Dual Picoampere Input
Current Bipolar Op Amp
a
AD706
FEATURE
CO NNECTIO N D IAGRAM
HIGH DC PRECISION
P lastic Mini-D IP (N)
Cerdip (Q) and
P lastic SO IC (R) P ackages
50 V m ax Offset Voltage
0.6 V/ ؇C m ax Offset Drift
110 pA m ax Input Bias Current
LOW NOISE
0.5 V p-p Voltage Noise, 0.1 Hz to 10 Hz
AMPLIFIER 1
AMPLIFIER 2
AD706
OUTPUT
–IN
1
2
3
4
8
7
6
5
V؉
LOW POWER
750 A Supply Current
Available in 8-Lead Plastic Mini-DlP, Herm etic Cerdip
and Surface Mount (SOIC) Packages
Available in Tape and Reel in Accordance w ith
EIA-481A Standard
OUTPUT
–IN
؉IN
V–
؉IN
TOP VIEW
Single Version: AD705, Quad Version: AD704
PRIMARY APPLICATIONS
Low Frequency Active Filters
Precision Instrum entation
Precision Integrators
T he AD706 is offered in three varieties of an 8-lead package:
plastic mini-DIP, hermetic cerdip and surface mount (SOIC).
“J” grade chips are also available.
P RO D UCT D ESCRIP TIO N
P RO D UCT H IGH LIGH TS
T he AD706 is a dual, 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 superbeta
bipolar input transistors to achieve picoampere input bias cur-
rent levels (similar to FET input amplifiers at room tempera-
ture), while its IB typically only increases by 5× at 125°C (unlike
a BiFET amp, for which IB doubles every 10°C for a 1000×
increase at 125°C). T he AD706 also achieves the microvolt
offset voltage and low noise characteristics of a precision bipolar
input amplifier.
1. T he AD706 is a dual low drift op amp that offers BiFET
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 LT 1024.
2. T he AD706 provides both low drift and high dc precision.
3. T he AD706 can be used in applications where a chopper
amplifier would normally be required but without the
chopper’s inherent noise.
100
Since it has only 1/20 the input bias current of an OP07, the
AD706 does not require the commonly used “balancing” resis-
tor. Furthermore, the current noise is 1/5 that of the OP07,
which makes this amplifier usable with much higher source
impedances. At 1/6 the supply current (per amplifier) of the
OP07, the AD706 is better suited for today’s higher density
boards.
10
TYPICAL JFET AMP
1
T he AD706 is an excellent choice for use in low frequency
active filters in 12- and 14-bit data acquisition systems, in preci-
sion instrumentation and as a high quality integrator. T he
AD706 is internally compensated for unity gain and is available
in five performance grades. T he AD706J and AD706K are rated
over the commercial temperature range of 0°C to +70°C. T he
AD706A and AD706B are rated over the industrial temperature
range of –40°C to +85°C.
0.1
AD706
0.01
–55
+25
+110
+125
TEMPERATURE – ؇C
Figure 1. Input Bias Current vs. Tem perature
REV. C
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1997
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