Single Supply, Rail-to-Rail
Low Power, FET-Input Op Amp
Data Sheet
AD824
FEATURES PIN CONFIGURATION
Single supply operation: 3 V to 30 V
OUT A 1 OUT D
14
Very low input bias current: 2 pA
2 IN D
IN A 13
Wide input voltage range
3 AD824 +IN D
+IN A 12
Rail-to-rail output swing TOP VIEW
4 V
V+ 11
(Not to Scale)
Low supply current per amplifier: 500 A
5 +IN C
+IN B 10
Wide bandwidth: 2 MHz
6 IN C
IN B 9
Slew rate: 2 V/s
OUT C
OUT B 7 8
No phase reversal
Figure 1. 14-Lead SOIC (R Suffix)
APPLICATIONS
Photo diode preamplifier
Battery powered instrumentation
Power supply control and protection
Medical instrumentation
Remote sensors
Low voltage strain gage amplifiers
DAC output amplifier
GENERAL DESCRIPTION
The AD824 is a quad, FET input, single supply amplifier, The FET input combined with laser trimming provides an input
featuring rail-to-rail outputs. The combination of FET inputs that has extremely low bias currents with guaranteed offsets
and rail-to-rail outputs makes the AD824 useful in a wide below 1 mV. This enables high accuracy designs even with high
variety of low voltage applications where low input current is source impedances. Precision is combined with low noise,
a primary consideration. making the AD824 ideal for use in battery powered medical
equipment.
The AD824 is guaranteed to operate from a 3 V single supply
up to 15 V dual supplies. AD824AR-3V parametric Applications for the AD824 include portable medical
performance at 3 V is fully guaranteed. equipment, photo diode preamplifiers, and high impedance
transducer amplifiers.
Fabricated on Analog Devices, Inc., complementary bipolar
process, the AD824 has a unique input stage that allows the The ability of the output to swing rail-to-rail enables designers
input voltage to safely extend beyond the negative supply and to build multistage filters in single supply systems and maintain
to the positive supply without any phase inversion or latch-up. high signal-to-noise ratios.
The output voltage swings to within 15 mV of the supplies.
The AD824 is specified over the extended industrial (40C to
Capacitive loads to 350 pF can be handled without oscillation.
+85C) temperature range and is available in narrow 14-lead
SOIC package.
Rev. E Document Feedback
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00875-001AD824 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Input Characteristics .................................................................. 12
Applications ....................................................................................... 1 Output Characteristics............................................................... 12
Pin Configuration ............................................................................. 1 Applications Information .............................................................. 13
General Description ......................................................................... 1 Single Supply Voltage-to-Frequency Converter ..................... 13
Revision History ............................................................................... 2 Single Supply Programmable Gain Instrumentation
Amplifier ..................................................................................... 13
Specifications ..................................................................................... 3
3 V, Single Supply Stereo Headphone Driver ......................... 14
Electrical Specifications ............................................................... 3
Low Dropout Bipolar Bridge Driver ........................................ 14
Absolute Maximum Ratings ............................................................ 6
A 3.3 V/5 V Precision Sample-and-Hold Amplifier .............. 15
Thermal Resistance ...................................................................... 6
Outline Dimensions ....................................................................... 16
ESD Caution .................................................................................. 6
Ordering Guide .......................................................................... 16
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 12
REVISION HISTORY
4/15Rev. D to Rev. E
Change to Figure 1 Caption ............................................................ 1
5/14Rev. 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
2/03Rev. 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
1/02Rev. 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