Texas Instruments' ADC081C021 and ADC081C027 are low-power, monolithic, 8-bit, analog-to-digital converters (ADCs) that operate from a 2.7 V to 5.5 V supply. The converters are based on a successive approximation register architecture with an internal track-and-hold circuit that can handle input frequencies up to 11 MHz. The ADC081C021 and ADC081C027 operate from a single supply which also serves as the reference. These devices feature an I²C-compatible serial interface that operates in all three speed modes, including high-speed mode (3.4 MHz).

The ADC's alert feature provides an interrupt that is activated when the analog input violates a programmable upper or lower limit value. The devices feature an automatic conversion mode, which frees up the controller and I²C interface. In this mode, the ADC continuously monitors the analog input for an "out-of-range" condition and provides an interrupt if the measured voltage goes out-of-range.

The ADC081C021 comes in two packages: a small SOT-6 package with an alert output, and a VSSOP-8 package with an alert output, and two address selection inputs. The ADC081C027 comes in a small SOT-6 package with an address selection input. The ADC081C027 provides three pin-selectable addresses while the VSSOP-8 version of the ADC081C021 provides nine pin-selectable addresses. Pin-compatible alternatives to the SOT-6 options are available with additional address options.