AD704:  Quad Picoampere Input Current Bipolar Op Amp

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 ...More

AD704:  Quad Picoampere Input Current Bipolar Op Amp

Product Description

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.

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.

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 and AD704B are 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.

Features

  • High DC Precision
    75 µV Max Offset Voltage
    1 µV/°C Max Offset Voltage Drift
    150 pA Max Input Bias Current
    0.2 pA/°C Typical IB Drift
  • Low Noise
    0.5 µV p-p Typical Noise, 0.1 Hz to 10 Hz
  • Low Power
    600 µA Max Supply Current per Amplifier
  • MIL-STD-883B Processing Available
  • Available in Tape and Reel in Accordance with EIA-481A Standard
  • Dual Version: AD706

Diagrams

AD704 Diagram
Pin Configuration Diagram for AD704

Specifications

-3dB Bandwidth 800kHz
Slew Rate 150mV/µs
Vos 30µV
Ib 100pA
Input Noise (nV/rtHz) 15nV/rtHz
Vcc-Vee Supply (V) 4 to 36
Iq per Amplifier (max) 600µA
# OpAmps per Pkg 4
Operating Temp Range -55 to +125
Packages DIP,LCC,SOIC

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Part# Small Signal Bandwidth Slew Rate Vos Ib V Noise Density Amplifiers Per Package Widest Temp Range (°C)
AD704 800KHz 150mV/µs 30µV 100pA 15nV/rtHz 4 -55 to +125
AD8608 10MHz 5V/µs 20µV 200fA 6.5nV/rtHz 4 -40 to +125
AD8618 24MHz 12V/µs 23µV 200fA 6nV/rtHz 4 -40 to +125
OP97 900KHz 200mV/µs 30µV 30pA 14nV/rtHz 1 -55 to +125
OP400 500KHz 150mV/µs 80µV 750pA 11nV/rtHz 4 -55 to +125
OP497 500KHz 150mV/µs 80µV 60pA 25nV/rtHz 4 -55 to +125
AD713 4MHz 20V/µs 300µV 40pA 16nV/rtHz 4 -55 to +125 <