Dual Picoampere Input
Current Bipolar Op Amp
AD706
FEATURES
CONNECTION DIAGRAM
High DC Precision
100 ꢀV Max Offset Voltage
1.5 ꢀV/ꢁC Max Offset Drift
200 pA Max Input Bias Current
0.5 ꢀV p-p Voltage Noise, 0.1 Hz to 10 Hz
750 ꢀA Supply Current
Available in 8-Lead Plastic Mini-DlP
and Surface-Mount (SOIC) Packages
Available in Tape and Reel in Accordance with
EIA-481A Standard
Plastic Mini-DIP (N) and
Plastic SOIC (R) Packages
AMPLIFIER 1
AMPLIFIER 2
AD706
OUTPUT
–IN
1
2
3
4
8
7
6
5
Vꢂ
OUTPUT
–IN
ꢂIN
V–
ꢂIN
Quad Version: AD704
TOP VIEW
APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD706 is a dual, low power, bipolar op amp that has the
low input bias current of a JFET amplifier, but which offers a
significantly lower IB drift over temperature. It utilizes superbeta
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 5ϫ at 125°C (unlike a
JFET amp, for which IB doubles every 10°C for a 1000ϫ
increase at 125°C). The AD706 also achieves the microvolt
offset voltage and low noise characteristics of a precision bipolar
input amplifier.
1. The AD706 is a dual low drift op amp that offers JFET
level input bias currents, yet has the low IB drift of a bipolar
amplifier. It may be used in circuits using dual op amps
such as the LT1024.
2. The AD706 provides both low drift and high dc precision.
3. The AD706 can be used in applications where a chopper
amplifier would normally be required but without the
chopper’s inherent noise.
Since it has < 200 pA of bias current, the AD706 does not
require the commonly used “balancing” resistor. Furthermore,
the current noise is only 50 fA/√Hz, which makes this amplifier
usable with very high source impedances. At 600 A max supply
current (per amplifier), the AD706 is well suited for today’s
high density boards.
100
10
TYPICAL JFET AMP
1
The AD706 is an excellent choice for use in low frequency
active filters in 12-bit and 14-bit data acquisition systems, in
precision instrumentation, and as a high quality integrator. The
AD706 is internally compensated for unity gain and is available
in five performance grades. The AD706J is rated over the
commercial temperature range of 0°C to +70°C. The AD706A is
rated for the extended industrial temperature range of –40°C
to +85°C.
0.1
AD706
0.01
–55
+25
+110
+125
TEMPERATURE – ꢁC
The AD706 is offered in two varieties of an 8-lead package:
plastic mini-DIP and surface-mount (SOIC).
Figure 1. Input Bias Current vs. Temperature
REV. E
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. 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
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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