Cirrus Logic Inc.

Saibun Wong

Jerome E Johnston

Douglas F Pastorello

Aryesh Amar

Kartik Nanda

Qicheng Yu

A method and system for selecting implementation of a filter controller between a single conversion that ensures a fully-settled converted output and a continuous conversion of an input signal are disclosed. State machine determines whether convert start signal has a duration, which ends on or before a first occurrence of a conversion done on the input signal. Conversion done is an occurrence of when a bit set has been converted from the input signal. If convert start signal has a duration which ends on or before the first occurrence of conversion done, then state machine selects and implements single conversion of the input signal. Digital system ensures a fully-settled converted output by waiting for the filter to receive and filter a predetermined number of bit sets for a conversion output and then outputting the conversion output. Otherwise, state machine selects and implements continuous conversion of the input signal.

Method and system for selecting implementation of a filter controller between a single conversion mode that ensures a fully-settled converted output and a continuous conversion mode

The present invention provides a method and apparatus to define and sustain such a physical level by connecting the output through a transmission gate to an input pin. For a certain state of the output, one level of an input may be fed through to the output to generate an output voltage level. In the preferred embodiment of the present invention, a chip select signal {overscore (CS)} is used to define a low level logic signal. An control logic selectively switches a high level logic signal voltage (e.g., V&plus;supply voltage) or the low level logic signal voltage ({overscore (CS)}) to produce an output digital logic signal. In a further embodiment of the present invention, separate logic level signals IN and IN may be selectively switched by control logic to generate an output logic level signal independent of supply voltages V&plus; and V&minus;.

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Nashua, NH, United States of America

Saibun Wong