Block diagram

Resolver/LVDT-to-digital converter

(Prototype chips are available for demonstration. Final product version will be ready by Q1/2021.)

The RDC1001 device is a 16-bit resolution resolver/LVDT-to-digital converter, which is capable of reading the sine and cosine angle from a resolver sensor, or the linear distortion from a LVDT sensor (selectable by setting a switch). The converter accepts 1.2 Vpp input signals, in the range of 2.5 kHz to 20 kHz on the sine and cosine inputs. When it is used to read out a resolver, a digital type II servo loop is employed to track the inputs and convert the input sine and cosine information into a digital representation of the input angle and velocity. When it is connected to a LVDT, a ratiometric conversion is applied to calculate the linear distortion.

Main features

  • Complete monolithic resolver/LVDT-to-digital converter
  • Parallel and serial data ports
  • Absolute position and velocity outputs
  • On-chip clock source
  • On-chip power regulators
  • On-chip temperature sensor
  • Type-II digital tracking loop
  • Integrated analog frontend with programmable gain

Key Technical Specifications

  • Temperature range: -50 to 125 °C
  • Input voltage range: 1.2 Vpp
  • Resolution: 16 bits
  • Phase lock range: -45 to 45 °
  • Accuracy: 5 arc min
  • Bandwidth: 1.5 kHz
  • Tracking rate: 800 rps
  • Sampling rate: 40 kSPS
  • Settling time: 50 ms

Radiation Hardness

  • TID tolerance: >100 Mrad
  • SEL: >100 MeV·cm2/mg
  • SET/SEU: >60 MeV·cm2/mg


  • DC and AC servo motor control
  • Electric power steering
  • Electric vehicles
  • Automated motion sensing and control
  • Remote handling

This ASIC is part of a front-end rad-hard BiSS I/O module designed by MAGICS Instruments within Fusion for Energy remote handling activities (F4E-OMF-0633-01-03).