Selectable reference voltage circuit for a digital-to-analog con

Details Selectable reference voltage circuit for a digital-to-analog con Selectable reference voltage circuit for a digital-to-analog con

1997-08-21

1999-03-23

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

327 1, H03M 166

Patent

active

058866574

ABSTRACT:
A selectable reference voltage circuit for a digital-to-analog converter (DAC) which includes an input terminal for receiving an external reference voltage, a voltage comparator having two inputs and an output, one input for receiving the reference voltage and the other for receiving a predetermined voltage, the comparator providing one of two possible output voltages based upon the relationship of the magnitudes of the reference voltage and the predetermined voltage. The circuit includes a multiplexer having a control input coupled to receive as an input signal the output of the comparator, and having two inputs for receiving input voltage signals, one for receiving the voltage on the reference voltage input terminal and the other for receiving an on-chip generated reference voltage, the multiplexer selecting as an output voltage one of the two input voltages determined by the input signal at its control input. When there is a reference voltage at the reference voltage input terminal of the DAC, that voltage is supplied at the output of the multiplexer and used as the reference voltage for the DAC. When there is no reference voltage at the reference voltage input terminal of the DAC, the internally generated reference voltage is supplied at the output of the multiplexer and is used as the reference voltage of the DAC.

REFERENCES:
patent: 3653037 (1972-03-01), Utley
patent: 4752700 (1988-06-01), Boyaciqiller
patent: 4797569 (1989-01-01), Boyaciqiller
patent: 5532618 (1996-07-01), Hardee et al.
patent: 5619461 (1997-04-01), Roohparvar
patent: 5719524 (1998-02-01), Mo et al.

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