Home » Products » Data Sheets


VCM-DAS-3Analog Output + Digital I/O Module

Analog Output + Digital I/O Module

PC/104 expansion module: 16 channel analog output and 24 digital I/O lines


  • Analog Output
    16 analog outputs with 12-bit resolution.
  • Multiple Output Ranges
    Configure output ranges via software or with on-board jumpers.
  • DAC Update
    Update outputs individually or simultaneously.
  • Dual ISA Modes
    Enhanced 16-bit ISA functionality is provided while retaining 8-bit compatibility.
  • Read-back Function
    Read-back of DAC and SPAN codes for simplified programming and setup.
  • Configurable Reset Scale
    Configure outputs to reset to zero or mid-scale on power-up.
  • Digital I/O
    24-channels of CMOS/TTL compatible digital I/O.
  • RoHS Compliant
    Meets EU Directive 2002/95/EC.

Software Expertise: Reference & Software Expertise

Embedded PC/104 ModuleRoHS-compliant



The VCM-DAS-3 I/O module provides 16 channels of 12-bit resolution analog outputs along with 24 digital I/O lines on a single PC/104 module. The rugged VCM-DAS-3 is designed to provide capabilities beyond what is presently available on the market while maintaining drop-in compatibility with current industry standards. Ideal applications include process control, closed-loop servo control, and motor-control.


The versatile VCM-DAS-3 I/O module has four LTC2704 quad 12-bit D/A converter chips which provide sixteen 12-bit analog output channels. All output ranges can be configured independently via software or in groups of eight by jumpers. Both unipolar and bipolar mode are fully supported by this module. All analog output channels can be updated individually or simultaneously, either with a software command or in response to an external trigger. The analog outputs can source or sink up to 5mA each. All outputs can be configured to reset to either zero scale or mid-scale on power-up. To facilitate programming and simplify setup, read-back functionality is provided. Enhanced 16-bit ISA functionality is also provided while retaining 8-bit compatibility.

An 82C55 compatible chip provides 24 lines of CMOS/TTL compatible digital I/O which power-up in input mode. Pull-up resistors provide known logic levels during startup.

The VCM-DAS-3 is designed and tested for extended temperature operation (-40 to +85C) and is fully RoHS-compliant. It requires only +5VDC from the system power supply via the PC/104 bus. I/O connections can be made with either a 2mm latching connector or a 50-pin shrouded header for 0.1 legacy connectors.

VersaLogic products are designed for use by OEMs working in a variety of market applications: Aerospace, Defense, Energy, Industrial, Security, Medical, Military, Robotics, and Transportation. Anywhere that the need for superb quality and high-performance embedded computing exists, applications include: automation, avionics, gateway, in-vehicle, monitoring, simulation, and vision.

VersaLogic delivers extremely reliable standard and customized embedded computers backed with unsurpassed service and the highest availability in the market. VersaLogic exists to exceed customers' product, service, support and delivery needs - whenever and wherever the need arises.


General Power Requirements Vcc +5.0V 10% @ 0.5A (2.5W) typ.
Bus Speed PC/104: 8 MHz
16-bit and 8-bit compatible
Compatibility PC/104: Compatible
RoHS: Compliant
Mechanical Board Size 3.55 x 3.775 (90 mm x 96 mm)
Storage Temperature -40 to +85C
Operating Temperature -40 to +85C
Thermal Shock 5C/min over operating temperature
Vibration, Sinusoidal Sweep 2g constant acceleration from 5 to 500Hz, 20 minutes per axis, MIL-STD-202G, Method 204, Modified Condition A
Vibration, Random .02g/Hz (5.35g rms) 15 minutes per axis, MIL-STD-202G, Method 214A, Condition A
Mechanical Shock 30g half-sine, 11 ms duration per axis, MIL-STD-202G, Method 213B, Condition J
Humidity Less than 95%, noncondensing
Analog Outputs Number of Outputs 16
Resolution 12-bits
Output Ranges Bipolar: 10V, 5V, 2.5V, -2.5V to 7.5V
Unipolar: 0 to 10V, 0 to 5V
Output Current 5mA max per channel
Output Impedance 0.015 Ohm (max)
Settling Time 8 s Typ. (10V range, 20V step to 1LSB)
Accuracy 1LSB
Integral Nonlinearity 1LSB
Differential Nonlinearity 1LSB
Calibration One gain and one zero adjustment for all 16 channels
Gain Temp. Coefficient 2 ppm/C
Update Method Simultaneous or individual via software command or external trigger
Reset Outputs reset to 0V when board is jumpered for Enhanced Mode, midscale otherwise
Digital I/O Number of Channels 24 channels
Compatibility CMOS / TTL
Low Input Voltage -0.3V min, 0.8V max
High Input Voltage 2.0V min, 5.5V max
Low Output Voltage 0.4V max
High Output Voltage 3.0V min
Output Current +4mA / -8mA max
Pull-up Resistor 10K Ohm
Reset All channels set to input mode
Software Operating Systems Compatible with most x86 operating systems, including Windows 95/98/NT/CE/XP, QNX, VxWorks, and Linux

Data represent standard operation at 25 C with 5.0V supply unless otherwise noted. Specifications are subject to change without notice. PC/104 is a trademark of the PC/104 Consortium.

Software Support Packages

Source Code
  • VCM-DAS-3 Utilities - 1.0.0
    Utility package containing GNU C compatible example code for testing the analog and digital I/O capabilities of the VCM-DAS-3 module.

Operating System Compatibility

Win 10 - Meets Specifications
Win 8 - Meets Specifications
Win 7 - Meets Specifications
Win XP - Meets Specifications
Win Std 7 - Meets Specifications
Win XPe - Meets Specifications
Win CE - Meets Specifications
Debian - Meets Specifications
Ubuntu - Meets Specifications
Knoppix - Meets Specifications
VxWorks - Meets Specifications
Neutrino - Meets Specifications
DOS - Meets Specifications


Part Number Description Photo
VL-HDW-203PC/104 extractor tool (metal)

Ordering Information

Model Description Operating Temp. Digi-Key logo
VCM-DAS-3a 12-bit, 16 channel D/A + 24-bit digital I/O -40 to +85C

Export Information

Description Value
SCHEDULE B:8471.60.7000