Using an innovative, patented multistep* conversion technique, the 10-bit ADC10662 and ADC10664 are 2- and 4-input CMOS analog-to-digital converters offering sub-microsecond conversion times yet dissipating a maximum of only 235 mW. The ADC10662 and ADC10664 perform a 10-bit conversion in two lower-resolution "flashes", thus yielding a fast A/D without the cost, power dissipation, and other problems associated with true flash approaches. In addition to standard static performance specifications (Linearity, Full-Scale Error, etc.) dynamic performance (THD, S/N) is guaranteed. The analog input voltage to the ADC10662 and ADC10664 is sampled and held by an internal sampling circuit. Input signals at frequencies from dc to over 250 kHz can therefore be digitized accurately without the need for an external sample-and-hold circuit. The ADC10662 and ADC10664 include a "speed-up" pin. Connecting an external resistor between this pin and ground reduces the typical conversion time to as little as 360 ns. For ease of interface to microprocessors, the ADC10662 and ADC10664 have been designed to appear as a memory location or I/O port without the need for external interface logic. |