VMEbus 24 D/A channels. 14 bit industry-standard converters. Built-In-Test. Selection of common or individual external input reference per channel. Full galvanic isolation.

Extensive Software Support

BSPs for the leading real-time operating systems - UNIX, SUN, WIN, etc.


The CM-DA-50 is a general purpose 24 channel Digital-to-Analog VMEbus board., incorporating features most demanded in today's first class military & industrial applications.

CM-DA-50 - Digital to Analog

This board implements industry-standard TTL chips with easily obtainable D/A converters supplied by several leading vendors in all temperature ranges. This ensures availability of the module for long term applications.

The metallic layer within the PCB benefits heat dissipation & uniform component temperatures, thus increasing component longevity & module MTBF.

CM-DA-50 - Digital to Analog

With individual external reference per channel, this module is well suited for applications requiring special voltage ranges or a wide variations in channel ranges.

Military versions with thermal overlay greatly improve capability to withstand shock & vibration.

The CM-DA-50 offers a highly flexible I/O cabling solution using VME64x connectors on both front panel and P2. Both connectors have identical pin-out.

CM-DA-50 - ATR Chassis

All versions are compatible at the function level, Industrial versions allow low cost software development.


CM-DA-50/C - Commercial

C: Commercial range >> Implements low cost Commercial plastic IC's rated for 0 to +70°C. Continuous board operation from 0 to +60°C. Class II industrial quality connectors. Storage from -10 to +85°C.


CM-DA-50/I - Industrial

I: Industrial range >> Manufactured with Industrial range plastic or ceramic IC's rated for -25 (-40) to +85°C. Continuous module operation from -20 to +75°C. Class II industrial quality connectors. Storage from -40 to +100°C.


CM-DA-50/R+ - Military Rugged

R+: Military Rugged+ range >> Implements ceramic IC's rated from -55 to +125°C. Class I MIL-C-55302 connectors. Conduction cooled PCB with thermal overlay. Operation from -40 to +85°C. Storage from -55 to +125°C.

Military 883

CM-DA-50/883 - Military 883

883: Military 883 range >> Manufactured with conduction cooled PCB & MIL-STD-883 B/C military ceramic parts (-55 to +125°C). Class I MIL-C-55302 connectors. Operation from -50 to +90°C. Storage from -55 to +125°C.

MIL-STD Components

  • MIL-STD-810D Temperature (Methods 501.2 & 502.2)
  • -55°C to +125°C ceramic military ICs
  • Military Class V Printed Circuit Board
  • MIL-C-55302 & MIL-C-24308 Class I Connectors
  • Thin film 0.1% precision Resistors
  • MIL-E-5400 Class 1B (Temp. & Altitude)
  • MIL-STD-810D Shock & Vibration (Methods 514 & 516)
  • No PCB tracks in external layers
  • MIL-STD-810D Saline Fog & Dust (Methods 507 & 509)

CM-DA-50 Specifications

  • D/A converter: 14 bit multiplying AD-7545. On-chip 12 bit data latch.
  • Channel accuracy: > 0.02 % type. (2 mV in 0-5 VDC).
  • Accuracy derating: Better than 2 ppm/°C in all ranges.
  • Output impedance: 0.1 Ohm for output loads > 5 mA.
  • Output protection: All channel current is limited to 15 mA against output short circuits.
  • Galvanic isolation (only on CM-DA-50/2): Full galvanic isolation > 800 V on all analog I/O signals with respect the VMEbus power & TTL lines.
  • DC standard ranges: 0-5, 0-10, ±5 or ±10 VDC using the on-board voltage reference.
  • External references: One common external voltage reference is applied to all channels. Jumper selectable individual external voltage reference per channel.
  • External reference range: References can be any AC/DC voltage in the range of ±10 Volts.
  • External reference input protection: Protection up to ±25 Volts on all external input references.
  • Built-In-Test: Dedicated BIT A/D converter for testing all on board TTL, D/A converters & analog chips.
  • Power consumption: CM-DA-50/1 (3 W).+5VDC @ 150 mA, +12VDC @ 90 mA, -12VDC @ 80 mA. CM-DA-50/2 (4 W).+5VDC @ 800 mA.
  • Weight: Military R+ & 883.- 790 grams. Commercial & Industrial.- 600 grams.
  • Mechanical size: Single slot 6U (233.4x160 mm).
  • VMEbus interface: A24/D16 Standard slave interface.
  • VMEbus addressing: Two jumper blocks provide 256 mapping options in the A24 range.
  • Mechanical format:
    • CM-DA-50/A: IEC-297 mechanics for 19 inch racks with I/O on front panel.
    • CM-DA-50/B: Military IEEE P1101 wedgelock mechanics for ATR enclosures.
  • Humidity: Up to 95% RH non-condensing.
  • Altitude: Sea level up to 15 Km (50,000 ft.).

CM-DA-50 Features

  • 24 D/A output channels per board.
  • 14 bit industry-standard converters.
  • Full galvanic isolation.
  • Analog I/O signals via three front panel cannon connectors or P2 connector.
  • On-board precision voltage reference for standard unipolar & bipolar ranges.
  • Selection of common or individual external input voltage reference per channel.
  • Independent channel calibration.
  • High accuracy analog outputs.
  • Low power CMOS design.
  • On board Built-In-Test capability allows testing all module TTL chips.
  • Industrial, MIL-Rugged & MIL-STD-883 versions.
  • Available in IEC-297 mechanics, I/O via front panel & military P1101.2 mechanics with wedge-locks.
  • Conduction cooled PCB with thermal overlay in MIL-Rugged and 883 versions.
  • Extensive software support.
  • Extremely simple programming.
  • Excellent price/performance ratio.
  • Two year guarantee.

CM-DA-50 Ordering

Ordering Example: CM-DA-50 /V /T /M

V (Board Version)
1: 24 D/A channels, 14 bit, without galvanic isolation.
2: 24 D/A channels, 14 bit, full galvanic isolation >800 Volts.

T (Board Temperature Range)
C: Commercial. Fiberglass PCB only.
I: Industrial. Fiberglass PCB only.
R+: Military Rugged+. Conduction cooled PCB only.
883: Military 883. Conduction cooled PCB only.

M (PCB Mechanical Version)
A: IEC-297 Mechanics with front panel I/O connectors.
B: P1101.2 Military mechanics, dummy front panel & wedge-locks.

Ordering Example

Part Number Example: CM-DA-50/2/R+/B
- 24 D/A channels, 14 bit, full galvanic isolation.
- Military Rugged+ range (-40 to +85°C operating).
- IEEE P1101.2 Military mechanics with wedge-locks.


LEVEL 1, CM-DA-50 MAP: User´s manual. Module hardware functional description oriented toward software development.

LEVEL 2, CM-DA-50 MMT: Maintenance manual. Extended description intended for failure location in the module.

Software Support

Wind River Systems VxWorks Tornado: The CM-DA-50 is supported by VxWorks Tornado & is ideal for developing real time software under UNIX environments. A complete "C" language driver in source code is available at low cost. Drivers include a floppy-disk & user's manual.

Microware Systems OS-9: Drivers for the real time OS-9 Operating System are available in "C" language. This driver is supplied with user's manual & source code floppy-disk.

Microtec Research MCC-68K Drivers: A "C" language source code driver written for the MCC-68K cross-compiler from Microtec Research. This low cost option is intended for using a PC as host.

* NOTE - Drivers for other leading operating systems can be optionally supplied under request.