Analog-to-digital converter apparatus for condition responsive t

Details Analog-to-digital converter apparatus for condition responsive t Analog-to-digital converter apparatus for condition responsive t

1980-06-02

1984-11-20

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347CC, H03K 1302

Patent

active

044841779

ABSTRACT:
An analog signal representing the measured output of a condition responsive transducer is supplied to a dual slope integrating analog-to-digital converter also receiving a regulated constant reference signal. Using the integrator in a non-inverting mode, the A/D converter operates in a single conversion cycle by first positively integrating a value of analog signal below a maximum negative input voltage for a fixed time period and then negatively integrating a voltage signal corresponding to the differential between the reference voltage signal and the maximum voltage for a variable time period to a comparative threshold. During integration, digital counts proportional to the variable integration period are accumulated and emitted for operating a digital device such as a digital display.
Digital linearization of the converter output can optionally be provided by use of a programmed microcomputer reading a programmable-read-only-memory (PROM) to run a variable frequency clock. The clock is regulated to effect a frist phase converter time corresponding with an even multiple of the power line frequency.

REFERENCES:
patent: 3617885 (1971-11-01), Wheable
patent: 3654560 (1972-04-01), Cath
patent: 3939459 (1976-02-01), Hoopes
patent: 3942173 (1976-03-01), Wold
patent: 3979745 (1976-09-01), Bishop
patent: 4063236 (1977-12-01), Amemiya
Product Literature of National Semiconductor Corp., "ADB4500 41/2 Digit A/D Building Block", Apr. 1977, pp. 1-8.

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