Measurement-computing CIO-DDA06 User Manual download pdf (Page 7)

Chapter 1

Introducing the CIO-DDA06

Overview: CIO-DDA06 features

The CIO-DDA06 has six channels of 12-bit analog output and 24 lines of digital I/O. Analog outputs are dual-

DAC AD7273s (two analog outputs per chip), with each output buffered by an OP07. Digital I/O is performed

with one 82C55 chip. The CIO-DDA06 is 100% compatible with MetraByte's DDA-06.

Analog output ranges are switch-selectable for a Bipolar or Unipolar range. Bipolar ranges are ±10 V, ±5 V,

±2.5 V, and ±1.67 V. Unipolar ranges are 0 to 10 V, 0 to 5 V, 0 to 2.5 V, and 0 to 1.67 V.

Analog outputs are grouped in pairs (0/1, 2/3, and 4/5). Each analog output pair is jumper-selectable for either

individual or simultaneous transfer in groups of two, four, or all six.

When a DAC pair is set for simultaneous update, the CIO-DDA06 may be set to hold new values until all

channels are loaded, then update any two, four, or all six channels simultaneously.

The CIO-DDA06 digital I/O lines are a direct interface to an 82C55. The 82C55 is a CMOS chip with TTL

level inputs and outputs. The 8255 can source or sink about 2.5 mA. This is adequate to switch other TTL or

similar inputs, but is inadequate to drive relays, LEDs or solid state relays. The digital I/O is controlled by

programming the 8255's mode register. There are three possible modes. The simplest and most commonly used

mode is mode 0 — simple input and output.

The power up and reset state is jumper-selectable (hardware revision 3 and later). You can also enable a wait

state generator with an on-board jumper.

Software features

For information on the features of InstaCal and the other software included with your CIO-DDA06, refer to the

Quick Start Guide that shipped with your device. The Quick Start Guide is also available in PDF at

www.mccdaq.com/PDFmanuals/DAQ-Software-Quick-Start.pdf

Check www.mccdaq.com/download.htm

for the latest software version.

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Measurement-computing CIO-DDA06 User Manual Page 7