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PDF AD712 Data sheet ( Hoja de datos )
| Número de pieza | AD712 | |
| Descripción | High Speed BiFET Dual Op Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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
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 converters (DACs) and analog-
to-digital converters (ADCs) 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.
Precision, Low Cost,
High Speed BiFET Dual Op Amp
AD712
CONNECTION DIAGRAM
AMPLIFIER NO. 1
AMPLIFIER NO. 2
OUTPUT 1
8 V+
INVERTING
INPUT
NONINVERTING
INPUT
2
3
V– 4
AD712
7 OUTPUT
6
INVERTING
INPUT
5
NONINVERTING
INPUT
Figure 1. 8-Lead PDIP (N-Suffix),
SOIC_N (R-Suffix), and CERDIP (Q-Suffix)
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. H
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 ©1986–2010 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Internal Power Dissipation1
Input Voltage2
Output Short-Circuit Duration
Differential Input Voltage
Storage Temperature Range
Q-Suffix
N-Suffix and R-Suffix
Operating Temperature Range
AD712J/K
AD712A
AD712S
Lead Temperature Range (Soldering 60 sec)
Rating
±18 V
±18 V
Indefinite
+VS and −VS
−65°C to +150°C
−65°C to +125°C
0°C to 70°C
−40°C to +85°C
−55°C to +125°C
300°C
1 Thermal characteristics:
8-lead PDIP package:
8-lead CERDIP package:
8-lead SOIC package:
θJA = 165°C/W
θJC = 22°C/W; θJA = 110°C/W
θJA = 100°C/W
2 For supply voltages less than ±18 V, the absolute maximum voltage is equal
to the supply voltage.
AD712
Stresses above those listed under Absolute Maximum Ratings
may cause permanent 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.
ESD CAUTION
Rev. H | Page 5 of 20
5 Page 
AD712
SETTLING TIME
OPTIMIZING SETTLING TIME
Most bipolar high speed DACs have current outputs; therefore,
for most applications, an external op amp is required for a current-
to-voltage conversion. The settling time of the converter/op amp
combination depends on the settling time of the DAC and output
amplifier. A good approximation is
( ) ( )tS Total = tS DAC 2 + tS AMP 2
The settling time of an op amp DAC buffer varies with the noise
gain of the circuit, the DAC output capacitance, and the amount
of external compensation capacitance across the DAC output
scaling resistor.
Settling time for a bipolar DAC is typically 100 ns to 500 ns.
Previously, conventional op amps have required much longer
settling times than have typical state-of-the-art DACs; therefore,
the amplifier settling time has been the major limitation to a high
speed, voltage output, digital-to-analog function. The introduction
of the AD71x family of op amps with their 1 μs (to ±0.01% of
final value) settling time permits the full high speed capabilities
of most modern DACs to be realized.
In addition to a significant improvement in settling time, the
low offset voltage, low offset voltage drift, and high open-loop
gain of the AD71x family assure 12-bit accuracy over the full
operating temperature range.
The excellent high speed performance of the AD712 is shown in
the oscilloscope photos in Figure 29 and Figure 30. Measurements
were taken using a low input capacitance amplifier connected
directly to the summing junction of the AD712, and both figures
show a worst-case situation: full-scale input transition. The 4 kΩ
[10 kΩ||8 kΩ = 4.4 kΩ] output impedance of the DAC, together
with a 10 kΩ feedback resistor, produce an op amp noise gain of
3.25. The current output from the DAC produces a 10 V step at
the op amp output (0 to −10 V shown in Figure 29, and −10 V to
0 V shown in Figure 30).
0.1µF
Therefore, with an ideal op amp, settling to ±1/2 LSB (±0.01%)
requires that 375 μV or less appears at the summing junction.
This means that the error between the input and output (that
voltage which appears at the AD712 summing junction) must
be less than 375 μV. As shown in Figure 29, the total settling
time for the AD712/AD565A combination is 1.2 microseconds.
1mV
5V
100
90
SUMMING
JUNCTION
0V
10
0%
–10V
OUTPUT
500ns
Figure 29. Settling Characteristics for AD712 with AD565A,
Full-Scale Negative Transition
1mV
5V
100
90
SUMMING
JUNCTION
0V
10
0%
–10V
OUTPUT
500ns
Figure 30. Settling Characteristics for AD712 with AD565A,
Full-Scale Positive Transition
R2
GAIN 100Ω
ADJUST
REF
IN
REF
OUT
+
10V
–
19.95kΩ
REF
GND
20kΩ
BIPOLAR
OFFSET ADJUST
VCC
R1
100Ω
BIPOLAR
OFF
20V
SPAN
AD565A
9.95kΩ
0.5mA
IREF
DAC
IOUT = 4 ×
IREF × CODE
IO
5kΩ
10V
SPAN
5kΩ DAC
OUT
8kΩ
10pF +15V
0.1µF
–8
1/2
AD712
+
4 0.1µF
OUTPUT
–10V TO +10V
–VEE
0.1µF
POWER
GND
MSB
LSB
–15V
Figure 31. ±10 V Voltage Output Bipolar DAC
Rev. H | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD712.PDF ] | |
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