Patent ID: 6456219
Filing Date: 2002-09-24
Classification: H03M

Abstract:
An analog-to-digital converter comprising:(a) a delta sigma modulator adapted to produce a stream of pulses the density of which represents the amplitude of an analog input signal coupled to an input of the delta sigma modulator; (b) a decimation filter coupled to filter the stream of pulses and produce a digital word representing the amplitude of the analog input signal; (c) a serial interface circuit coupled to receive the bits of the digital word and serially shift the bits of the digital word to a single data terminal; (d) a timing generator operative in response to a clock signal to produce timing signals to control operation of the delta sigma modulator and the decimation filter, the timing generator also producing a conversion done signal indicative of completion of conversion of the analog input signal into the digital word; and (e) a control circuit operative in response to the conversion done signal to produce a data ready signal on the data terminal and also operative in response to a single digital control signal to cause the serial interface circuit to serially shift the bits of the digital word onto the data terminal, wherein two-wire communication with the analog-to-digital converter is accomplished by the single data terminal and the single digital control signal.