Current source referenced high speed analog to digitial converter

An architecture for a high speed analog current to digital voltage converter particularly suited for integrated circuit applications. As preferably implemented, an analog signal of current form and an associated reference current are generated on a source integrated chip. The reference current line and one or more analog current lines transmit data between the source and a receiving integrated circuit chips. The high speed converter utilizes current mirrors to simultaneously evaluate the analog inputs and determine the digital equivalents through current comparisons using currents derived from the reference current. The architecture provides for switching of current sources in lower order bits responsive to the detection of input currents enabling higher order bits. Since switching of lower order bits by higher order bits is accomplished simultaneously, the analog current to digital voltage conversion is accomplished within one switch period while retaining the relatively high accuracy.