Single-supply IC digital-to-analog converter for use with microp

Details Single-supply IC digital-to-analog converter for use with microp Single-supply IC digital-to-analog converter for use with microp

1982-03-22

1985-09-24

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, 340347CL, 330257, 330288, H03K 1302

Patent

active

045435618

ABSTRACT:
A single-chip 8-bit DAC with bipolar current sources, an output buffer amplifier for developing an output voltage, a regulated reference for producing a calibrated output, and operated by a single-voltage supply, e.g. +5 volts. The buffer amplifier includes means providing for driving the output voltage virtually to ground level when the DAC output is zero. The current sources comprise a single-transistor cell driven by an I.sup.2 L flip-flop circuit, and the reference supply is merged with the reference transistor circuit regulating the DAC current levels, both aiding in reducing required chip area. A highly efficient bias network is utilized to supply the high-level bias currents required.

REFERENCES:
patent: 3660773 (1972-05-01), Free
patent: 3836907 (1974-09-01), Nercessian
patent: 3890611 (1975-06-01), Pastoriza
patent: 4231020 (1980-10-01), Azzis
Grant, Putting the AD558 Dacport.TM. on the Bus, Analog Dialogue, 14-2, 1980, pp. 16-17.
Clark, D/A Conversion with Single-Supply Circuit, Analog Dialogue, 10-1, 1976.
Amazeen et al., A Complete Single-Supply Microprocessor-Compatible--, IEEE Journal of Solid-State Circuits, vol. SC-15, No. 6, 12/1980, pp. 1059-1070.
Widlar, Low Voltage Techniques, IEEE Journal of Solid-State Circuits, vol. SC-13, No. 6, 12/1978, pp. 838-846.

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