The ADC0803 and ADC0805 are CMOS 8-bit, successive-approximation, analog-to-digital converters that use a modified potentiometric (256R) ladder. These devices are designed to operate from common microprocessor control buses with the 3-state output latches driving the data bus. The devices can be made to appear to the microprocessor as a memory location or an I/O port. Detailed information on interfacing to most popular microprocessors is readily available from the factory.
●A differential analog voltage input allows increased common-mode rejection and offset of the zero-input analog voltage value. Although a reference input (REF/2) is available to allow 8-bit conversion over smaller analog voltage spans or to make use of an external reference, ratiometric conversion is possible with the REF/2 input open. Without an external reference, the conversion takes place over a span from VCC to ANLG GND. The devices can operate with an external clock signal or with an additional resistor and capacitor, using an on-chip clock generator.
●The ADC0803C and ADC0805C are characterized for operation from 0°C to 70°C. The ADC0803I and ADC0805I are characterized for operation from \x9640°C to 85°C.
● 8-Bit Resolution
● Ratiometric Conversion
● 100-us Conversion Time
● 135-ns Access Time
● Guaranteed Monotonicity
● High Reference Ladder Impedance 8 k Typical
● No Zero Adjust Requirement
● On-Chip Clock Generator
● Single 5-V Power Supply
● Operates With Microprocessor or as Stand-Alone
● Designed to Be interchangeable With National Semiconductor and Signetics ADC0803 and ADC0805
