GENERAL DESCRIPTION The AD538 is a monolithic real-time computational circuit that provides precision analog multiplication, division, and exponentiation. The combination of low input and output offset voltages and excellent linearity results in accurate computation over an unusually wide input dynamic range. Laser wafer trimming makes multiplication and division with errors as low as 0.25% of reading possible, while typical output offsets of 100 μV or less add to the overall off-the-shelf performance level. Real-time analog signal processing is further enhanced by the 400 kHz bandwidth of the device. FEATURES VO = VY(VZ/VX)m transfer function Wide dynamic range (denominator) −1000:1 Simultaneous multiplication and division Resistor-programmable powers and roots No external trims required Low input offsets <100 μV Low error ±0.25% of reading (100:1 range) Monolithic construction Real-time analog multiplication, division and exponentiation High accuracy analog division with a wide input dynamic range On board +2 V or +10 V scaling reference Voltage and current (summing) input modes Monolithic construction with lower cost and higher reliability than hybrid and modular circuits APPLICATIONS One- or two-quadrant multiply/divide Log ratio computation Squaring/square rooting Trigonometric function approximations Linearization via curve fitting Precision AGC Power functions
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