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PDF AD706 Data sheet ( Hoja de datos )
| Número de pieza | AD706 | |
| Descripción | Dual Picoampere Input Current Bipolar Op Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD706 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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a
Dual Picoampere Input
Current Bipolar Op Amp
AD706
FEATURE
HIGH DC PRECISION
50 V max Offset Voltage
0.6 V/؇C max Offset Drift
110 pA max Input Bias Current
LOW NOISE
0.5 V p-p Voltage Noise, 0.1 Hz to 10 Hz
LOW POWER
750 A Supply Current
Available in 8-Lead Plastic Mini-DlP, Hermetic Cerdip
and Surface Mount (SOIC) Packages
Available in Tape and Reel in Accordance with
EIA-481A Standard
Single Version: AD705, Quad Version: AD704
PRIMARY APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
PRODUCT DESCRIPTION
The AD706 is a dual, low power, bipolar op amp that has the
low input bias current of a BiFET amplifier, but which offers a
significantly lower IB drift over temperature. It utilizes superbeta
bipolar input transistors to achieve picoampere input bias cur-
rent levels (similar to FET input amplifiers at room tempera-
ture), while its IB typically only increases by 5× at 125°C (unlike
a BiFET amp, for which IB doubles every 10°C for a 1000×
increase at 125°C). The AD706 also achieves the microvolt
offset voltage and low noise characteristics of a precision bipolar
input amplifier.
Since it has only 1/20 the input bias current of an OP07, the
AD706 does not require the commonly used “balancing” resis-
tor. Furthermore, the current noise is 1/5 that of the OP07,
which makes this amplifier usable with much higher source
impedances. At 1/6 the supply current (per amplifier) of the
OP07, the AD706 is better suited for today’s higher density
boards.
The AD706 is an excellent choice for use in low frequency
active filters in 12- and 14-bit data acquisition systems, in preci-
sion instrumentation and as a high quality integrator. The
AD706 is internally compensated for unity gain and is available
in five performance grades. The AD706J and AD706K are rated
over the commercial temperature range of 0°C to +70°C. The
AD706A and AD706B are rated over the industrial temperature
range of –40°C to +85°C.
CONNECTION DIAGRAM
Plastic Mini-DIP (N)
Cerdip (Q) and
Plastic SOIC (R) Packages
AMPLIFIER 1
AMPLIFIER 2
OUTPUT 1
–IN 2
؉IN 3
V– 4
AD706 8 V؉
7 OUTPUT
6 –IN
TOP VIEW
5 ؉IN
The AD706 is offered in three varieties of an 8-lead package:
plastic mini-DIP, hermetic cerdip and surface mount (SOIC).
“J” grade chips are also available.
PRODUCT HIGHLIGHTS
1. The AD706 is a dual low drift op amp that offers BiFET
level input bias currents, yet has the low IB drift of a bipolar
amplifier. It may be used in circuits using dual op amps such
as the LT1024.
2. The AD706 provides both low drift and high dc precision.
3. The AD706 can be used in applications where a chopper
amplifier would normally be required but without the
chopper’s inherent noise.
100
10
TYPICAL JFET AMP
1
0.1
AD706
0.01
–55
+25 +110
TEMPERATURE – ؇C
+125
Figure 1. Input Bias Current vs. Temperature
REV. C
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.
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., 1997
1 page  
1000
1000
AD706
100
10
1
1 10 100 1000
FREQUENCY – Hz
Figure 11. Input Noise Voltage
Spectral Density
100
10
100⍀
20M⍀
10k⍀
VOUT
1
1 10 100 1000
FREQUENCY – Hz
Figure 12. Input Noise Current
Spectral Density
0.5V
05
10
TIME – Seconds
Figure 13. 0.1 Hz to 10 Hz Noise
Voltage
1000
900
800 +125؇C
+25؇C
700
600
0
–55؇C
5 10 15
SUPPLY VOLTAGE – ؎ Volts
20
Figure 14. Quiescent Supply Current
vs. Supply Voltage
+160
+140
+120
+100
+80
+60
+40
+20
0
0.1 1
10 100 1k 10k 100k 1M
FREQUENCY – Hz
Figure 15. Common-Mode Rejection
Ratio vs. Frequency
180
160
140
120
100
– PSRR
80
+ PSRR
60
40
20
0.1 1
10 100 1k 10k 100k 1M
FREQUENCY – Hz
Figure 16. Power Supply Rejection
Ratio vs. Frequency
10M
1M
–55؇C
+25؇C
+125؇C
100k
1
2 4 6 8 10
LOAD RESISTANCE – k⍀
100
Figure 17. Open-Loop Gain vs. Load
Resistance vs. Load Resistance
140 0
120 30
100 60
PHASE
80 90
60 120
40 150
GAIN
20 180
0 210
–20
0.01 0.1 1
240
10 100 1k 10k 100k 1M 10M
FREQUENCY – Hz
Figure 18. Open-Loop Gain and
Phase Shift vs. Frequency
+VS
–0.5
–1.0
–1.5
+1.5
+1.0
+0.5
–VS
0
5 10 15
SUPPLY VOLTAGE – ؎ Volts
20
Figure 19. Output Voltage Swing vs.
Supply Voltage
REV. C
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AD706.PDF ] | |
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