AD538AD

Overview

The AD538AD is a monolithic real-time analog computational unit providing precision multiplication, division, and exponentiation. It features a wide dynamic range of 1000:1 for the denominator input and supports simultaneous operations. The device operates with a supply voltage range of ±4.5 V to ±18 V and includes on-board +2 V or +10 V scaling references. It achieves low error rates of ±0.25% of reading within a 100:1 range and maintains small signal bandwidth up to 400 kHz.

Feature Summary

• Monolithic construction enabling real-time analog multiplication, division, and exponentiation without external trims.
• Wide input dynamic range allowing high-accuracy analog division over a 1000:1 denominator span.
• Integrated laser-trimmed bandgap voltage references for precise scaling and offset control.
• Resistor-programmable power and root functions with an exponent range from 0.2 to 5.

Applications

• One- or two-quadrant multiply/divide operations
• Log ratio computation
• Squaring and square rooting
• Trigonometric function approximations
• Precision automatic gain control (AGC)

Procurement Notes

Verify the specific AD538AD grade against the datasheet specifications for total error terms and offset voltages. Confirm that the application environment remains within the rated industrial temperature range of -25°C to +85°C. Ensure supply rails do not exceed the absolute maximum rating of ±18 V to prevent permanent damage. Check pin configurations for correct log-ratio and antilog connections during integration.

Selection Notes

Select the AD538AD when high accuracy is required over a wide dynamic range compared to standard multipliers. Consider the monolithic nature for reduced cost and higher reliability versus hybrid circuits. Evaluate the need for internal references to simplify external component count. Assess if the 400 kHz bandwidth meets the frequency requirements of the signal processing chain.

Part Context

The AD538 series consists of real-time computational units available in different accuracy grades and temperature ranges. The AD538AD represents the A-grade variant designed for industrial applications. It shares the same functional architecture as the BD and SD grades but differs in specified error margins and operating temperature limits. All variants utilize an 18-lead side-brazed ceramic DIP package.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.