows the
input voltage to safely extend beyond the negative supply and
to the positive supply without any phase inversion or latch-up.
The output voltage swings to within 15 mV of the supplies.
Capacitive loads to 350 pF can be handled without oscillation.
The FET input combined with laser trimming provides an input
that has extremely low bias currents with guaranteed offsets
below 1 mV. This enables high accuracy designs even with high
source impedances. Precision is combined with low noise,
making the
AD824
ideal for use in battery powered medical
equipment.
Applications for the
AD824
include portable medical
equipment, photo diode preamplifiers, and high impedance
transducer amplifiers.
The ability of the output to swing rail-to-rail enables designers
to build multistage filters in single supply systems and maintain
high signal-to-noise ratios.
The
AD824
is specified over the extended industrial (−40°C to
+85°C) temperature range and is available in narrow 14-lead
SOIC package.
Rev. E
Document Feedback
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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.
AD824* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
DESIGN RESOURCES
•
AD824 Material Declaration
•
PCN-PDN Information
•
Quality And Reliability
•
Symbols and Footprints
DOCUMENTATION
Application Notes
•
AN-106: A Collection of Amp Applications
•
AN-253: Find Op Amp Noise with Spreadsheet
•
AN-357: Operational Integrators
•
AN-649: Using the Analog Devices Active Filter Design
Tool
Data Sheet
•
AD824: Single Supply, Rail-to-Rail Low Power, FET-Input
Op Amp Data Sheet
DISCUSSIONS
View all AD824 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
TOOLS AND SIMULATIONS
•
Analog Filter Wizard
•
Analog Photodiode Wizard
•
AD824 SPICE Macro-Model
DOCUMENT FEEDBACK
Submit feedback for this data sheet.
This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not
trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.
AD824
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Specifications ............................................................... 3
Absolute Maximum Ratings ............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution .................................................................................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 12
Data Sheet
Input Characteristics .................................................................. 12
Output Characteristics............................................................... 12
Applications Information .............................................................. 13
Single Supply Voltage-to-Frequency Converter ..................... 13
Single Supply Programmable Gain Instrumentation
Amplifier ..................................................................................... 13
3 V, Single Supply Stereo Headphone Driver ......................... 14
Low Dropout Bipolar Bridge Driver ........................................ 14
A 3.3 V/5 V Precision Sample-and-Hold Amplifier .............. 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 16
REVISION HISTORY
4/15—Rev. D to Rev. E
Change to Figure 1 Caption ............................................................ 1
5/14—Rev. C to Rev. D
Updated Format .................................................................. Universal
Removed 16-Lead SOIC Package (Throughout) .......................... 1
Deleted Wafer Test Limits Section ................................................. 5
Deleted AD824 SPICE Macro-model Section ............................ 15
Changes to Ordering Guide .......................................................... 16
2/03—Rev. B to Rev. C
Deleted N Package .............................................................. Universal
Edits to General Description........................................................... 1
Edits to Absolute Maximum Ratings ............................................. 5
Edits to Ordering Guide .................................................................. 5
Edits to Figure 4 .............................................................................. 12
Edits to Figure 8 .............................................................................. 13
Updated Outline Dimensions ....................................................... 16
1/02—Rev. A to Rev. B
Edits to Electrical Specifications................................................. 2, 3
Edits to Absolute Maximum Ratings ............................................. 5
Edits to Ordering Guide .................................................................. 5
Deleted Dice Characteristics ........................................................... 5
Rev. E | Page 2 of 16
Data Sheet
SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
At V
S
= 5.0 V, V
CM
= 0 V, V
OUT
= 0.2 V, T
A
= 25°C; unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage (AD824A)
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Symbol
V
OS
T
MIN
to T
MAX
I
B
T
MIN
to T
MAX
I
OS
T
MIN
to T
MAX
CMRR
V
CM
= 0 V to 2 V
V
CM
= 0 V to 3 V
T
MIN
to T
MAX
V
O
= 0.2 V to 4.0 V
R
L
= 2 kΩ
R
L
= 10 kΩ
R
L
= 100 kΩ
T
MIN
to T
MAX
, R
L
= 100 kΩ
−0.2
66
60
60
2
300
2
300
80
74
10
13
||3.3
A
VO
20
50
250
180
40
100
1000
400
2
4.988
4.985
4.85
4.82
15
20
120
140
±12
±10
100
80
500
2
150
2.5
2
50
–123
2
16
0.8
0.005
600
Test Conditions/Comments
Min
Typ
0.1
Max
1.0
1.5
12
4000
10
+3.0
AD824
Unit
mV
mV
pA
pA
pA
pA
V
dB
dB
dB
Ω||pF
V/mV
V/mV
V/mV
V/mV
µV/°C
V
V
V
V
mV
mV
mV
mV
mA
mA
Ω
dB
dB
µA
V/µs
kHz
µs
MHz
Degrees
dB
µV p-p
nV/√Hz
fA/√Hz
%
Input Impedance
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
ΔV
OS
/ΔT
V
OH
I
SOURCE
= 20 µA
T
MIN
to T
MAX
I
SOURCE
= 2.5 mA
T
MIN
to T
MAX
I
SINK
= 20 µA
T
MIN
to T
MAX
I
SINK
= 2.5 mA
T
MIN
to T
MAX
Sink/source
T
MIN
to T
MAX
f = 1 MHz, A
V
= 1
V
S
= 2.7 V to 12 V
T
MIN
to T
MAX
T
MIN
to T
MAX
R
L
= 10 kΩ, A
V
= 1
1% distortion, V
O
= 4 V p-p
V
OUT
= 0.2 V to 4.5 V, to 0.01%
No load
f = 1 kHz, R
L
= 2 kΩ
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
f = 10 kHz, R
L
= ∞, A
V
= +1
4.975
4.97
4.80
4.75
Output Voltage Low
V
OL
25
30
150
200
Short Circuit Limit
Open-Loop Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Full-Power Bandwidth
Settling Time
Gain Bandwidth Product
Phase Margin
Channel Separation
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
Total Harmonic Distortion
I
SC
Z
OUT
PSRR
I
SY
SR
BW
P
t
S
GBP
φo
CS
e
n
p-p
e
n
i
n
THD
70
66
Rev. E | Page 3 of 16
AD824
At V
S
= ±15.0 V, V
OUT
= 0 V, T
A
= 25°C; unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage (AD824A)
Input Bias Current
Symbol
V
OS
I
B
I
B
I
OS
T
MIN
to T
MAX
V
CM
= 0 V
T
MIN
to T
MAX
V
CM
= −10 V
T
MIN
to T
MAX
Input Voltage Range
Common-Mode Rejection Ratio
Input Impedance
Large Signal Voltage Gain
CMRR
V
CM
= −15 V to 13 V
T
MIN
to T
MAX
V
O
= −10 V to +10 V;
R
L
= 2 kΩ
R
L
= 10 kΩ
R
L
= 100 kΩ
T
MIN
to T
MAX
, R
L
= 100 kΩ
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
ΔV
OS
/ΔT
V
OH
I
SOURCE
= 20 µA
T
MIN
to T
MAX
I
SOURCE
= 2.5 mA
T
MIN
to T
MAX
I
SINK
= 20 µA
T
MIN
to T
MAX
I
SINK
= 2.5 mA
T
MIN
to T
MAX
Sink/source, T
MIN
to T
MAX
f = 1 MHz, A
V
= 1
V
S
= 2.7 V to 15 V
T
MIN
to T
MAX
V
O
= 0 V
T
MIN
to T
MAX
R
L
= 10 kΩ, A
V
= 1
1% distortion, V
O
= 20 V p-p
V
OUT
= 0 V to 10 V, to 0.01%
14.975
14.970
14.80
14.75
−15
70
66
Test Conditions/Comments
Min
Typ
0.5
0.6
4
500
25
3
500
80
10
13
||3.3
A
VO
12
50
300
200
50
200
2000
1000
2
14.988
14.985
14.85
14.82
–14.985
–14.98
–14.88
–14.86
±20
100
80
560
Data Sheet
Max
2.5
4.0
35
4000
20
+13
Unit
mV
mV
pA
pA
pA
pA
pA
V
dB
dB
Ω||pF
V/mV
V/mV
V/mV
V/mV
µV/°C
V
V
V
V
V
V
V
V
mA
Ω
dB
dB
µA
µA
V/µs
kHz
µs
MHz
Degrees
dB
µV p-p
nV/√Hz
fA/√Hz
%
Input Offset Current
Output Voltage Low
V
OL
–14.975
–14.97
–14.85
–14.8
Short Circuit Limit
Open-Loop Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Full-Power Bandwidth
Settling Time
Gain Bandwidth Product
Phase Margin
Channel Separation
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
Total Harmonic Distortion
I
SC
Z
OUT
PSRR
I
SY
±8
70
68
625
675
SR
BW
P
t
S
GBP
φo
CS
e
n
p-p
e
n
i
n
THD
f = 1 kHz, R
L
= 2 kΩ
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
f =10 kHz, V
O
= 3 V rms, R
L
= 10 kΩ
2
33
6
2
50
–123
2
16
1.1
0.005
Rev. E | Page 4 of 16
