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AD704AR PDF预览

AD704AR

更新时间: 2024-11-03 22:05:23
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页数 文件大小 规格书
8页 400K
描述
Quad Picoampere Input Current Bipolar Op Amp

AD704AR 数据手册

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Quad Picoampere Input Current  
Bipolar Op Amp  
a
AD704  
FEATURES  
CONNECTION DIAGRAMS  
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  
14-Pin Plastic DIP (N)  
14-Pin Cerdip (Q) Packages  
16-Pin SOIC  
(R) Package  
OUTPUT  
–IN  
14  
13  
12  
11  
10  
9
16  
15  
14  
13  
12  
11  
10  
9
1
2
3
4
5
6
7
OUTPUT  
–IN  
OUTPUT  
–IN  
1
2
3
4
5
6
7
8
OUTPUT  
–IN  
1
4
1
4
Low Noise  
0.5 V p-p typical Noise, 0.1 Hz to 10 Hz  
Low Power  
600 A max Supply Current per Amplifier  
Chips & MIL-STD-883B Processing Available  
Available in Tape and Reel in Accordance  
with EIA-481A Standard  
+
+
IN  
+
IN  
+
IN  
IN  
AD704  
AD704  
+V  
S
+V  
S
–V  
+
–V  
S
S
(TOP VIEW)  
(TOP VIEW)  
+
IN  
IN  
+
+
IN  
IN  
–IN  
OUTPUT  
NC  
2
3
–IN  
–IN  
–IN  
2
3
OUTPUT  
NC  
OUTPUT  
8
OUTPUT  
Single Version: AD705, Dual Version: AD706  
PRIMARY APPLICATIONS  
Industrial/Process Controls  
Weigh Scales  
ECG/EKG Instrumentation  
Low Frequency Active Filters  
NC = NO CONNECT  
20-Terminal LCC  
(E) Package  
1
3
2
20 19  
PRODUCT DESCRIPTION  
4
+IN1  
+IN4  
NC  
18  
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 tempera-  
ture), 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.  
NC 5  
17  
16  
AMP 1  
AMP 4  
+V  
–V  
S
6
7
S
AD704  
AMP 2  
AMP 3  
NC  
15 NC  
+IN2 8  
14 +IN3  
9
11  
13  
10  
12  
NC = NO CONNECT  
100  
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.  
10  
TYPICAL JFET AMP  
1
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 and AD704B are 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.  
0.1  
AD704T  
0.01  
–55  
+25  
+125  
TEMPERATURE – °C  
Figure 1. Input Bias Current Over Temperature  
REV. A  
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: 617/329-4700  
Fax: 617/326-8703  

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