AD706 Analog Devices, AD706 Datasheet

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AD706

Manufacturer Part Number
AD706
Description
Dual Picoampere Input Current Bipolar Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD706

-3db Bandwidth
800kHz
Slew Rate
150mV/µs
Vos
30µV
Ib
50pA
# Opamps Per Pkg
2
Input Noise (nv/rthz)
15nV/rtHz
Vcc-vee
4V to 36V
Isy Per Amplifier
600µA
Packages
DIP,SOIC

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GENERAL DESCRIPTION
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 I
bipolar input transistors to achieve picoampere input bias current
levels (similar to FET input amplifiers at room temperature),
while its I
JFET 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 < 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.
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.
The AD706 is offered in two varieties of an 8-lead package:
plastic mini-DIP and surface-mount (SOIC).
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, nor for any infringements of patents or other rights of third parties that
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.
FEATURES
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
Available in Tape and Reel in Accordance with
Quad Version: AD704
APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
and Surface-Mount (SOIC) Packages
EIA-481A Standard
B
typically only increases by 5
B
drift over temperature. It utilizes superbeta
B
doubles every 10°C for a 1000
at 125°C (unlike a
PRODUCT HIGHLIGHTS
1. The AD706 is a dual low drift op amp that offers JFET
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
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
0.1
Figure 1. Input Bias Current vs. Temperature
10
1
–55
AMPLIFIER 1
OUTPUT
Current Bipolar Op Amp
Dual Picoampere Input
CONNECTION DIAGRAM
Plastic SOIC (R) Packages
Plastic Mini-DIP (N) and
–IN
V–
© 2003 Analog Devices, Inc. All rights reserved.
IN
1
2
3
4
+25
TYPICAL JFET AMP
TEMPERATURE – C
TOP VIEW
AD706
AD706
AMPLIFIER 2
8
7
6
5
+110
V
OUTPUT
–IN
IN
B
AD706
drift of a bipolar
www.analog.com
+125

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AD706 Summary of contents

Page 1

... The AD706 also achieves the microvolt offset voltage and low noise characteristics of a precision bipolar input amplifier. 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’ ...

Page 2

... kΩ 200 LOAD 150 MIN MAX ± kΩ LOAD ± MIN MAX Short Circuit Gain = +1 –2– AD706J/A Typ Max Unit µV 30 100 µV 40 150 µV/°C 0.2 1.5 132 dB 126 dB µV/Month 0.3 50 200 pA 250 pA 0.3 pA/° ...

Page 3

... V Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range ( –65°C to +125°C Operating Temperature Range AD706J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C AD706A . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C Lead Temperature (Soldering 10 secs 300°C NOTES ...

Page 4

... AD706–Typical Performance Characteristics (Default Conditions pF 1000 SAMPLE SIZE: 3000 800 600 400 200 0 –80 – INPUT OFFSET VOLTAGE – V TPC 1. Typical Distribution of Input Offset Voltage V S –0.5 –1.0 –1.5 1.5 1.0 0.5 – SUPPLY VOLTAGE – ...

Page 5

... GAIN 180 20 210 0 240 –20 0.01 0 100 1k 10k 100k 1M 10M FREQUENCY – Hz TPC 17. Open-Loop Gain and Phase Shift vs. Frequency –5– AD706 0 TIME – Seconds TPC 12. 0 Noise Voltage 180 160 140 120 100 – PSRR 80 + PSRR 0.1 ...

Page 6

... F L –6– –1000 +1mA OUT 1 10 100 1k 10k FREQUENCY – 0 1/2 AD706 0.1 F SQUARE WAVE –V S INPUT limits the current F Figure 4d. Unity Gain Follower Small Signal Pulse Response Ω 1000 100k V ...

Page 7

... Figure 5b. Unity Gain Inverter Large Signal Pulse Response 1,000 pF L Figure 6 shows an in-amp circuit that has the obvious advantage of requiring only one AD706, rather than three op amps, with subsequent savings in cost and power consumption. The transfer function of this circuit (without − ...

Page 8

... Hz, 4-Pole, Active Filter Figure 7 shows the AD706 in an active filter application. An important characteristic of the AD706 is that both the input bias current, input offset current, and their drift remain low over most of the op amp’s rated temperature range. Therefore, for most applications, there is no need to use the normal balancing resistor ...

Page 9

... SEATING PLANE 0.060 (1.52) 0.050 (1.27) 0.045 (1.14) COMPLIANT TO JEDEC STANDARDS MO-095AA CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN –9– AD706 0.50 (0.0196) 45 0.25 (0.0099 1.27 (0.0500) 0.40 (0.0157) 0.150 (3.81) 0.135 (3.43) 0.120 (3.05) ...

Page 10

... AD706 Revision History Location 10/03–Data Sheet changed from REV REV. E Removed the K Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Updated FEATURES list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Updated PRODUCT DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Renumbered TPCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Renumbered Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 10/02–Data Sheet changed from REV REV. D Deleted 8-Lead CERDIP (Q-8) Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Edits to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to PRODUCT DESCRIPTION ...

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