Analog Devices AD705TQ-883B, AD705TQ, AD705KN, AD705JR-REEL7, AD705JR-REEL Datasheet
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Picoampere Input Current
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AD705
a
FEATURES
DC PERFORMANCE
25 mV max Offset Voltage (AD705T)
0.6 mV/8C max Drift (AD705K/T)
100 pA max Input Bias Current (AD705K)
600 pA max I
114 dB min CMRR (AD705K/T)
114 dB min PSRR (AD705T)
200 V/mV min Open Loop Gain
0.5 mV p-p typ Noise, 0.1 Hz to 10 Hz
600 mA max Supply Current
AC PERFORMANCE
0.15 V/µs Slew Rate
800 kHz Unity Gain Crossover Frequency
10,000 pF Capacitive Load Drive Capability
Low Cost
Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip
and Surface Mount (SOIC) Packages
MIL-STD-883B Processing Available
Dual Version Available: AD706
Quad Version: AD704
APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
PRODUCT DESCRIPTION
The AD705 is a low power bipolar op amp that has the low input bias current of a BiFET amplifier but which offers a significantly lower I
of the advantages of BiFET and bipolar op amps without their
inherent disadvantages. It utilizes superbeta bipolar input transistors to achieve the picoampere input bias current levels of
FET input amplifiers (at room temperature), while its I
cally only increases 5 times vs. BiFET amplifiers which exhibit a
1000X increase over temperature. This means that, at room
temperature, while a typical BiFET may have less I
AD705, the BiFET’s input current will increase to a level of
several nA at +125°C. Superbeta bipolar technology also permits the AD705 to achieve the microvolt offset voltage and low
noise characteristics of a precision bipolar input amplifier.
The AD705 is a high quality replacement for the industrystandard OP07 amplifier while drawing only one sixth of its
power supply current. Since it has only 1/20th the input bias
current of an OP07, the AD705 can be used with much higher
source impedances, while providing the same level of dc precision. In addition, since the input bias currents are at picoAmp
Over MIL Temperature Range (AD705T)
B
drift over temperature. The AD705 offers many
B
typi-
B
than the
B
Bipolar Op Amp
AD705
CONNECTION DIAGRAM
Plastic Mini-DIP (N)
Cerdip (Q) and
Plastic SOIC (R) Packages
levels, the commonly used “balancing” resistor (connected between the noninverting input of a bipolar op amp and ground) is
not required.
The AD705 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 AD705 is internally compensated for unity gain and is
available in five performance grades. The AD705J and AD705K
are rated over the commercial temperature range of 0°C to
+70°C. The AD705A and AD705B are rated over the industrial
temperature range of –40°C to +85°C. The AD705T is rated
over the military temperature range of –55°C to +125°C and is
available processed to MIL-STD-883B, Rev. C.
The AD705 is offered in three varieties of 8-pin package: plastic
DIP, hermetic cerdip and surface mount (SOIC). “J” grade
chips are also available.
PRODUCT HIGHLIGHTS
1. The AD705 is a low drift op amp that offers BiFET level
input bias currents, yet has the low I
fier. It upgrades the performance of circuits using op amps
such as the LT1012.
2. The combination of Analog Devices’ advanced superbeta
processing technology and factory trimming provides both
low drift and high dc precision.
3. The AD705 can be used in applications where a chopper amplifier would normally be required but without the chopper’s
inherent noise and other problems.
drift of a bipolar ampli-
B
REV. B
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: 617/329-4700 Fax: 617/326-8703
AD705–SPECIFICATIONS
(@ TA = +258C, VCM = 0 V, and VS = 615 V dc, unless otherwise noted)
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units
AD705J/A AD705K/B AD705T
INPUT OFFSET VOLTAGE
Initial Offset 30 90 10 35 10 25 µV
Offset T
vs. Temp, Average TC 0.2 1.2 0.2 0.6 0.2 0.6 µV/°C
MIN
to T
MAX
45 150 25 60 25 60 µV
vs. Supply (PSRR) VS = ±2 V to ±18 V 110 129 110 129 114 129 dB
T
to T
MIN
Long Term Stability 0.3 0.3 0.3 µV/month
INPUT BIAS CURRENT
MAX
1
VS = ±2.5 V to ±18 V 108 126 108 126 108 126 dB
VCM = 0 V 60 150 30 100 30 100 pA
VCM = ±13.5 V 80 200 50 150 50 150 pA
vs. Temp, Average TC 0.3 0.3 0.6 pA/°C
T
MIN
T
MIN
to T
to T
MAX
MAX
VCM = 0 V 80 250 50 150 90 600 pA
VCM = ± 13.5 V 100 450 70 350 120 750 pA
INPUT OFFSET CURRENT VCM = 0 V 40 150 30 100 30 100 pA
VCM = ±13.5 V 40 200 30 150 30 150 pA
vs. Temp, Average TC 0.3 0.3 0.4 pA/°C
T
to T
MIN
MIN
to T
MAX
MAX
T
VCM = 0 V 80 250 50 150 80 250 pA
VCM = ±13.5 V 80 450 50 350 80 450 pA
FREQUENCY RESPONSE
Unity Gain
Crossover Frequency 0.4 0.8 0.4 0.8 0.4 0.8 MHz
Slew Rate, Unity Gain G = –1 0.1 0.15 0.1 0.15 0.1 0.15 V/µs
Slew Rate T
MIN
to T
MAX
0.05 0.15 0.05 0.15 0.05 0.15 V/µs
INPUT IMPEDANCE
Differential 40i2 40i240i2MΩipF
Common Mode 300i2 300i2 300i2GΩipF
INPUT VOLTAGE RANGE
Common-Mode Voltage ± 13.5 ± 14 ±13.5 ± 14 ± 13.5 ± 14 V
COMMON-MODE
REJECTION RATIO VCM = ±13.5 V 110 132 114 132 114 132 dB
T
MIN
to T
MAX
108 128 108 128 108 128 dB
INPUT VOLTAGE NOISE 0.1 Hz to 10 Hz 0.5 0.5 1.0 0.5 1.0 µV p-p
f = 10 Hz 17 17 17 nV/√Hz
f = 1 kHz 15 22 15 22 15 22 nV/√Hz
INPUT CURRENT NOISE f = 10 Hz 50 50 50 fA/√Hz
OPEN-LOOP GAIN VO = ±12 V
R
= 10 kΩ 300 2000 400 2000 400 2000 V/mV
LOAD
T
to T
MIN
VO = ±10 V
R
T
MAX
= 2 kΩ 200 1000 300 1000 300 1000 V/mV
LOAD
to T
MIN
MAX
200 1500 300 1500 300 1500 V/mV
150 1000 200 1000 200 1000 V/mV
OUTPUT CHARACTERISTICS
Voltage Swing R
Current Short Circuit ±15 ± 15 ±15 mA
= 10 kΩ±13 ±14 ± 13 ±14 ±13 ±14 V
LOAD
T
MIN
to T
MAX
613 ±14 613 ±14 613 ±14 V
Capacitive Load
Drive Capability Gain = +1 10,000 10,000 10,000 pF
Output Resistance Open Loop 200 200 200 Ω
POWER SUPPLY
Rated Performance ±15 ± 15 ±15 V
Operating Range 62.0 618 62.0 618 62.0 618 V
Quiescent Current 380 600 380 600 380 600 µA
T
MIN
to T
MAX
400 800 400 800 400 800 µA
TEMPERATURE RANGE
FOR RATED PERFORMANCE
Commercial (0°C to +70°C) AD705J AD705K
Industrial (–40°C to +85°C) AD705A AD705B
Military (–55°C to +125°C) AD705T
–2–
REV. B
AD705
WARNING!
ESD SENSITIVE DEVICE
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units
AD705J/A AD705K/B AD705T
PACKAGE OPTIONS
8-Pin Cerdip (Q-8) AD705AQ AD705BQ AD705TQ
8-Pin Plastic Mini-DIP (N-8) AD705JN AD705KN
8-Pin SOIC (R-8) AD705JR
Chips AD705JCHIPS
TRANSISTOR COUNT # of Transistors 45 45 45
NOTES
1
Bias current specifications are guaranteed maximum at either input.
All min and max specifications are guaranteed
Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels.
Specifications subject to change without notice.
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
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0.074 (1.88)
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V
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5 OVER COMP
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±V
Differential Input Voltage
2
. . . . . . . . . . . . . . . . . . . 650 mW
3
. . . . . . . . . . . . . . . . . . . . . ±0.7 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C
Storage Temperature Range (Q) . . . . . . . . . –65°C to +150°C
Operating Temperature Range
1
AD705J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
0.0677
(1.72)
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2
3
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4 –V
S
AD705A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD705T . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and 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-Pin Plastic Package: θJA = 165°C/Watt
8-Pin Cerdip Package: θJA = 110°C/Watt
8-Pin Small Outline Package: θJA = 155°C/Watt
3
The input pins of these amplifiers are protected by back-to-back diodes. If the
differential voltage exceeds ±0.7 V, external series protection resistors should be
added to limit the input current to less than 25 mA.
S
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 AD705 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. B
ORDERING GUIDE
Temperature Package Package
Model Range Description Option
AD705AQ –40°C to +85°C 8-Pin Ceramic DIP Q-8
AD705BQ –40°C to +85°C 8-Pin Ceramic DIP Q-8
AD705JCHIPS 0°C to +70°C Bare Die
AD705JN 0°C to +70°C 8-Pin Plastic DIP N-8
AD705JR 0°C to +70°C 8-Pin Plastic SOIC R-8
AD705JR-REEL 0°C to +70°C 8-Pin Plastic SOIC R-8
AD705JR-REEL7 0°C to +70°C 8-Pin Plastic SOIC R-8
AD705KN 0°C to +70°C 8-Pin Plastic DIP N-8
AD705TQ –55°C to +125° C 8-Pin Ceramic DIP Q-8
AD705TQ/883B –55°C to +125°C 8-Pin Ceramic DIP Q-8
–3–
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