The AD ADC84/AD ADC85 series devices are high speed, low cost 12-bit successive approximation analog-to-digital converters that include an internal clock, reference, and comparator. Its hybrid IC design utilizes MSI digital and linear monolithic chips in conjunction with a 12-bit monolithic DAC to provide modular performance and versatility with IC size, price, and reliability. Important performance characteristics of the AD ADC84/ AD ADC85 series include maximum linearity error of 0.012%; gain TC below 15 ppm/C at 25C; typical power dissipation of 880 mW; and conversion time of less than 10 s for the 12-bit versions. Of considerable significance in severe and aerospace applications is the guaranteed performance from 55C to +125C of the AD ADC85S, which is also available with environmental screening. Monotonic operation of the feedback DAC guarantees no missing codes over temperature ranges of 0C to +70C, 25C to +85C, and 55C to +125C.