AD698
Info: : PRODUCTION
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AD698

Universal LVDT Signal Conditioner

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $134.96
Features
  • Single Chip Solution, Contains Internal Oscillator and Voltage Reference
  • No Adjustments Required
  • Interfaces to Half-Bridge, 4-Wire LVDT
  • DC Output Proportional to Position
  • 20 Hz to 20 kHz Frequency Range
  • Unipolar or Bipolar Output
  • Will Also Decode AC Bridge Signals
  • Outstanding Performance
    Linearity: 0.05%
    Output Voltage: ±11 V
    Gain Drift: 20 ppm/°C (typ)
    Offset Drift: 5 ppm/°C (typ)
Additional Details
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The AD698 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 AD698 converts the raw LVDT output to a scaled dc signal. The device will operate with half-bridge LVDTs, LVDTs connected in the series opposed configuration (4-wire), and RVDTs.

The AD698 contains a low distortion sine wave oscillator to drive the LVDT primary. Two synchronous demodulation channels of the AD698 are used to detect primary and secondary amplitude. The part divides the output of the secondary by the amplitude of the primary and multiplies by a scale factor. This eliminates scale factor errors due to drift in the amplitude of the primary drive, improving temperature performance and stability.

The AD698 uses a unique ratiometric architecture to eliminate several of the disadvantages associated with traditional approaches to LVDT interfacing. The benefits of this new circuit are: no adjustments are necessary; temperature stability is improved; and transducer interchangeability is improved.

The AD698 is available in two performance grades:

Grade Temperature Range Package
AD698AP –40°C to +85°C 28-Pin PLCC
AD698SQ –55°C to +125°C 24-Pin Cerdip
Part Models 2
1ku List Price Starting From $134.96

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD698JCHIPS
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AD698SQ
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Product Lifecycle

PCN

Nov 7, 2012

- 12_0199

Qualification of New Conductive Silver-Filled Glass Die Attach Adhesive for Cerdip and Ceramic Flatpack (Cerpack) Packages.

Nov 9, 2011

- 11_0050

Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines

Nov 9, 2011

- 11_0182

Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Nov 7, 2012

- 12_0199

arrow down

Qualification of New Conductive Silver-Filled Glass Die Attach Adhesive for Cerdip and Ceramic Flatpack (Cerpack) Packages.

Nov 9, 2011

- 11_0050

arrow down

Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines

Nov 9, 2011

- 11_0182

arrow down

Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines

Software & Part Ecosystem

Software & Part Ecosystem

Reference Designs

Reference Designs 1

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