System for converting analog signals to multiplexed digital data

Details System for converting analog signals to multiplexed digital data System for converting analog signals to multiplexed digital data

1978-06-16

1980-02-12

Sloyan, Thomas J.

Communications: electrical

Digital comparator systems

364900, 179 15R, G08C 1506

Patent

active

041886178

ABSTRACT:
A system for providing digital data representative of a selected analog signal on the data lines of a programmable controller using a central processing unit. The system employs a conversion circuit which converts the input analog signal to digital data on output data terminals upon receipt of a conversion signal simultaneously with an analog signal and which creates a completion signal when the conversion is completed. The system can use at least two analog inputs that receive at least two analog conditions and convert a selected one of the analog conditions to an analog signal. Upon actuation of one of the input modules, the selected analog signal of the selected module is directed to the conversion circuit. After conversion, the conversion completion signal of a conversion circuit then deactivates the actuated input module for the next conversion cycle.

REFERENCES:
patent: 3493731 (1970-02-01), Lemonde
patent: 3653037 (1972-03-01), Utley
patent: 3806916 (1974-04-01), Diaz et al.
patent: 3940759 (1976-02-01), Zitelli et al.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 1972, pp. I-1 to I-7; I-41 to I-53; I-59 to I-61; I-106 to I-19; I-20 to I-37; II-48 to II-50; II-156 to II-163; III-1 to III-9; III-43 to III-45; III-50 to III-61.
Hnatek, A User's Handbook of D/A and A/D Converters, J. Wiley & Sons, 6/76, pp. 395-401.

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