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AD704 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD704
Szczegółowy opis  Quad Picoampere Input Current Bipolar Op Amp
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Strona internetowa  http://www.analog.com
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AD704 Arkusz danych(HTML) 1 Page - Analog Devices

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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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD704
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
Quad Picoampere Input Current
Bipolar Op Amp
FEATURES
High DC Precision
75
V Max Offset Voltage
1
V/ C Max Offset Voltage Drift
150 pA Max Input Bias Current
0.2 pA/ C Typical IB Drift
Low Noise
0.5
V p-p Typical Noise, 0.1 Hz to 10 Hz
Low Power
600
A Max Supply Current per Amplifier
MIL-STD-883B Processing Available
Available in Tape and Reel in Accordance
with EIA-481A Standard
Dual Version: AD706
APPLICATIONS
Industrial/Process Controls
Weigh Scales
ECG/EKG Instrumentation
Low Frequency Active Filters
PRODUCT DESCRIPTION
The AD704 is a quad, 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 super-beta
bipolar input transistors to achieve picoampere input bias current
levels (similar to FET input amplifiers at room temperature),
while its IB typically only increases by 5
× at 125°C (unlike a
BiFET amp, for which IB doubles every 10
°C resulting in a
1000
× increase at 125°C). Furthermore, the AD704 achieves
75
µV offset voltage and low noise characteristics of a precision
bipolar input op amp.
Since it has only 1/20 the input bias current of an AD OP07, the
AD704 does not require the commonly used “balancing” resistor.
Furthermore, the current noise is 1/5 that of the AD OP07 which
makes the AD704 usable with much higher source impedances.
At 1/6 the supply current (per amplifier) of the AD OP07, the
AD704 is better suited for today’s higher density circuit boards
and battery-powered applications.
The AD704 is an excellent choice for use in low frequency active
filters in 12- and 14-bit data acquisition systems, in precision
instrumentation, and as a high quality integrator. The AD704 is
internally compensated for unity gain and is available in five
performance grades. The AD704J and AD704K are rated over
the commercial temperature range of 0
°C to 70°C. The AD704A
is rated over the industrial temperature of –40
°C to +85°C. The
AD704T is rated over the military temperature range of –55
°C
to +125
°C and is available processed to MIL-STD-883B, Rev. C.
CONNECTION DIAGRAMS
14-Lead Plastic DIP (N)
14-Lead CerDIP (Q) Packages
1
4
1
2
3
4
5
6
7
OUTPUT
–IN
–IN
OUTPUT
OUTPUT
–IN
–IN
OUTPUT
AD704
(TOP VIEW)
+IN
+IN
+IN
+VS
–VS
+IN
2
3
8
9
10
11
12
13
14
16-Lead SOIC
(R) Package
2
3
11
10
12
13
14
15
16
9
1
2
3
4
5
6
7
8
NC = NO CONNECT
NC
1
4
OUTPUT
–IN
–IN
OUTPUT
OUTPUT
–IN
–IN
OUTPUT
AD704
(TOP VIEW)
+IN
+IN
+IN
+VS
–VS
+IN
NC
20-Terminal LCC
(E) Package
AMP 1
AMP 2
AMP 4
AMP 3
32
1
20
19
18
17
16
15
14
910
11
12
13
4
5
6
7
8
+IN4
NC
–VS
NC
+IN3
+IN1
NC
+VS
NC
+IN2
NC = NO CONNECT
AD704
100
10
1
0.1
0.01
–55
+25
+125
TEMPERATURE – C
TYPICAL JFET AMP
AD704T
Figure 1. Input Bias Current Over Temperature


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