The HI3304 is a 25 MSPS, 4-bit analog-to-digital converter. It obtains its high speed operability by implementing a sequential parallel conversion technique. One clock cycle is required for each conversion. This is achieved by having two phases during the conversion process, the “Auto Balance” phase during the low period of the clock and the “Sample Unknown” phase during the high period of the cycle. For a complete technical discussion of the architecture and timing of the converter, please refer to the HI3304 data sheet, available in the Data Acquisition Products Data Book or it can be found on the world wide web at