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AD705TQ/883B PDF预览

AD705TQ/883B

更新时间: 2024-11-03 22:18:55
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描述
Picoampere Input Current Bipolar Op Amp

AD705TQ/883B 数据手册

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Picoampere Input Current  
Bipolar Op Amp  
a
AD705  
FEATURES  
DC PERFORMANCE  
CONNECTION DIAGRAM  
25 V max Offset Voltage (AD705T)  
0.6 V/؇C max Drift (AD705K/T)  
100 pA max Input Bias Current (AD705K)  
600 pA max IB Over MIL Temperature Range (AD705T)  
114 dB min CMRR (AD705K/T)  
114 dB min PSRR (AD705T)  
200 V/mV min Open Loop Gain  
0.5 V p-p typ Noise, 0.1 Hz to 10 Hz  
600 A max Supply Current  
Plastic Mini-DIP (N)  
Cerdip (Q) and  
Plastic SOIC (R) Packages  
OFFSET  
NULL  
OFFSET  
NULL  
TOP VIEW  
1
2
3
4
8
7
6
5
–IN  
+IN  
V–  
V+  
OUTPUT  
OVER  
COMP  
AD705  
AC PERFORMANCE  
0.15 V/µs Slew Rate  
800 kHz Unity Gain Crossover Frequency  
10,000 pF Capacitive Load Drive Capability  
Low Cost  
Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip  
and Surface Mount (SOIC) Packages  
MIL-STD-883B Processing Available  
Dual Version Available: AD706  
Quad Version: AD704  
levels, the commonly used “balancing” resistor (connected be-  
tween the noninverting input of a bipolar op amp and ground) is  
not required.  
The AD705 is an excellent choice for use in low frequency ac-  
tive filters in 12- and 14-bit data acquisition systems, in preci-  
sion instrumentation and as a high quality integrator.  
APPLICATIONS  
The AD705 is internally compensated for unity gain and is  
available in five performance grades. The AD705J and AD705K  
are rated over the commercial temperature range of 0°C to  
+70°C. The AD705A and AD705B are rated over the industrial  
temperature range of –40°C to +85°C. The AD705T is rated  
over the military temperature range of –55°C to +125°C and is  
available processed to MIL-STD-883B, Rev. C.  
Low Frequency Active Filters  
Precision Instrumentation  
Precision Integrators  
PRODUCT DESCRIPTION  
The AD705 is a low power bipolar op amp that has the low in-  
put bias current of a BiFET amplifier but which offers a signifi-  
cantly lower IB drift over temperature. The AD705 offers many  
of the advantages of BiFET and bipolar op amps without their  
inherent disadvantages. It utilizes superbeta bipolar input tran-  
sistors to achieve the picoampere input bias current levels of  
FET input amplifiers (at room temperature), while its IB typi-  
cally only increases 5 times vs. BiFET amplifiers which exhibit a  
1000X increase over temperature. This means that, at room  
temperature, while a typical BiFET may have less IB than the  
AD705, the BiFET’s input current will increase to a level of  
several nA at +125°C. Superbeta bipolar technology also per-  
mits the AD705 to achieve the microvolt offset voltage and low  
noise characteristics of a precision bipolar input amplifier.  
The AD705 is offered in three varieties of 8-pin package: plastic  
DIP, hermetic cerdip and surface mount (SOIC). “J” grade  
chips are also available.  
PRODUCT HIGHLIGHTS  
1. The AD705 is a low drift op amp that offers BiFET level  
input bias currents, yet has the low IB drift of a bipolar ampli-  
fier. It upgrades the performance of circuits using op amps  
such as the LT1012.  
2. The combination of Analog Devices’ advanced superbeta  
processing technology and factory trimming provides both  
low drift and high dc precision.  
3. The AD705 can be used in applications where a chopper am-  
plifier would normally be required but without the chopper’s  
inherent noise and other problems.  
The AD705 is a high quality replacement for the industry-  
standard OP07 amplifier while drawing only one sixth of its  
power supply current. Since it has only 1/20th the input bias  
current of an OP07, the AD705 can be used with much higher  
source impedances, while providing the same level of dc preci-  
sion. In addition, since the input bias currents are at picoAmp  
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.  
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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