WinSystems PCM-AIO, Operation Manual, Page: 5 / 43

1
GENERAL INFORMATION
1.1
FEATURES
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Low cost, 12- bit A/D
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Up to 8 A/D in put chan nels
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Each A/D chan nel con fig ur able for Uni po lar (0 to +5V) or Bi po lar (-2.5 to +2.5V)
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Single- ended or Dif fer en tial In put Modes
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Built- in Sample- and- Hold
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100KHz sam pling rate
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I/O mapped on the PC/104 Bus
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Proc es sor in de pend ent
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Very low power, all CMOS com po nents
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Two chan nel 12 Bit CMOS D/A con verter
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Se lecta ble UNI PO LAR or BI PO LAR volt age out put for each chan nel
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Two out put volt age ranges: 0 to 5V or -5V to +5V
1.2
GENERAL DESCRIPTION
1.2.1
PC/104 Bus Interface
The PCM- AIO is I/O port mapped with the unique port ad dress de ter mined by an on
board EPAL de coder. The PCM- AIO uses a to tal of 8 I/O ports and is de signed to work with
stan dard NMOS/TTL or CMOS base boards.
1.2.2
Analog to Digital Converter
The PCM- AIO con tains the Maxim MAX180, 12- bit data ac qui si tion sys tem. It com -
bines an 8 chan nel in put mul ti plexer, high band width Track- and- Hold (T/H), low- drift
zener ref er ence, and flexi ble mi cro proc es sor in ter face with a high con ver sion speed, suc -
ces sive ap proxi ma tion ana log to digi tal con verter. The de vice sam ples and dig it izes at a
100KHz through put rate. The MAX180 can be soft ware con fig ured for uni po lar or bi po lar
con ver sions and single- ended or dif fer en tial in puts on a per chan nel ba sis. Out put cod ing
is natu ral bi nary for uni po lar op era tion with 1 LSB = 1.22mV (5V/4096). Cod ing is twos
com ple ment for bi po lar. Po ten ti ome ters are on the card to per mit both gain and off set ad -
just ment.
980723 OPERATIONS MANUAL PCM-AIO Page 1-1