M50 - Synchro/Resolver Converter (Product Discontinued)

The mezzanine card M50 is a 1-channel, continuous-tracking synchro- or resolver-to-digital converter with a configurable 10 to 16-bit resolution and a tracking rate of up to 1040 rps. The M-Module has a reference signal generator with a frequency range of 50 Hz to 20 kHz. Reference output voltages can be in a range of 2 Vrms to 21 Vrms. An analog velocity output can be used to monitor the rotational speed.

The M-Module is suited for nearly all synchro/resolver sensors: the user can easily adapt the M50 by plugging passive components.

The M50 is optically isolated and supplied by an on-board DC/DC converter. Optical isolation of the digitized values significantly improves accuracy compared to common transformers.

The M50 is based on the M-Module ANSI mezzanine standard. It can be used as an I/O extension in any type of bus system, i.e. CPCI, VME or on any type of stand-alone SBC. Appropriate M-Module carrier cards in 3U, 6U and other formats are available from MEN or other manufacturers.


  • Resolver/synchro-to-digital converter
  • Up to 16 bits resolution
  • On-board reference frequency generation
  • On-board signal conditioning
  • 2 arc minutes accuracy
  • Analog velocity output
  • Optical isolation
  • -40 °C to +85 °C
  • Not conforming to RoHS


AD2S82A Resolver-to-Digital Converter
  • Resolution: 10/12/14/16 bits
  • Reference input voltage: variable, 2V RMS..90V RMS/115V RMS
  • Reference output voltage: max. 26V RMS, 1.5W
  • Reference frequency range: 50..20,000Hz
  • Accuracy:
    • ±2/±4/±8/±22 arc min, ±1LSB (resolver input)
    • Accuracy: ±9/±13/±15/±29 arc min, ±1LSB (synchro input)
  • Tracking rate: depends on frequency and resolution (max. 1040 rps)
  • Small/large step settling time: depends on frequency and resolution
  • Input signals: 10% max. harmonic distortion
  • Velocity output: ±8V
Peripheral Connections
  • Via front panel on a shielded 25-pin D-Sub receptacle connector
  • Via carrier board (rear I/O)
M-Module Characteristics
Electrical Specifications
  • Isolation voltage: 500V DC
  • Supply voltage/power consumption: +5V (4.85V..5.25V), 550mA typ.
  • MTBF: 34,000h @ 50°C (derived from MIL-HDBK-217F)
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 102g
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C
    • Industrial temperature range on request
    • Airflow: min. 10m³/h
  • Temperature range (storage): -40..+85°C
  • Relative humidity range (operation): max. 95% non-condensing
  • Relative humidity range (storage): max. 95% non-condensing
  • Altitude: -300m to + 3,000m
  • Shock: 15g/11ms
  • Bump: 10g/16ms
  • Vibration (sinusoidal): 2g/10..150Hz
  • Conformal coating on request
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
Tested according to EN 55022 (radio disturbance), IEC 61000-4-2 (ESD) and IEC 61000-4-4 (burst)
Software Support