AD712AH Analog Devices, AD712AH Datasheet

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AD712AH

Manufacturer Part Number
AD712AH
Description
Dual Precision/ Low Cost/ High Speed/ BiFET Op Amp
Manufacturer
Analog Devices
Datasheet

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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
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.
FEATURES
Enhanced Replacements for LF412 and TL082
AC PERFORMANCE
Settles to
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-
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
dance with EIA-481A Standard
0.01% in 1.0 ms
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
2. Analog Devices’ advanced processing technology and with
3. Along with precision dc performance, the AD712 offers
4. The AD712 has a guaranteed and tested maximum voltage
5. Analog Devices’ well-matched, ion-implanted JFETs ensure
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
competitive prices.
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.
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.
noise of 4 V p-p, 0.1 Hz to 10 Hz (AD712C).
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.
SOIC (R) Package and Cerdip (Q) Package
High Speed, BiFET Op Amp
NONINVERTING
AMPLIFIER NO. 1
AMPLIFIER NO. 1
NONINVERTING
Dual Precision, Low Cost,
INVERTING
INVERTING
OUTPUT
Plastic Mini-DIP (N) Package
CONNECTION DIAGRAMS
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
World Wide Web Site: http://www.analog.com
V–
1
2
3
4
(H) Package
TO-99
AD712
AD712
+V
–V
S
S
8
7
6
5
AMPLIFIER NO. 2
© Analog Devices, Inc., 1998
AMPLIFIER NO. 2
NONINVERTING
INPUT
OUTPUT
V+
OUTPUT
INVERTING
INPUT
NONINVERTING
INPUT
INVERTING
INPUT
AD712

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AD712AH Summary of contents

Page 1

... Extended reliability PLUS screening is available, specified over the commercial and industrial temperature ranges. PLUS 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 ...

Page 2

AD712–SPECIFICATIONS AD712J/A/S Parameter Min 1 INPUT OFFSET VOLTAGE Initial Offset MIN MAX vs. Temp vs. Supply 76/76/76 MIN MAX Long-Term Offset Stability 2 INPUT BIAS CURRENT ...

Page 3

... C/Watt; JC 8-Lead SOIC Package: = 100 For supply voltages less than 18 V, the absolute maximum input voltage is equal to the supply voltage. REV Model 18 V AD712ACHIPS AD712AH and – AD712AQ AD712BH AD712BQ AD712CH AD712CN AD712JN AD712JR AD712JR-REEL AD712JR-REEL7 AD712KN ...

Page 4

AD712 –Typical Performance Characteristics SUPPLY VOLTAGE Volts Figure 1. Input Voltage Swing vs. Supply Voltage ...

Page 5

GAIN PHASE 100pF LOAD 0 0 –20 –20 10 100 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 10. Open-Loop Gain and Phase Margin vs. Frequency 100 80 ...

Page 6

AD712 –60 –40 – TEMPERATURE – C Figure 19. Slew Rate vs. Temperature +V S 0.1 F 1/2 AD712 0.1 F SQUARE WAVE –V S INPUT Figure 22a. ...

Page 7

OPTIMIZING SETTLING TIME Most bipolar high-speed D/A converters have current outputs; therefore, for most applications, an external op amp is required for current-to-voltage conversion. The settling time of the con- verter/op amp combination depends on the settling time of the ...

Page 8

AD712 OP AMP SETTLING TIME - A MATHEMATICAL MODEL The design of the AD712 gives careful attention to optimizing individual circuit components; in addition, a careful trade-off was made: the gain bandwidth product (4 MHz) and slew rate (20 V/ ...

Page 9

The photos of Figures 28a and 28b show the dynamic response of the AD712 in the settling test circuit of Figure 29. 5V 100 5mV Figure 28a. Settling Characteristics +10 V Step Upper Trace: ...

Page 10

AD712 D/A CONVERTER APPLICATIONS The AD712 is an excellent output amplifier for CMOS DACs. It can be used to perform both 2 quadrant and 4 quadrant op- eration. The output impedance of a DAC using an inverted R-2R ladder approaches ...

Page 11

Figures 33a and 33b show the settling time characteristics of the AD712 when used as a DAC output buffer for the AD7545. 100 Full-Scale Positive Transition 100 Full-Scale Negative Transition Figure 33. ...

Page 12

AD712 PD711 BUFF 100 500mV –10V ADC IN a. Source Current = 2 mA PD711 BUFF 100 500mV –5V ADC IN b. Sink Current = 1 mA Figure 35. ADC Input Unity Gain Buffer ...

Page 13

SECOND ORDER LOW PASS FILTER Figure 38 depicts the AD712 configured as a second order Butterworth low pass filter. With the values as shown, the corner frequency will be 20 kHz; however, the wide bandwidth of the AD712 permits a ...

Page 14

AD712 +15V 0 0.001 F A1 AD711 0.1 F –15V 100k 9-POLE CHEBYCHEV FILTER Figure 40 shows the AD712 and its dual counterpart, the AD711 9-pole Chebychev filter using active frequency dependent negative resistors (FDNR). ...

Page 15

Mini-DIP (N-8) 0.390 (9.91 0.250 0.310 (6.35) (7.87 PIN 1 0.035 0.01 (0.890 0.25) 0.165 0.01 4.19 0.25 0.18 0.01 0.125 (3.18) (4.57 0.76) MIN SEATING 0.033 (0.84) 0.018 0.003 0.100 PLANE (2.54) NOM (0.460 0.081) ...

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