AD598

PRODUCTION

LVDT Signal Conditioner

Data Sheet (Rev. A) Product Selection Table

Part Models: 5
1ku List Price: Starting From $39.52

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Overview

Single Chip Solution, Contains Internal Oscillator and Voltage Reference
No Adjustments Required
Insensitive to Transducer Null Voltage
Insensitive to Primary to Secondary Phase Shifts
DC Output Proportional to Position
20 Hz to 20 kHz Frequency Range
Single or Dual Supply Operation
Unipolar or Bipolar Output
Will Operate a Remote LVDT at Up to 300 Feet
Position Output Can Drive Up to 1000 Feet of Cable
Will Also Interface to an RVDT
Outstanding Performance
Linearity: 0.05% of FS max
Output Voltage: ±11 V min
Gain Drift: 50 ppm/°C of FS max
Offset Drift: 50 ppm/°C of FS max

The AD598 is a complete, monolithic Linear Variable Differential Transformer (LVDT) signal conditioning subsystem. It is used in conjunction with LVDTs to convert transducer mechanical position to a unipolar or bipolar dc voltage with a high degree of accuracy and repeatability. All circuit functions are included on the chip. With the addition of a few external passive components to set frequency and gain, the AD598 converts the raw LVDT secondary output to a scaled dc signal. The device can also be used with RVDT transducers.

The AD598 contains a low distortion sine wave oscillator to drive the LVDT primary. The LVDT secondary output consists of two sine waves that drive the AD598 directly. The AD598 operates upon the two signals, dividing their difference by their sum, producing a scaled unipolar or bipolar dc output.

The AD598 uses a unique ratiometric architecture (patent pending) to eliminate several of the disadvantages associated with traditional approaches to LVDT interfacing. The benefits of this new circuit are: no adjustments are necessary, transformer null voltage and primary to secondary phase shift does not affect system accuracy, temperature stability is improved, and transducer interchangeability is improved.

Part Models: 5
1ku List Price: Starting From $39.52

Documentation

Data Sheet 2

AD598: LVDT Signal Conditioner Data Sheet (Rev.A) 07/14/2008

AD598: Military Data Sheet 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
5962-9067101MRA	20-Lead CerDIP (Side Brazed)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD598AD	20-Lead CerDIP (Side Brazed)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD598JCHIPS	CHIPS OR DIE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD598JRZ	20-Lead SOIC (Wide)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD598SD/883B	20-Lead CerDIP (Side Brazed)	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
5962-9067101MRA
AD598AD
AD598JCHIPS
AD598JRZ	PRODUCTION
AD598SD/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
5962-9067101MRA
AD598SD/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
5962-9067101MRA
AD598AD
AD598SD/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
5962-9067101MRA
AD598AD
AD598SD/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
5962-9067101MRA
AD598AD
AD598SD/883B
Feb 7, 2011 - 10_0003 Halogen Free Material Change for SOIC Wide Body Products Assembled at Amkor
		PCN10_0003_Form Material_Report Qualification Plan Summary
AD598JRZ	PRODUCTION