AD706 Bipolar Op Amp IC Chip

AD706（Dual Picoampere Input Current Bipolar Op Amp）

Introduction

The AD706 is a dual, low power, bipolar op amp that has the low input bias current of a JFET amplifier, but which offers a significantly lower IB drift over temperature. It utilizes superbeta bipolar input transistors to achieve picoampere input bias current levels (similar to FET input amplifiers at room temperature),while its Ip typically only increases by 5X at 125°C (unlike a JFET amp, for which Ip doubles every 10°C for a 1000X increase at 125°C). The AD706 also achieves the microvolt offset voltage and low noise characteristics of a precision bipolar input amplifier.

Since it has <200pA of bias current, the AD706 does not 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 600μA max supply current (per amplifier), the AD706 is well suited for today’s high density boards.

The AD706 is an excellent choice for use in low frequency active filters in 12-bit and 14-bit data acquisition systems, in precision instrumentation, and as a high quality integrator. The device internally compensates for unity gain and comes in five performance grades. It has a rating over the commercial temperature range of 0°C to +70°C. The AD706A has a rating for the extended industrial temperature range of -40°C to +85°C.

The AD706 is offered in two varieties of an 8-lead package:PDIP and surface-mount (SOIC).

Features

• High DC Precision
• 100μV Max Offset Voltage
• 1.5 μV/°C Max Offset Drift
• 200pA Max Input Bias Current
• 0.5μV p-p Voltage Noise, 0.1 Hz to 10 Hz
• 750 μA Supply Current
• Available in 8-Lead PDIP and Surface-Mount (SOIC) Packages
• Available in Tape and Reel in Accordance with EIA-481A Standard
• Quad Version: AD704

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