Picoampere Input Current Quad
Bipolar Op Amp
AD704
OUTPUT 1 1 +IN 3 AD704 +VS 4 TOP VIEW +IN 5
–IN 6 2 3 OUTPUT 7 14 OUTPUT +IN 3 13 –IN +VS 4 12 +IN +IN 5 11 –VS –IN 6 10 +IN OUTPUT 7 9 –IN 8 OUTPUT (Not to Scale) –IN1 OUT1 NC OUT4 –IN4 2 1 20 19 1 4 NC 5 AD704 +VS 6 TOP VIEW
(Not to Scale) 9 10 11 12 NC OUT3 3 13 –IN3 2 +IN2 8 13 –VS TOP VIEW 12 +IN
2 11 –IN 3 10 OUTPUT NC = NO CONNECT NC 7 The AD704 is a quad, low power bipolar op amp that has the
low input bias current of a BiFET amplifier and offers a significantly lower IB drift over temperature. It uses superbeta bipolar
input transistors to achieve picoampere input bias current levels
(similar to FET input amplifiers at room temperature), while its
IB typically increases only by 5× at 125°C (unlike a BiFET amp,
for which IB doubles every 10°C, resulting in a 1000× increase at
125°C). In addition, the AD704 achieves 150 μV offset voltage and
the low noise characteristics of a precision bipolar input op amp. 14 +IN AD704 Figure 2. 16-Lead SOIC (R) Package 3 +IN1 4 15 –IN 4 NC 8 (Not to Scale) 9 NC Figure 1. 14-Lead Plastic DIP (N) GENERAL DESCRIPTION 18 +IN4 17 NC 16 –VS 15 NC 14 +IN3 NC = NO CONNECT Figure 3. 20-Terminal LCC
(E-20-1) Package
100 TYPICAL IB (nA) 10
TYPICAL JFET AMP
1 0.1
AD704
0.01
–55 25
TEMPERATURE (°C) 125 00818-004 The AD704 is an excellent choice for use in low frequency active
filters in 12-and 14-bit data acquisition systems, in precision …