AD706A Analog Devices, AD706A Datasheet

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AD706A

Manufacturer Part Number
AD706A
Description
Manufacturer
Analog Devices
Datasheet

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a
PRODUCT DESCRIPTION
The 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 I
bipolar input transistors to achieve picoampere input bias cur-
rent levels (similar to FET input amplifiers at room tempera-
ture), while its I
a BiFET amp, for which I
increase at 125 C). The AD706 also achieves the microvolt
offset voltage and low noise characteristics of a precision bipolar
input amplifier.
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.
The 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. The
AD706 is internally compensated for unity gain and is available
in five performance grades. The AD706J and AD706K are rated
over the commercial temperature range of 0 C to +70 C. The
AD706A and AD706B are rated over the industrial temperature
range of –40 C to +85 C.
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, 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.
FEATURE
HIGH DC PRECISION
50 V max Offset Voltage
0.6 V/ C max Offset Drift
110 pA max Input Bias Current
LOW NOISE
0.5 V p-p Voltage Noise, 0.1 Hz to 10 Hz
LOW POWER
750 A Supply Current
Available in 8-Lead Plastic Mini-DlP, Hermetic Cerdip
Available in Tape and Reel in Accordance with
Single Version: AD705, Quad Version: AD704
PRIMARY APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
and Surface Mount (SOIC) Packages
EIA-481A Standard
B
typically only increases by 5 at 125 C (unlike
B
drift over temperature. It utilizes superbeta
B
doubles every 10 C for a 1000
PRODUCT HIGHLIGHTS
1. The AD706 is a dual low drift op amp that offers BiFET
2. The AD706 provides both low drift and high dc precision.
3. The AD706 can be used in applications where a chopper
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
The 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.
level input bias currents, yet has the low I
amplifier. It may be used in circuits using dual op amps such
as the LT1024.
amplifier would normally be required but without the
chopper’s inherent noise.
0.01
100
Figure 1. Input Bias Current vs. Temperature
0.1
10
1
–55
Current Bipolar Op Amp
AMPLIFIER 1
OUTPUT
Dual Picoampere Input
CONNECTION DIAGRAM
Plastic SOIC (R) Packages
–IN
V–
IN
World Wide Web Site: http://www.analog.com
Plastic Mini-DIP (N)
1
2
3
4
+25
Cerdip (Q) and
TYPICAL JFET AMP
TEMPERATURE – C
TOP VIEW
AD706
AD706
AMPLIFIER 2
© Analog Devices, Inc., 1997
+110
8
7
6
5
OUTPUT
–IN
V
IN
B
drift of a bipolar
AD706
+125

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AD706A Summary of contents

Page 1

... AD706 is internally compensated for unity gain and is available in five performance grades. The AD706J and AD706K are rated over the commercial temperature range +70 C. The AD706A and AD706B are rated over the industrial temperature range of – +85 C. REV. C Information furnished by Analog Devices is believed to be accurate and reliable ...

Page 2

AD706–SPECIFICATIONS Parameter INPUT OFFSET VOLTAGE Initial Offset Offset vs. Temp, Average TC vs. Supply (PSRR MIN MAX Long Term Stability 1 INPUT BIAS CURRENT vs. Temp, Average MIN MAX MIN ...

Page 3

... Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range ( – +150 C Storage Temperature Range ( – +125 C Operating Temperature Range AD706J +70 C AD706A – +85 C Lead Temperature (Soldering 10 secs +300 C NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...

Page 4

AD706–Typical Characteristics 1000 SAMPLE SIZE: 3000 800 600 400 200 0 –80 – INPUT OFFSET VOLTAGE – V Figure 2. Typical Distribution of Input Offset Voltage V S –0.5 –1.0 –1.5 1.5 1.0 0.5 – ...

Page 5

FREQUENCY – Hz Figure 11. Input Noise Voltage Spectral Density 1000 900 800 +125 C +25 C 700 –55 C 600 SUPPLY VOLTAGE – Volts Figure 14. ...

Page 6

AD706 –80 –100 –120 –140 –160 10 100 1k FREQUENCY – Hz Figure 20a. Crosstalk vs. Frequency +V 0 1/2 1 AD706 3 4 0.1 F SINE WAVE GENERATOR –V S 20k + 2.21k ...

Page 7

... R G 10.1 101.0 1001 For a much more comprehensive discussion of in-amp applica- tions, refer to the Instrumentation Amplifier Applications Guide— available free from Analog Devices, Inc. –7– AD706 V OUT Figure 23d. Unity Gain Inverter Small Signal Pulse Response can be calculated using ...

Page 8

AD706 R1 1M INPUT *WITHOUT THE NETWORK, PINS 1 & 2, AND 6 & THE AD706 ARE TIED TOGETHER. CAPACITORS C1 & C2 ARE SOUTHERN ELECTRONICS MPCC, POLYCARB 5%, 50 VOLT A 1 Hz, 4-Pole, Active Filter Figure ...

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