AD538SD

Overview

The AD538SD is a monolithic real-time analog computational unit providing precision multiplication, division, and exponentiation. It operates over a military temperature range of -55°C to +125°C with a wide dynamic range of 1000:1. The device features a transfer function of VO = VY(VZ/VX)m, where m ranges from 0.2 to 5. Key electrical parameters include a small-signal bandwidth of 400 kHz, quiescent current of 7 mA, and supply voltage range of ±4.5 V to ±18 V. Total error is specified at ±0.25% of reading for a 100:1 input range.

Feature Summary

• Monolithic construction enabling simultaneous analog multiplication, division, and exponentiation without external trims.
• Wide input dynamic range supporting high-accuracy computation across varying signal levels.
• Integrated laser-trimmed bandgap voltage references offering selectable +2 V or +10 V scaling outputs.
• Resistor-programmable exponentiation capabilities allowing powers and roots from 0.2 to 5.

Applications

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

Procurement Notes

Verify the specific suffix SD indicates the military grade (-55°C to +125°C) variant distinct from industrial grades. Confirm package integrity as the device utilizes an 18-lead hermetic side-brazed ceramic DIP. Ensure design compatibility with the required ±4.5 V to ±18 V dual supply rails before integration.

Selection Notes

Select this component when high accuracy over a wide dynamic range is required for real-time analog calculations. The AD538SD is suitable for applications demanding operation in extreme temperatures. Consider the 400 kHz bandwidth and low offset voltages for high-speed signal processing needs requiring minimal external calibration.

Part Context

The AD538 series serves as a versatile analog computational solution, replacing complex hybrid circuits with a single monolithic IC. The AD538SD specifically targets defense and aerospace environments due to its extended military temperature rating. It provides a cost-effective alternative to modular multiplier/divider circuits while maintaining high reliability and precision.

Replacement Considerations

Direct substitutes are not explicitly listed in the provided documentation. Verify pinout and functional compatibility if considering legacy multiplier/divider ICs. Ensure any replacement supports the required 18-lead CDIP package and military temperature specifications.