VMEbus 24 D/A channels. 12 bit industry-standard converters. 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-40 is a general purpose Digital-to-Analog VMEbus board, incorporating features most demanded in today's first class military and industrial applications.

CM-DA-40 - 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, ensuring long term availability.

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

CM-DA-40 - Digital to Analog

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

The CM-DA-40 offers a highly flexible I/O cabling solution using both the front panel & P2. Military versions with thermal overlay greatly improve capability to withstand shock & vibration.

CM-DA-40 - ATR Chassis

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


CM-DA-40/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-40/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-40/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-40/883 - 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-24308 & MIL-C-55302 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-40 Specifications

  • D/A converter: 12 bit multiplying AD-7545. On-chip 12 bit data latch.
  • Channel accuracy: > 0.05% type. (2 mV in 0-5 VDC).
  • Accuracy derating: Better than 5 ppm/°C in all ranges.
  • Output impedance: 0.1 Ohm for output loads > 5 mA.
  • Output protection: All channel current is limited to 20 mA against output short circuits.
  • Galvanic isolation (only on CM-DA-40/2): Full galvanic isolation >1000 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.
  • Power consumption: CM-DA-40/1 (3 W). +5VDC @ 150 mA, +12VDC @ 150 mA, -12VDC @ 50 mA. CM-DA-40/2 (4 W).+5VDC @ 800 mA.
  • Weight: Military R+ & 883.- 670 grams. Commercial & Industrial.- 470 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-40/A: IEC-297 mechanics for 19 inch racks with I/O on front panel.
    • CM-DA-40/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-40 Features

  • 24 D/A output channels per board.
  • 12 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.
  • Low power CMOS design.
  • Commercial, Industrial, MIL-Rugged and 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 & 883 versions.
  • Extensive software support.
  • Extremely simple programming.
  • Excellent price/performance ratio.
  • Two year guarantee.

CM-DA-40 Ordering

Ordering Example: CM-DA-40 /V /T /M

V (Board Version)
1: 24 D/A channels, 12 bit, without galvanic isolation.
2: 24 D/A channels, 12 bit, full galvanic isolation.

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-40/2/R+/B
- 24 D/A channels, 12 bit, full galvanic isolation.
- Military Rugged+ range (-40 to +85°C operating).
- IEEE P1101.2 Military mechanics with wedge-locks.


LEVEL 1, CM-DA-40 MAP: User´s manual. Module hardware functional description oriented toward software development.

LEVEL 2, CM-DA-40 MMT: Maintenance manual. Extended description intended for failure location in the module.

Software Support

Wind River Systems VxWorks Tornado: The CM-DA-40 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.