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

	Highlights 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.
	Description Overview 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. Details 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 +85°C) 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.
	Ordering Information VCM-DAS-3a … 12-bit, 16 channel D/A converter with 24-bit digital I/O Accessories VL-CBR-4004 I/O cable assembly and paddleboard (RoHS) VL-HDW-101 Standoff Pkg., metric thread
	Specifications 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. 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 +85°C Operating Temperature -40° to +85°C Thermal Shock 5°C/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 .02g²/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 µs 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