This device is a 7th order sigma-delta modulator that convertsthe analog input signal into a high speed 1-bit data stream. Thepart operates from a +5 V supply and accepts a differential inputrange of 0 V to +2.5 V or ±1.25 V centered about a commonmodebias. The analog input is continuously sampled by theanalog modulator, eliminating the need for external sample andhold circuitry. The input information is contained in the outputstream as a density of ones. The original information can bereconstructed with an appropriate digital filter.The part provides an accurate on-chip 2.5 V reference. A referenceinput/output function is provided to allow either the internalreference or an external system reference to be used as thereference source for the part.The device is offered in a 28-lead TSSOP package and designedto operate from –40°C to +85°C.
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