Overview: ADC0803, ADC0804
8-Bit, Microprocessor-patible, A/D Converters
The ADC080X family are CMOS 8-Bit, successive-approximation 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 monmode-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.
Typical Application Schematic ANY PROCESSOR P BUS 1 CS 2 RD V+ 20 +5V 150pF CLK R 19 3 WR CLK IN 4 10K 5 INTR 11 DB7 12 DB6 13 DB5 14 DB4 15 DB3 16 DB2 17 DB1 18 DB0 VIN (+) 6 VIN (-) 7 AGND 8 DIFF INPUTS VREF/2 9 VREF/2 DGND 10 8-BIT RESOLUTION OVER ANY DESIRED
ANALOG INPUT VOLTAGE RANGE DATASHEET FN3094 Rev 4.
