AD538

NOT RECOMMENDED FOR NEW DESIGNS

Real-Time Analog Computational Unit (ACU)

Data Sheet (Rev. E) Product Selection Table

Part Models: 7
1ku List Price: Starting From $60.03

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Overview

V_OUT = V_Y (V_Z divided by V_X)^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)
+2 V and +10 V On-Chip References
Monolithic Construction

The AD538 is a monolithic real-time computational circuit which 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 microV or less add to the overall off-the-shelf performance level. Real-time analog signal processing is further enhanced by the device's 400 kHz bandwidth.

The AD538's overall transfer function is V_o=V_y(V_z/V_x)^m. Programming a particular function is via pin strapping. No external components are required for one-quadrant (positive input) multiplication and division. Two-quadrant (bipolar numerator) division is possible with the use of external level shifting and scaling resistors. The desired scale factor for both multiplication and division can be set using the on-chip +2 V or +10 V references, or controlled externally to provide simultaneous multiplication and division. Exponentiation with an M value from 0.2 to 5 can be implemented with the addition of one or two external resistors.

Direct log ratio computation is possible by utilizing only the log ratio and output sections of the chip. Access to the multiple summing junctions adds further to the AD538's flexibility. Finally, a wide power-supply range of ±4.5 V to ±18 V allows operation from standard ±5 V, ± 12 V and ± 15 V supplies.

The AD538 is available in two accuracy grades (A and B) over the industrial (-25°C to +85°C) temperature range and one grade (S) over the military (-55°C to +125°C) temperature range. The device is packaged in an 18-pin TO-118 hermetic size-brazed ceramic DIP. A-grade chips are also available.

APPLICATIONS

One- or two-quadrant multiply/divide
Log ratio computation
Squaring/square rooting
Trigonometric function approximations
Linearization via curve fitting
Precision AGC
Power functions

Part Models: 7
1ku List Price: Starting From $60.03

Documentation

Data Sheet 1

AD538: Real-Time Analog Computational Unit Data Sheet (Rev.E) 09/28/2006

Application Note 1

AN-304: One Chip "Slide-Rule" Works With Logs, Antilogs for Real Time Processing 01/01/2000

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD538ACHIPS	none available	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD538AD	18-Lead Side-Brazed CerDIP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD538ADZ	18-Lead Side-Brazed CerDIP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD538BD	18-Lead Side-Brazed CerDIP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD538BDZ	18-Lead Side-Brazed CerDIP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD538SD	18-Lead Side-Brazed CerDIP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD538SD/883B	18-Lead Side-Brazed CerDIP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 16, 2025 - 25_0091 Qualification of Wafer Fabrication Site Analog Devices, Inc. Camas WA for (Bipolar) Products
		PCN25_0091_Form Material_Report Qualification Results Summary
AD538ACHIPS	PRODUCTION
AD538AD
AD538ADZ
AD538BD	PRODUCTION
AD538BDZ	PRODUCTION
AD538SD	PRODUCTION
AD538SD/883B
Jun 6, 2012 - 12_0066 Add capacity for Burn In of Hermetic, 883 & QMLQ/Class B devices at TSSI Cavite
		PCN12_0066_Form Material_Report Qualification Report Summary
AD538AD
AD538SD/883B
Nov 9, 2011 - 11_0050 Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines
		PCN11_0050_Form Material_Report
AD538AD
AD538ADZ
AD538BD	PRODUCTION
AD538BDZ	PRODUCTION
AD538SD	PRODUCTION
AD538SD/883B
Nov 9, 2011 - 11_0182 Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines
		PCN11_0182_Form Material_Report
AD538AD
AD538ADZ
AD538BD	PRODUCTION
AD538BDZ	PRODUCTION
AD538SD	PRODUCTION
AD538SD/883B
Apr 9, 2018 - 16_0026 Qualify TeamQuest Technology, Inc. for Burn-in and Life Test of Military and Aerospace Devices
		PCN16_0026_Form Material_Report Qualification Results Summary
AD538SD/883B

This is the most up-to-date revision of the Data Sheet.

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