ANALOG DEVICES AD712-EP Service Manual
Dual Precision, Low Cost,
A
G
FEATURES
Supports defense and aerospace applications (AQEC
standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
Enhanced replacement for LF412 and TL082
AC performance
Settles to ±0.01% in 1.0 μs
16 V/μs minimum slew rate
3 MHz minimum unity-gain bandwidth
DC performance
150 V/mV minimum open-loop gain
Available in a SOIC_N package
GENERAL DESCRIPTION
The AD712-EP is a high speed, precision, monolithic
operational amplifier offering high performance over the
military temperature range of −55°C to +125°C. Its 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 BiFET or 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-EP is ideal as a
buffer for 12-bit digital-to-analog converters (DACs) and 12-bit
analog-to-digital converters (ADCs) and as a high speed
integrator.
High Speed BiFET Op Amp
AD712-EP
CONNECTION DIAGRAM
MPLIFIER NO. 1
OUTPUT
INVERTING
NONINVERTIN
1
2
INPUT
3
INPUT
V–
4
AD712-EP
Figure 1. 8-Lead SOIC_N (R-Suffix)
The combination of excellent noise performance and low input
current also make the AD712-EP useful for photodiode preamps.
Common-mode rejection of 88 dB and open-loop gain of
400 V/mV ensure 12-bit performance even in high speed unitygain buffer circuits.
The AD712-EP is available in an 8-lead SOIC_N package.
Additional applications information is available in the AD712
data sheet.
AMPLIFIER NO. 2
8
V+
OUTPUT
7
INVERTING
6
INPUT
NONINVERTING
5
INPUT
09285-001
Rev. 0
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.
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Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved.
AD712-EP
TABLE OF CONTENTS
Features .............................................................................................. 1
Connection Diagram ....................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
REVISION HISTORY
8/10—Revision 0: Initial Version
Absolute Maximum Ratings ............................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
Rev. 0 | Page 2 of 12
AD712-EP
SPECIFICATIONS
VS = ±15 V @ TA = 25°C, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit
INPUT OFFSET VOLTAGE1
Initial Offset 0.3 3 mV
T
to T
MIN
vs. Temperature 7 20 V/°C
vs. Supply 76 95 dB
T
Long-Term Offset Stability 15 µV/month
INPUT BIAS CURRENT2
VCM = 0 V 25 75 pA
VCM = 0 V @ T
VCM = ±10 V 100 pA
INPUT OFFSET CURRENT
VCM = 0 V 10 25 pA
VCM = 0 V @ T
MATCHING CHARACTERISTICS
Input Offset Voltage 3 mV
T
MIN
Input Offset Voltage Drift 20 µV/°C
Input Bias Current 25 pA
Crosstalk
At f = 1 kHz 120 dB
At f = 100 kHz 90 dB
FREQUENCY RESPONSE
Small Signal Bandwidth 3.0 4.0 MHz
Full Power Response 200 kHz
Slew Rate 16 20 V/µs
Settling Time to 0.01% 1.0 1.2 µs
Total Harmonic Distortion 0.0003 %
INPUT IMPEDANCE
Differential 3 × 1012||5.5 Ω||pF
Common Mode 3 × 1012||5.5 Ω||pF
INPUT VOLTAGE RANGE
Differential3 ±20 V
Common-Mode Voltage4 +14.5, −11.5 V
T
MIN
Common-Mode Rejection Ratio
VCM = ±10 V 76 88 dB
T
VCM = ±11 V 70 84 dB
T
INPUT VOLTAGE NOISE
0.1 Hz to 10 Hz 2 µV p-p
f = 10 Hz 45 nV/√Hz
f = 100 Hz 22 nV/√Hz
f = 1 kHz 18 nV/√Hz
f = 10 kHz 16 nV/√Hz
INPUT CURRENT NOISE
f = 1 kHz 0.01 pA/√Hz
4 mV
MAX
to T
MIN
to T
to T
MIN
MIN
76 dB
MAX
26 77 nA
MAX
11 26 nA
MAX
4 mV
MAX
−VS + 4 +VS − 2 V
MAX
to T
76 84 dB
MAX
to T
70 80 dB
MAX
Rev. 0 | Page 3 of 12
AD712-EP
Parameter Min Typ Max Unit
OPEN-LOOP GAIN 150 V/mV
T
to T
MIN
OUTPUT CHARACTERISTICS
Output Voltage Swing High 13.9 13.0 V
T
Output Voltage Swing Low −12.5 −13.1 V
T
Current 25 mA
POWER SUPPLY
Rated Performance ±15 V
Operating Range ±4.5 ±18 V
Quiescent Current 5.0 6.8 mA
1
Input offset voltage specifications are guaranteed after 5 minutes of operation at TA = 25°C.
2
Bias current specifications are guaranteed maximum at either input after 5 minutes of operation at TA = 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.
100 V/mV
MAX
to T
MIN
MIN
12.0 V
MAX
to T
−12.0 V
MAX
Rev. 0 | Page 4 of 12
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