Quad Picoampere Input Current
Bipolar Op Amp
a
AD704
FEATURES
CONNECTION DIAGRAMS
High DC Precision
14-Lead Plastic DIP (N)
14-Lead CerDIP (Q) Packages
16-Lead SOIC
(R) Package
75 V Max Offset Voltage
1 V/؇C Max Offset Voltage Drift
150 pA Max Input Bias Current
0.2 pA/؇C Typical IB Drift
Low Noise
1
2
3
4
5
6
7
14
1
2
3
4
5
6
7
8
OUTPUT
16
15
OUTPUT OUTPUT
OUTPUT
13
12
4
1
–IN
+IN
–IN
+IN
–V
4
–IN
1
–IN
0.5 V p-p Typical Noise, 0.1 Hz to 10 Hz
Low Power
+IN
14
13
12
11
10
9
+IN
AD704
(TOPVIEW
AD704
(TOPVIEW)
11
10
9
+V
S
–V
+V
S
S
S
600 A Max Supply Current per Amplifier
MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance
with EIA-481A Standard
Dual Version: AD706
)
+IN
–IN
+IN
+IN
–IN
+IN
2
2
3
3
–IN
–IN
8
OUTPUT
OUTPUT
OUTPUT
OUTPUT
NC
NC
APPLICATIONS
NC = NO CONNECT
Industrial/Process Controls
Weigh Scales
ECG/EKG Instrumentation
Low Frequency Active Filters
20-Terminal LCC
(E) Package
3
2
1
20 19
PRODUCT DESCRIPTION
+IN4
NC
18
17
16
+IN1 4
NC 5
+V
The AD704 is a quad, low power bipolar op amp that has the
low input bias current of a BiFET amplifier but which offers a
significantly lower IB drift over temperature. It utilizes super-beta
bipolar input transistors to achieve picoampere input bias current
levels (similar to FET input amplifiers at room temperature),
while its IB typically only increases by 5× at 125°C (unlike a
BiFET amp, for which IB doubles every 10°C resulting in a
1000× increase at 125°C). Furthermore, the AD704 achieves
75 µV offset voltage and low noise characteristics of a precision
bipolar input op amp.
AMP 1
AMP 4
–V
6
S
AD704
S
AMP 2
AMP 3
NC 7
15
14
NC
+IN3
+IN2 8
9
10 11 12 13
NC = NO CONNECT
Since it has only 1/20 the input bias current of an AD OP07, the
AD704 does not require the commonly used “balancing” resistor.
Furthermore, the current noise is 1/5 that of the AD OP07 which
makes the AD704 usable with much higher source impedances.
At 1/6 the supply current (per amplifier) of the AD OP07, the
AD704 is better suited for today’s higher density circuit boards
and battery-powered applications.
100
10
TYPICAL JFET AMP
1
The AD704 is an excellent choice for use in low frequency active
filters in 12- and 14-bit data acquisition systems, in precision
instrumentation, and as a high quality integrator. The AD704 is
internally compensated for unity gain and is available in five
performance grades. The AD704J and AD704K are rated over
the commercial temperature range of 0°C to 70°C. The AD704A
is rated over the industrial temperature of –40°C to +85°C. The
AD704T is rated over the military temperature range of –55°C
to +125°C and is available processed to MIL-STD-883B, Rev. C.
0.1
AD704T
0.01
–55
+25
+125
TEMPERATURE –
C
Figure 1. Input Bias Current Over Temperature
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
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: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
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