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AD704JR-/REEL

更新时间: 2024-11-20 03:01:51
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12页 225K
描述
Quad Picoampere Input Current Bipolar Op Amp

AD704JR-/REEL 数据手册

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Quad Picoampere Input Current  
Bipolar Op Amp  
a
AD704  
FEATURES  
CONNECTION DIAGRAMS  
High DC Precision  
14-Lead Plastic DIP (N)  
14-Lead CerDIP (Q) Packages  
16-Lead SOIC  
(R) Package  
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  
1
2
3
4
5
6
7
14  
1
2
3
4
5
6
7
8
OUTPUT  
16  
15  
OUTPUT OUTPUT  
OUTPUT  
13  
12  
4
1
–IN  
+IN  
–IN  
+IN  
–V  
4
IN  
1
IN  
0.5 V p-p Typical Noise, 0.1 Hz to 10 Hz  
Low Power  
+IN  
14  
13  
12  
11  
10  
9
+IN  
AD704  
(TOPVIEW  
AD704  
(TOPVIEW)  
11  
10  
9
+V  
S
V  
+V  
S
S
S
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  
)
+IN  
–IN  
+IN  
+IN  
IN  
+IN  
2
2
3
3
–IN  
IN  
8
OUTPUT  
OUTPUT  
OUTPUT  
OUTPUT  
NC  
NC  
APPLICATIONS  
NC = NO CONNECT  
Industrial/Process Controls  
Weigh Scales  
ECG/EKG Instrumentation  
Low Frequency Active Filters  
20-Terminal LCC  
(E) Package  
3
2
1
20 19  
PRODUCT DESCRIPTION  
+IN4  
NC  
18  
17  
16  
+IN1 4  
NC 5  
+V  
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.  
AMP 1  
AMP 4  
V  
6
S
AD704  
S
AMP 2  
AMP 3  
NC 7  
15  
14  
NC  
+IN3  
+IN2 8  
9
10 11 12 13  
NC = NO CONNECT  
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.  
100  
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  
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.  
0.1  
AD704T  
0.01  
55  
+25  
+125  
TEMPERATURE –  
C
Figure 1. Input Bias Current Over 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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
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  
Fax: 781/326-8703  
www.analog.com  
© Analog Devices, Inc., 2002  

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