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PRODUCT DESCRIPTION

The AD705 is a 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. The AD705 offers many of the advantages of BiFET and bipolar op amps without their inherent disadvantages. It utilizes superbeta bipolar input transistors to achieve the picoampere input bias current levels of FET input amplifiers (at room temperature), while its IB typically 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 permits the AD705 to achieve the microvolt offset voltage and low noise characteristics of a precision bipolar input amplifier.

FEATURES

DC PERFORMANCE

25 mV max Offset Voltage (AD705T)

0.6 mV/8C 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 mV p-p typ Noise, 0.1 Hz to 10 Hz

600 mA max Supply Current

AC PERFORMANCE

0.15 V/?s 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

APPLICATIONS

Low Frequency Active Filters

Precision Instrumentation

Precision Integrators