Datasheet AD706 (Analog Devices)

Dual Picoampere Input Current Bipolar Op Amp AD706 FEATURES CONNECTION DIAGRAM High DC Precision 100 V Max Offset Voltage Plastic Mini-DIP (N) and 1.5 V/ C Max Offset Drift Plastic SOIC (R) Packages 200 pA Max Input Bias Current 0.5 V p-p Voltage Noise, 0.1 Hz to 10 Hz AMPLIFIER 1 AMPLIFIER 2 750 A Supply Current Available in 8-Lead Plastic Mini-DlP OUTPUT 1 AD706 8 V and Surface-Mount (SOIC) Packages –IN 2 7 OUTPUT Available in Tape and Reel in Accordance with IN 3 6 –IN EIA-481A Standard Quad Version: AD704 V– 4 5 IN TOP VIEW APPLICATIONS Low Frequency Active Filters Precision Instrumentation Precision Integrators GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD706 is a dual, low power, bipolar op amp that has the 1. The AD706 is a dual low drift op amp that offers JFET low input bias current of a JFET amplifier, but which offers a level input bias currents, yet has the low IB drift of a bipolar significantly lower IB drift over temperature. It utilizes superbeta amplifier. It may be used in circuits using dual op amps bipolar input transistors to achieve picoampere input bias current such as the LT1024. levels (similar to FET input amplifiers at room temperature), 2. The AD706 provides both low drift and high dc precision. while its IB typically only increases by 5⫻ at 125°C (unlike a JFET amp, for which I 3. The AD706 can be used in applications where a chopper B doubles every 10°C for a 1000⫻ increase at 125°C). The AD706 also achieves the microvolt amplifier would normally be required but without the offset voltage and low noise characteristics of a precision bipolar chopper’s inherent noise. input amplifier. Since it has < 200 pA of bias current, the AD706 does not
100
require the commonly used “balancing” resistor. Furthermore, the current noise is only 50 fA/√Hz, which makes this amplifier usable with very high source impedances. At 600 ␮A max supply current (per amplifier), the AD706 is well suited for today’s
10
high density boards. The AD706 is an excellent choice for use in low frequency
– nA TYPICAL JFET AMP B 1
active filters in 12-bit and 14-bit data acquisition systems, in precision instrumentation, and as a high quality integrator. The AD706 is internally compensated for unity gain and is available
TYPICAL I
in five performance grades. The AD706J is rated over the
0.1
commercial temperature range of 0°C to +70°C. The AD706A is
AD706
rated for the extended industrial temperature range of –40°C to +85°C.
0.01–55 +25 +110 +125
The AD706 is offered in two varieties of an 8-lead package:
TEMPERATURE – C
plastic mini-DIP and surface-mount (SOIC). Figure 1. Input Bias Current vs. Temperature REV. E 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
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Document Outline FEATURES APPLICATIONS CONNECTION DIAGRAM PRODUCT HIGHLIGHTS GENERAL DESCRIPTION SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE METALIZATION PHOTOGRAPH Typical Performance Characteristics 1 Hz, 4-Pole, Active Filter OUTLINE DIMENSIONS Revision History