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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.
a
AD712
CONNECTION DIAGRAMS
TO-99
(H) Package
OUTPUT
INVERTING
OUTPUT
NONINVERTING
OUTPUT
OUTPUT
INVERTING
INPUT
NONINVERTING
INPUT
V
S
+V
S
AMPLIFIER NO. 2
AMPLIFIER NO. 1
AD712
Plastic Mini-DIP (N) Package
SOIC (R) Package and Cerdip (Q) Package
8
7
6
5
1
2
3
4
OUTPUT
INVERTING
OUTPUT
NONINVERTING
OUTPUT
V+
OUTPUT
INVERTING
INPUT
NONINVERTING
INPUT
V
AD712
AMPLIFIER NO. 2
AMPLIFIER NO. 1
FEATURES
Enhanced Replacements for LF412 and TL082
AC PERFORMANCE
Settles to 0.01% in 1.0 ms
16 V/ s min Slew Rate (AD712J)
3 MHz min Unity Gain Bandwidth (AD712J)
DC PERFORMANCE
0.30 mV max Offset Voltage: (AD712C)
5 V/ C max Drift: (AD712C)
200 V/mV min Open-Loop Gain (AD712K)
4 V p-p max Noise, 0.1 Hz to 10 Hz (AD712C)
Surface Mount Available in Tape and Reel in Accor-
dance with EIA-481A Standard
MIL-STD-883B Parts Available
Single Version Available: AD711
Quad Version: AD713
Available in Plastic Mini-DIP, Plastic SOIC, Hermetic
Cerdip, Hermetic Metal Can Packages and Chip Form
Dual Precision, Low Cost,
High Speed, BiFET Op Amp
PRODUCT DESCRIPTION
The AD712 is a high speed, precision monolithic operational
amplifier offering high performance at very modest prices. Its
very low offset voltage and offset voltage drift are the results of
advanced laser wafer trimming technology. These performance
benefits allow the user to easily upgrade existing designs that use
older precision BiFETs and, in many cases, bipolar op amps.
The superior ac and dc performance of this op amp makes it
suitable for active filter applications. With a slew rate of 16 V/
s
and a settling time of 1
s to
0.01%, the AD712 is ideal as a
buffer for 12-bit D/A and A/D Converters and as a high-speed
integrator. The settling time is unmatched by any similar IC
amplifier.
The combination of excellent noise performance and low input
current also make the AD712 useful for photo diode preamps.
Common-mode rejection of 88 dB and open loop gain of
400 V/mV ensure 12-bit performance even in high-speed unity
gain buffer circuits.
The AD712 is pinned out in a standard op amp configuration
and is available in seven performance grades. The AD712J and
AD712K are rated over the commercial temperature range of
0
C to +70
C. The AD712A, AD712B and AD712C are rated
over the industrial temperature range of 40
C to +85
C. The
AD712S and AD712T are rated over the military temperature
range of 55
C to +125
C and are available processed to MIL-
STD-883-B, Rev. C.
Extended reliability PLUS screening is available, specified over
the commercial and industrial temperature ranges. PLUS
screening includes 168-hour burn-in, as well as other environ-
mental and physical tests.
The AD712 is available in an 8-lead plastic mini-DIP, SOIC,
cerdip, TO-99 metal can, or in chip form.
PRODUCT HIGHLIGHTS
1. The AD712 offers excellent overall performance at very
competitive prices.
2. Analog Devices' advanced processing technology and with
100% testing guarantees a low input offset voltage (0.3 mV
max, C grade, 3 mV max, J grade). Input offset voltage is
specified in the warmed-up condition. Analog Devices' laser
wafer drift trimming process reduces input offset voltage
drifts to 5
V/
C max on the AD712C.
3. Along with precision dc performance, the AD712 offers
excellent dynamic response. It settles to
0.01% in 1
s and
has a minimum slew rate of 16 V/
s. Thus this device is ideal
for applications such as DAC and ADC buffers which re-
quire a combination of superior ac and dc performance.
4. The AD712 has a guaranteed and tested maximum voltage
noise of 4
V p-p, 0.1 Hz to 10 Hz (AD712C).
5. Analog Devices' well-matched, ion-implanted JFETs ensure
a guaranteed input bias current (at either input) of 50 pA
max (AD712C) and an input offset current of 10 pA max
(AD712C). Both input bias current and input offset current
are guaranteed in the warmed-up condition.
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., 1998
AD712J/A/S
AD712K/B/T
AD712C
Parameter
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
INPUT OFFSET VOLTAGE
1
Initial Offset
0.3
3/1/1
0.2
1.0/0.7/0.7
0.1
0.3
mV
T
MIN
to T
MAX
4/2/2
2.0/1.5/1.5
0.6
mV
vs. Temp
7
20/20/20
7
10
3
5
V/
C
vs. Supply
76
95
80
100
86
110
dB
T
MIN
to T
MAX
76/76/76
80
86
dB
Long-Term Offset Stability
15
15
15
V/Month
INPUT BIAS CURRENT
2
V
CM
= 0 V
25
75
20
75
20
50
pA
V
CM
= 0 V @ T
MAX
0.6/1.6/26
1.7/4.8/77
0.5/1.3/20
1.7/4.8/77
1.3
3.2
nA
V
CM
=
10 V
100
100
75
pA
INPUT OFFSET CURRENT
V
CM
= 0 V
10
25
5
25
5
10
pA
V
CM
= 0 V @ T
MAX
0.3/0.7/11
0.6/1.6/26
0.1/0.3/5
0.6/1.6/26
0.3
0.7
nA
MATCHING CHARACTERISTICS
Input Offset Voltage
3/1/1
1.0/0.7/0.7
0.3
mV
T
MIN
to T
MAX
4/2/2
2.0/1.5/1.5
0.6
mV
Input Offset Voltage Drift
20/20/20
10
5
V/
C
Input Bias Current
25
25
10
pA
Crosstalk @ f = 1 kHz
120
120
120
dB
@ f = 100 kHz
90
90
90
dB
FREQUENCY RESPONSE
Small Signal Bandwidth
3.0
4.0
3.4
4.0
3.4
4.0
MHz
Full Power Response
200
200
200
kHz
Slew Rate
16
20
18
20
18
20
V/
s
Settling Time to 0.01%
1.0
1.2
1.0
1.2
1.0
1.2
s
Total Harmonic Distortion
0.0003
0.0003
0.0003
%
INPUT IMPEDANCE
Differential
3
10
12
5.5
3
10
12
5.5
3
10
12
5.5
pF
Common Mode
3
10
12
5.5
3
10
12
5.5
3
10
12
5.5
pF
INPUT VOLTAGE RANGE
Differential
3
20
20
20
V
Common-Mode Voltage
4
+14.5, 11.5
+14.5, 11.5
+14.5, 11.5
T
MIN
to T
MAX
V
S
+ 4
+V
S
2
V
S
+ 4
+V
S
2
V
S
+ 4
+V
S
2 V
Common-Mode
Rejection Ratio
V
CM
=
10 V
76
88
80
88
86
94
dB
T
MIN
to T
MAX
76/76/76
84
80
84
86
90
dB
V
CM
=
11 V
70
84
76
84
76
90
dB
T
MIN
to T
MAX
70/70/70
80
74
80
74
84
dB
INPUT VOLTAGE NOISE
2
2
2
V p-p
45
45
45
nV/
Hz
22
22
22
nV/
Hz
18
18
18
nV/
Hz
16
16
16
nV/
Hz
INPUT CURRENT NOISE
0.01
0.01
0.01
pA/
Hz
OPEN-LOOP GAIN
150
400
200
400
200
400
V/mV
100/100/100
100
100
V/mV
OUTPUT CHARACTERISTICS
Voltage
+13, 12.5
+13.9, 13.3
+13, 12.5 +13.9, 13.3
+13, 12.5 +13.9, 13.3
V
12/
12/ 12 +13.8, 13.1
12
+13.8, 13.1
12
+13.8, 13.1
V
Current
25
25
25
mA
POWER SUPPLY
Rated Performance
15
15
15
V
Operating Range
4.5
18
4.5
18
4.5
18
V
Quiescent Current
5.0
6.8
5.0
6.0
5.0
5.6
mA
NOTES
1
Input Offset Voltage specifications are guaranteed after 5 minutes of operation at T
A
= +25
C.
2
Bias Current specifications are guaranteed maximum at either input after 5 minutes of operation at T
A
= +25
C. For higher temperatures, the current doubles every 10
C.
3
Defined as voltage between inputs, such that neither exceeds
10 V from ground.
4
Typically exceeding 14.1 V negative common-mode voltage on either input results in an output phase reversal.
Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max
specifications are guaranteed, although only those shown in boldface are tested on all production units.
Specifications subject to change without notice.
AD712SPECIFICATIONS
REV. B
2
(V
S
= 15 V @ T
A
= +25 C unless otherwise noted)
AD712
REV. B
3
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V
Internal Power Dissipation
2
Input Voltage
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
S
and V
S
Storage Temperature Range (Q, H) . . . . . . . 65
C to +150
C
Storage Temperature Range (N, R) . . . . . . . . 65
C to +125
C
Operating Temperature Range
AD712J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
C to +70
C
AD712A/B/C . . . . . . . . . . . . . . . . . . . . . . . . 40
C to +85
C
AD712S/T . . . . . . . . . . . . . . . . . . . . . . . . . 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 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
Thermal Characteristics:
8-Lead Plastic Package:
JA
= 165
C/Watt
8-Lead Cerdip Package:
JC
= 22
C/Watt;
JA
= 110
C/Watt
8-Lead Metal Can Package:
JC
= 65
C/Watt;
JA
= 150
C/Watt
8-Lead SOIC Package:
JA
= 100
C
3
For supply voltages less than
18 V, the absolute maximum input voltage is equal
to the supply voltage.
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Description
Option
AD712ACHIPS
40
C to +85
C
Bare Die
AD712AH
40
C to +85
C
8-Lead Metal Can
H-08A
AD712AQ
40
C to +85
C
8-Lead Ceramic DIP
Q-8
AD712BH
40
C to +85
C
8-Lead Metal Can
H-08A
AD712BQ
40
C to +85
C
8-Lead Ceramic DIP
Q-8
AD712CH
40
C to +85
C
8-Lead Metal Can
H-08A
AD712CN
40
C to +85
C
8-Lead Plastic DIP
N-8
AD712JN
0
C to +70
C
8-Lead Plastic DIP
N-8
AD712JR
0
C to +70
C
8-Lead Plastic SOIC
R-8
AD712JR-REEL
0
C to +70
C
8-Lead Plastic SOIC
R-8
AD712JR-REEL7
0
C to +70
C
8-Lead Plastic SOIC
R-8
AD712KN
0
C to +70
C
8-Lead Plastic DIP
N-8
AD712KR
0
C to +70
C
8-Lead Plastic SOIC
R-8
AD712KR-REEL
0
C to +70
C
8-Lead Plastic SOIC
R-8
AD712KR-REEL7
0
C to +70
C
8-Lead Plastic SOIC
R-8
AD712SCHIPS
55
C to +125
C
Bare Die
AD712SQ
55
C to +125
C
8-Lead Ceramic DIP
Q-8
AD712SQ/883B
55
C to +125
C
8-Lead Ceramic DIP
Q-8
AD712TQ
55
C to +125
C
8-Lead Ceramic DIP
Q-8
AD712TQ/883B
55
C to +125
C
8-Lead Ceramic DIP
Q-8
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
Contact factory for latest dimensions.
AD712
REV. B
4
SUPPLY VOLTAGE Volts
INPUT VOLTAGE SWING Volts
20
15
0
0
5
20
10
15
10
5
R
L
= 2k
25 C
Figure 1. Input Voltage Swing vs.
Supply Voltage
SUPPLY VOLTAGE Volts
QUIESCENT CURRENT mA
6
5
2
0
5
20
10
15
4
3
Figure 4. Quiescent Current vs.
Supply Voltage
COMMON MODE VOLTAGE Volts
INPUT BIAS CURRENT pA
100
75
0
5
10
0
5
50
25
V
S
= +15V
25 C
10
MAX J GRADE LIMIT
Figure 7. Input Bias Current vs.
Common Mode Voltage
Typical Performance Characteristics
SUPPLY VOLTAGE Volts
OUTPUT VOLTAGE SWING Volts
20
15
0
0
5
20
10
15
10
5
R
L
= 2k
25 C
+V
OUT
V
OUT
Figure 2. Output Voltage Swing vs.
Supply Voltage
TEMPERATURE C
INPUT BIAS CURRENT (V
CM
= 0) Amps
10
12
60
0
140
40 40
20
120
40
60
80 100
10
11
10
10
10
9
10
8
10
7
10
6
Figure 5. Input Bias Current vs.
Temperature
AMBIENT TEMPERATURE C
SHORT CIRCUIT CURRENT LIMIT mA
10
60
+ OUTPUT CURRENT
OUTPUT CURRENT
40 20
0
20
40
60
80 100 120 140
12
14
16
18
20
22
24
26
Figure 8. Short Circuit Current
Limit vs. Temperature
LOAD RESISTANCE
OUTPUT VOLTAGE SWING Volts pp
30
25
0
10
100
10k
1k
15
10
5
20
15V SUPPLIES
Figure 3. Output Voltage Swing
vs. Load Resistance
FREQUENCY Hz
OUTPUT IMPEDANCE
0.01
1k
1.0
0.1
10
100
10k
100k
1M
10M
Figure 6. Output Impedance vs.
Frequency
TEMPERATURE C
UNITY GAIN BANDWIDTH MHz
3.0
60 40 20
0
20
40
60
80 100 120 140
3.5
4.0
4.5
5.0
Figure 9. Unity Gain Bandwidth vs.
Temperature
AD712
REV. B
5
FREQUENCY Hz
OPEN LOOP GAIN dB
20
100
1k
1M
10
10k
100k
10M
0
20
40
60
80
100
GAIN
PHASE
2k
100pF
LOAD
20
0
20
40
60
80
100
PHASE MARGIN
C
Figure 10. Open-Loop Gain and
Phase Margin vs. Frequency
FREQUENCY Hz
CMR dB
0
10
100
80
60
40
20
100
1k
10k
100k
1M
V
S
= 15V
V
CM
= 1Vp-p
25 C
Figure 13. Common Mode Rejec-
tion vs. Frequency
FREQUENCY Hz
THD dB
70
100
10k
1k
80
90
100
110
120
130
100k
3V RMS
R
L
= 2k
C
L
= 100pF
Figure 16. Total Harmonic Distor-
tion vs. Frequency
SUPPLY VOLTAGE Volts
OPEN LOOP GAIN dB
125
0
5
20
10
15
R
L
= 2k
25 C
120
115
110
105
100
95
Figure 11. Open-Loop Gain vs.
Supply Voltage
INPUT FREQUENCY Hz
OUTPUT VOLTAGE Volts pp
30
25
0
100k
10M
1M
15
10
5
20
R
L
= 2k
25 C
V
S
= 15V
Figure 14. Large Signal Frequency
Response
FREQUENCY Hz
INPUT NOISE VOLTAGE nV/
Hz
1k
1
10
100
10k
100k
100
10
1
1k
Figure 17. Input Noise Voltage
Spectral Density
SUPPLY MODULATION FREQUENCY Hz
POWER SUPPLY REJECTION dB
110
0
10
100
80
60
40
20
100
1k
10k
100k
1M
SUPPLY
+ SUPPLY
V
S
= 15V SUPPLIES
WITH 1V p-p SINE
WAVE 25 C
Figure 12. Power Supply Rejection
vs. Frequency
SETTLING TIME s
OUTPUT SWING FROM 0V TO
VOLTS
8
0.5
6
4
2
0
4
6
8
10
2
10
0.6
0.7
0.8
0.9
1.0
0.01%
0.1%
1%
0.01%
0.1%
1%
ERROR
Figure 15. Output Swing and Error
vs. Settling Time
INPUT ERROR SIGNAL mV
(AT SUMMING JUNCTION)
SLEW RATE V/
s
5
100
10
15
20
25
200 300 400 500 600 700 800 900
0
0
Figure 18. Slew Rate vs. Input
Error Signal