Analog Devices AD706KN, AD706JR-REEL, AD706JR, AD706JN, AD706AR-REEL Datasheet
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Dual Picoampere Input
a
FEATURE
HIGH DC PRECISION
50 mV max Offset Voltage
0.6 mV/8C max Offset Drift
110 pA max Input Bias Current
LOW NOISE
0.5 mV p-p Voltage Noise, 0.1 Hz to 10 Hz
LOW POWER
750 mA Supply Current
Available in 8-Lead Plastic Mini-DlP, Hermetic Cerdip
and Surface Mount (SOIC) Packages
Available in Tape and Reel in Accordance with
EIA-481A Standard
Single Version: AD705, Quad Version: AD704
PRIMARY APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
Current Bipolar Op Amp
AD706
CONNECTION DIAGRAM
Plastic Mini-DIP (N)
Cerdip (Q) and
Plastic SOIC (R) Packages
AMPLIFIER 1 AMPLIFIER 2
AD706
TOP VIEW
8
7
6
5
V1
OUTPUT
–IN
1INV–
–IN
1IN
1
2
3
4
OUTPUT
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.
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
drift over temperature. It utilizes superbeta
B
bipolar input transistors to achieve picoampere input bias current levels (similar to FET input amplifiers at room temperature), while its I
a BiFET amp, for which I
typically only increases by 5× at 125°C (unlike
B
doubles every 10°C for a 1000×
B
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” resistor. 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 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 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.
PRODUCT HIGHLIGHTS
1. The AD706 is a dual low drift op amp that offers BiFET
level input bias currents, yet has the low I
drift of a bipolar
B
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.
100
10
– nA
B
1
TYPICAL I
0.1
0.01
–55 +125+25 +110
TYPICAL JFET AMP
AD706
TEMPERATURE – 8C
Figure 1. Input Bias Current vs. 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, 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 1997
AD706–SPECIFICA TIONS
(@ TA = +258C, VCM = 0 V and 615 V dc, unless otherwise noted)
AD706J/A AD706K/B
Parameter Conditions Min Typ Max Min Typ Max Units
INPUT OFFSET VOLTAGE
Initial Offset 30 100 10 50 µV
Offset T
MIN
to T
MAX
40 150 25 100 µV
vs. Temp, Average TC 0.2 1.5 0.2 0.6 µV/°C
vs. Supply (PSRR) VS = ±2 V to ±18 V 110 132 112 132 dB
T
MIN
to T
MAX
VS = ±2.5 V to ±18 V 106 126 108 126 dB
Long Term Stability 0.3 0.3 µV/Month
INPUT BIAS CURRENT
1
VCM = 0 V 50 200 30 110 pA
VCM = ±13.5 V 250 160 pA
vs. Temp, Average TC 0.3 0.2 pA/°C
T
to T
MIN
MIN
to T
MAX
MAX
T
VCM = 0 V 300 200 pA
VCM = ±13.5 V 400 300 pA
INPUT OFFSET CURRENT VCM = 0 V 30 150 30 100 pA
VCM = ±13.5 V 250 200 pA
vs. Temp, Average TC 0.6 0.4 pA/°C
T
to T
MIN
MIN
to T
MAX
MAX
T
VCM = 0 V 80 250 80 200 pA
VCM = ±13.5 V 80 350 80 300 pA
MATCHING CHARACTERISTICS
Offset Voltage 150 75 µV
Input Bias Current
to T
MIN
MIN
to T
MAX
MAX
2
T
250 150 µV
300 150 pA
500 250 pA
T
Common-Mode Rejection 106 110 dB
T
MIN
to T
MAX
106 108 dB
Power Supply Rejection 106 110 dB
T
MIN
to T
MAX
104 106 dB
Crosstalk @ f = 10 Hz
(Figure 19a) RL = 2 kΩ 150 150 dB
FREQUENCY RESPONSE
Unity Gain Crossover
Frequency 0.8 0.8 MHz
Slew Rate G = –1 0.15 0.15 V/µs
T
MIN
to T
MAX
0.15 0.15 V/µs
INPUT IMPEDANCE
Differential 40i2 40i2MΩipF
Common Mode 300i2 300i2GΩipF
INPUT VOLTAGE RANGE
Common-Mode Voltage ± 13.5 ±14 ±13.5 ±14 V
Common-Mode Rejection
Ratio VCM = ±13.5 V 110 132 114 132 dB
T
MIN
to T
MAX
108 128 108 128 dB
INPUT CURRENT NOISE 0.1 Hz to 10 Hz 3 3 pA p-p
f = 10 Hz 50 50 fA/√Hz
INPUT VOLTAGE NOISE 0.1 Hz to 10 Hz 0.5 0.5 1.0 µV p-p
f = 10 Hz 17 17 nV/√Hz
f = 1 kHz 15 22 15 22 nV/√Hz
OPEN-LOOP GAIN VO = ± 12 V
R
= 10 kΩ 200 2000 400 2000 V/mV
LOAD
T
MIN
to T
MAX
150 1500 300 1500 V/mV
VO = ±10 V
R
2 kΩ 200 1000 300 1000 V/mV
LOAD =
T
MIN
to T
MAX
150 1000 200 1000 V/mV
OUTPUT CHARACTERISTICS
Voltage Swing R
= 10 kΩ±13 ±14 ±13 ±14 V
LOAD
T
MIN
to T
MAX
±13 ±14 ±13 ±14 V
Current Short Circuit ± 15 ±15 mA
Capacitive Load
Drive Capability Gain = +1 10,000 10,000 pF
–2–
REV. C
AD706
WARNING!
ESD SENSITIVE DEVICE
Parameter Conditions Min Typ Max Min Typ Max Units
AD706J/A AD706K/B
POWER SUPPLY
Rated Performance ± 15 ± 15 V
Operating Range ± 2.0 ±18 ± 2.0 ±18 V
Quiescent Current, Total 0.75 1.2 0.75 1.2 mA
T
MIN
to T
MAX
0.8 1.4 0.8 1.4 mA
TRANSISTOR COUNT # of Transistors 90 90
NOTES
l
Bias current specifications are guaranteed maximum at either input.
2
Input bias current match is the difference between corresponding inputs (IB of –IN of Amplifier #1 minus IB of –IN of Amplifier #2).
CMRR match is the difference between
PSRR match is the difference between
All min and max specifications are guaranteed.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
∆VOS#1
∆V
∆VOS#1
∆V
SUPPLY
for amplifier #1 and
CM
for amplifier #l and
l
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation
(Total: Both Amplifiers)
2
. . . . . . . . . . . . . . . . . . . . 650 mW
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±V
Differential Input Voltage3 . . . . . . . . . . . . . . . . . . . . +0.7 Volts
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Operating Temperature Range
AD706J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD706A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +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; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2
Specification is for device in free air:
8-Lead Plastic Package: θJA = 100°C/Watt
3
The input pins of this amplifier are protected by back-to-back diodes. If the
differential voltage exceeds ±0.7 volts, external series protection resistors should
be added to limit the input current to less than 25 mA.
8-Lead Cerdip Package: θJA = 110°C/Watt
8-Lead Small Outline Package: θJA = 155°C/Watt
∆VOS#2
∆V
CM
∆VOS#2
∆V
SUPPLY
S
for amplifier #2 expressed in dB.
for amplifier #2 expressed in dB.
ORDERING GUIDE
Temperature Package
Model Range Description Option*
AD706AN –40°C to +85°C Plastic DIP N-8
AD706JN 0°C to +70°C Plastic DIP N-8
AD706KN 0°C to +70°C Plastic DIP N-8
AD706JR 0°C to +70°C SOIC R-8
AD706JR-REEL 0°C to +70°C Tape and Reel
AD706AQ –40°C to +85°C Cerdip Q-8
AD706BQ –40°C to +85°C Cerdip Q-8
AD706AR –40°C to +85°C SOIC R-8
AD706AR-REEL – 40°C to +85°C Tape and Reel
*N = Plastic DIP; Q = Cerdip, R = Small Outline Package.
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
Contact factory for latest dimensions.
OUTPUT A
1
8
+V
S
–INPUT A
+INPUT A
–V
2
3
4
S
0.074 (1.88)
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD706 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
REV. C
–3–
0.118 (3.00)
7
6
5
OUTPUT B
–INPUT B
+INPUT B
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