M35N - Mezzanine Card with 8/16 Analog Inputs, 14 Bits

The mezzanine card M35N is a 14-bit analog M-Module for a wide range of standard input requirements such as 16 channels single-ended voltage or current and 8 channels differential voltage or current. The isolated supply voltages are generated by an onboard DC/DC converter, which is also usable in the extended temperature range of -40 to +85°C. A fast A/D converter and auto-incrementation of the multiplexer channel make the M-Module ideal for fast sampling. The complete acquisition time of an M35N is 7.8µs and the precision is better than 0.1%. The M35N features totally automatic adjustment of each channel and each input range.

The M35N 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.


  • 8/16 current or voltage inputs
  • 14 bits resolution
  • 7.8 µs acquisition/conversion time
  • Precision better than 0.1 %
  • Unipolar/bipolar software-selectable
  • Autoincrement of channel number
  • External triggering
  • Optical isolation (500 V)
  • -40 °C to +85 °C versions


A/D Conversion
  • 14 bits @ 7.8µs
  • Precision: depends on M-Module settings; see user manual
  • Noise: depends on M-Module settings; see user manual
  • Programmable gain factor of 1, 2, 4 or 8 (factor 16 by hardware jumpering)
  • Software-selectable unipolar or bipolar operation
  • Sample and hold
  • Autoincrement of channel number
Input Signal Conditioning: 16 inputs
  • Voltage or Current Inputs
    • 16 analog inputs, single-ended
    • High input voltage tolerance
    • Cross-talk less than 60db
    • Low-pass filter 1kHz
  • Voltage Measurement
    • Voltage max.: ±15V
    • Voltage full scale: ±10V
    • Input resistance: 100 kOhm, ±10%
  • Current Measurement
    • Current max.: ±25mA
    • Current full scale: ±20mA, UA = ±1.25V
    • Load resistance: 62.5 Ohm, ±0.1%
Input Signal Conditioning: 8 inputs
  • Voltage or Current Inputs
    • 8 analog inputs, differential
    • High common mode range ±200V
    • Cross-talk less than 60db
    • Low-pass filter 3kHz
  • Voltage Measurement
    • Voltage max.: ±200V (common mode)
    • Voltage full scale: ±10V
    • Input resistance: 400 kOhm typ.
  • Current Measurement
    • Current max.: ±25mA
    • Voltage max. to IGND: ±200V
    • Input resistance: 62.5 Ohm, ±0.1%
  • External trigger (isolated, rising-edge sensitive)
  • External binary input
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 between isolated side and digital side
    • 180V DC between the channels
    • Voltage between the connector shield and isolated ground is limited to 180V using a varistor; AC coupling between connector shield and isolated ground through 47nF capacitor
  • Supply voltages/power consumption:
    • +5V (4.85V..5.25V), 300mA
  • MTBF: 198,000h @ 40°C (derived from MIL-HDBK-217F)
Mechanical Specifications
  • Dimensions: conforming to M-Module Standard
  • Weight: 84g (incl. adapter)
Environmental Specifications
  • Temperature range (operation):
    • 0..+60°C or -45..+85°C
    • Airflow: min. 10m³/h
  • Temperature range (storage): -40..+85°C
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (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