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Dual Precision, Low Cost,
High Speed BiFET Op Amp
AD712
FEATURES
Enhanced replacement for LF412 and TL082
AC performance
Settles to ±0.01% in 1.0 μs
16 V/μs minimum slew rate (AD712J)
3 MHz minimum unity-gain bandwidth (AD712J)
DC performance
200 V/mV minimum open-loop gain (AD712K)
Surface mount available in tape and reel in
accordance with the EIA-481A standard
MIL-STD-883B parts available
Single version available: AD711
Quad version: AD713
Available in PDIP, SOIC_N, and CERDIP packages
CONNECTION DIAGRAM
AMPLIFIER NO. 1
OUTPUT
INVERTING
INPUT
NONINVERTING
INPUT
V–
1
2
3
4
AMPLIFIER NO. 2
8
7
6
5
V+
OUTPUT
INVERTING
INPUT
NONINVERTING
INPUT
00823-001
AD712
Figure 1. 8-Lead PDIP (N-Suffix),
SOIC_N (R-Suffix), and CERDIP (Q-Suffix)
GENERAL 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/μs
and a settling time of 1 μs to ±0.01%, the AD712 is ideal as a
buffer for 12-bit digital-to-analog and analog-to-digital
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 is rated over the industrial tempera-
ture range of −40°C to +85°C. The AD712S is rated over the
military temperature range of −55°C to +125°C and is available
processed to MIL-STD-883B, Rev. C.
Extended reliability PLUS screening is available, specified over
the commercial and industrial temperature ranges. PLUS
screening includes 168-hour burn-in, in addition to other
environmental and physical tests.
The AD712 is available in 8-lead PDIP, SOIC_N, and CERDIP
packages.
PRODUCT HIGHLIGHTS
1. The AD712 offers excellent overall performance at very
competitive prices.
2. The Analog Devices, Inc. advanced processing technology
and 100% testing guarantee a low input offset voltage (3 mV
maximum, J grade). Input offset voltage is specified in the
warmed-up condition.
3. Together with precision dc performance, the AD712 offers
excellent dynamic response. It settles to ±0.01% in 1 μs and
has a minimum slew rate of 16 V/μs. Thus, this device is ideal
for applications such as DAC and ADC buffers that require a
combination of superior ac and dc performance.
Rev. G
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. Specifications subject to change without notice. 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
AD712
TABLE OF CONTENTS
Features .............................................................................................. 1
Connection Diagram ....................................................................... 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
Settling Time ................................................................................... 11
Optimizing Settling Time.......................................................... 11
Op Amp Settling Time—A Mathematical Model.................. 12
Applications Information .............................................................. 14
Guarding...................................................................................... 14
Digital-to-Analog Converter Applications ............................. 14
Noise Characteristics ................................................................. 15
Driving the Analog Input of an
Analog-to-Digital Converter .................................................... 15
Driving a Large Capacitive Load.............................................. 16
Filters................................................................................................ 17
Active Filter Applications.......................................................... 17
Second-Order Low-Pass Filter.................................................. 17
9-Pole Chebychev Filter............................................................. 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 20
REVISION HISTORY
8/06—Rev. F to Rev. G
Edits to Figure 1 ................................................................................ 1
Change to 9-Pole Chebychev Filter Section................................ 18
7/02—Rev. D to Rev. E
Edits to Features.................................................................................1
9/01—Rev. C to Rev. D
6/06—Rev. E to Rev. F
Updated Format..................................................................Universal
Deleted B, C, and T Models...............................................Universal
Changes to General Description .................................................... 1
Changes to Product Highlights....................................................... 1
Changes to Specifications Section.................................................. 3
Changes to Figure 43...................................................................... 15
Edits to Features.................................................................................1
Edits to General Description ...........................................................1
Edits to Connection Diagram..........................................................1
Edits to Ordering Guide ...................................................................3
Deleted Metalization Photograph ...................................................3
Edits to Absolute Maximum Ratings .............................................3
Edits to Figure 7.................................................................................9
Edits to Outline Dimensions......................................................... 15
Rev. G | Page 2 of 20
AD712
SPECIFICATIONS
V
S
= ±15 V @ T
A
= 25°C, unless otherwise noted. 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.
Table 1.
Parameter
INPUT OFFSET VOLTAGE
1
Initial Offset
T
MIN
to T
MAX
vs. Temp
vs. Supply
T
MIN
to T
MAX
Long-Term Offset Stability
INPUT BIAS CURRENT
2
V
CM
= 0 V
V
CM
= 0 V @ T
MAX
V
CM
= ±10 V
INPUT OFFSET CURRENT
V
CM
= 0 V
V
CM
= 0 V @ T
MAX
MATCHING CHARACTERISTICS
Input Offset Voltage
T
MIN
to T
MAX
Input Offset Voltage Drift
Input Bias Current
Crosstalk
@ f = 1 kHz
@ f = 100 kHz
FREQUENCY RESPONSE
Small Signal Bandwidth
Full Power Response
Slew Rate
Settling Time to 0.01%
Total Harmonic Distortion
INPUT IMPEDANCE
Differential
Common Mode
INPUT VOLTAGE RANGE
Differential
3
Common-Mode Voltage
4
T
MIN
to T
MAX
Common-Mode Rejection
Ratio
V
CM
= ±10 V
T
MIN
to T
MAX
V
CM
= ±11 V
T
MIN
to T
MAX
INPUT VOLTAGE NOISE
Min
AD712J/A/S
Typ
0.3
7
95
15
25
0.6/1.6/26
75
1.7/4.8/77
100
25
0.6/1.6/26
3/1/1
4/2/2
20/20/20
25
120
90
3.0
16
4.0
200
20
1.0
0.0003
3×10
12
||5.5
3×10
12
||5.5
±20
+14.5, −11.5
−V
S
+ 4
+V
S
− 2
−V
S
+ 4
3.4
18
1.2
120
90
4.0
200
20
1.0
0.0003
3×10
12
||5.5
3×10
12
||5.5
±20
+14.5, −11.5
+V
S
− 2
Max
3/1/1
4/2/2
20/20/20
80
80
Min
AD712K
Typ
0.2
7
100
15
20
0.5
75
1.7
100
25
0.6
1.0
2.0
10
25
Max
1.0
2.0
10
Unit
mV
mV
μV/°C
dB
dB
μV/month
pA
nA
pA
pA
nA
mV
mV
μV/°C
pA
dB
dB
MHz
kHz
V/μs
μs
%
Ω||pF
Ω||pF
V
V
V
76
76/76/76
10
0.3/0.7/11
5
0.1
1.2
76
76/76/76
70
70/70/70
88
84
84
80
2
45
22
18
16
Rev. G | Page 3 of 20
80
80
76
74
88
84
84
80
2
45
22
18
16
dB
dB
dB
dB
μV p-p
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
AD712
Parameter
INPUT CURRENT NOISE
OPEN-LOOP GAIN
OUTPUT CHARACTERISTICS
Voltage
Current
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
1
2
Min
150
100/100/100
+13, −12.5
±12/±12/±12
AD712J/A/S
Typ
0.01
400
Max
Min
200
100
+13, −12.5
±12
AD712K
Typ
0.01
400
Max
Unit
pA/√Hz
V/mV
V/mV
V
V
mA
V
V
mA
+13.9, −13.3
+13.8, −13.1
+25
±15
+13.9, −13.3
+13.8, −13.1
+25
±15
±4.5
+5.0
±18
+6.8
±4.5
+5.0
±18
+6.0
Input offset voltage specifications are guaranteed after 5 minutes of operation at T
A
= 25°C.
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.
Rev. G | Page 4 of 20
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