1 Features

• Compatible With 8080-µP Derivatives – No Interfacing Logic Needed – Access Time 135 ns
• Easy Interface to All Microprocessors, or Operates as a Stand-Alone Deivce
• Differential Analog Voltage Inputs
• Logic Inputs and Outputs Meet Both MOS and TTL Voltage-Level Specifications
• Works With 2.5-V (LM336) Voltage Reference
• On-Chip Clock Generator
• 0-V to 5-V Analog Input Voltage Range With Single 5-V Supply
• No Zero Adjust Required
• 0.3-Inch Standard Width 20-Pin DIP Package
• 20-Pin Molded Chip Carrier or Small Outline Package
• Operates Ratiometrically or With 5 V_DC, 2.5 V_DC, or Analog Span Adjusted Voltage Reference
• Key Specifications
  • Resolution: 8 Bits
  • Total Error: ±1/4 LSB, ±1/2 LSB and ±1 LSB
  • Conversion Time: 100 µs

2 Applications

• Operates With Any 8-Bit µP Processors or as a Stand-Alone Device
• Interface to Temp Sensors, Voltage Sources, and Transducers

3 Description

The ADC0801, ADC0802, ADC0803, ADC0804, and ADC0805 devices are CMOS 8-bit successive approximation converters (ADC) that use a differential potentiometric ladder — similar to the 256R products. These converters are designed to allow operation with the NSC800 and INS8080A derivative control bus with Tri-state output latches directly driving the data bus. These ADCs appear like memory locations or I/O ports to the microprocessor and no interfacing logic is needed.

Differential analog voltage inputs allow increasing the common-mode rejection and offsetting the analog zero input voltage 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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

ADC0801 Specified With ±¼ LSB Accuracy