a
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: 500 A/Amp
Wide Bandwidth: 2 MHz
Slew Rate: 2 V/ s
No Phase Reversal
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
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
Single Supply, Rail-to-Rail
Low Power, FET-Input Op Amp
AD824
PIN CONFIGURATIONS
14-Lead Epoxy DIP
(N Suffix)
14-Lead Epoxy SO
(R Suffix)
1
2
3
4
5
6
7
TOP VIEW
14 OUT D
13 –IN D
12 +IN D
OUT A
–IN A
+IN A
V+
+INB
–INB
OUTB
1
2
3
4
5
6
7
14
13
OUT D
–IN D
AD824
12 +IN D
V–
+IN C
–IN C
OUT C
AD824
11 V–
10 +IN C
9
8
–IN C
OUT C
11
TOP VIEW
(Not to Scale) 10
9
8
16-Lead Epoxy SO
(R Suffix)
The AD824 is a quad, FET input, single supply amplifier, fea-
turing 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 volt dual supplies.
Fabricated on ADI’s 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 latchup. The output voltage
swings to within 15 millivolts 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 be-
low 300
µV.
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.
OUT A 1
–IN A
2
16 OUT D
15 –IN D
14 +IN D
+IN A 3
V+ 4
+IN B 5
–IN B
6
AD824
13 V–
12 +IN C
11 –IN C
10 OUT C
9
NC
OUT B 7
NC 8
NC = NO CONNECT
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 14-pin DIP and
narrow 14-pin and 16-pin SO packages.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997
AD [ ANALOG DEVICES ]
