Serial interface for an analog to digital converter and a converter including such an interface
AssigneeAnalog Devices, Inc.
InventorsMichael Mueck, David Gerrard Laing, Alain Valentin Guery
Life of this patent
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Abstract
An analog to digital converter is provided which has a compact serial interface utilising only four pins to define chained and non chained modes of operation. Further more the interface also allows the converter to be configured to indicate immediately that the conversion has been completed. Another variant of the invention enables an analog to digital converter to be provided having only a 3 pin serial interface.
Claims51
An analog to digital converter comprising a converter section and an interface section, the interface section having a first input and an output from which a digital word representing the result of the conversion can be read, and wherein in a first mode of operation the output is placed into a predetermined output state to signal that the conversion has been completed, and in which the first mode is selected by placing the first input into a first predetermined state before the conversion is complete.
An analog to digital converter comprising a converter section and an interface section, the interface section having a first input and an output for outputting the result of a conversion, and wherein in a first mode the output is asserted to a first predetermined state to indicate that a conversion has been completed when the conversion has been completed and the first input is at a first predetermined state.
A serial interface for a task performing device wherein the device will complete the task after an unspecified duration but within a predetermined maximum duration, and wherein the serial interface comprises a serial clock input, a serial output and a control input and the interface is arranged such that a first transition of the control input initiates the task, and a further transition of the control input prior to completion of the task instructs the serial interface to assert a signal on the serial output once the task has been completed.
Dependencies are inferred from the claim text.