ADC0803

® ADC0803, ADC0804 Data Sheet August 2002 FN3094.4 8-Bit, Microprocessor-Compatible, A/D Converters The ADC080X family are CMOS 8-Bit, successiveapproximation A/D converters which use a modified potentiometric ladder and are designed to operate with the 8080A control bus via three-state outputs. These converters appear to the processor as memory locations or I/O ports, and hence no interfacing logic is required. The differential analog voltage input has good commonmode-rejection and permits offsetting the analog zero-inputvoltage value. In addition, the voltage reference input can be adjusted to allow encoding any smaller analog voltage span to the full 8 bits of resolution. Features 80C48 and 80C80/85 Bus Compatible - No Interfacing Logic Required Conversion Time . . . . . . . . . . . . . . . . . . . . . . . . . . <100µs Easy Interface to Most Microprocessors Will Operate in a “Stand Alone” Mode Differential Analog Voltage Inputs Works with Bandgap Voltage References TTL Compatible Inputs and Outputs On-Chip Clock Generator Analog Voltage Input Range (Single + 5V Supply) . . . . . . . . . . . . . . . . . . . . . . 0V to 5V No Zero-Adjust Required 80C48 and 80C80/85 Bus Compatible - No Interfacing Logic Required Typical Application Schematic 1 2 3 5 11 µP BUS ANY µPROCESSOR 12 13 14 15 16 17 18 CS RD WR INTR DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 V+ 20 +5V 150pF CLK R 19 CLK IN 4 10K Pinout ADC0803, ADC0804 (PDIP) TOP VIEW VIN (+) 6 V (-) 7 AGND 8 /2 9...