SNOSBI1C November   2009  – June 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Operating Ratings
    6. 6.6 Electrical Characteristics
    7. 6.7 AC Electrical Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Tri-State Test Circuits and Waveforms
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Understanding ADC Error Specs
      2. 8.3.2 Digital Control Inputs
    4. 8.4 Device Functional Modes
      1. 8.4.1 Analog Input Modes
        1. 8.4.1.1 Normal Mode
        2. 8.4.1.2 Fault Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Testing the ADC Converter
      2. 9.1.2 Microprocessor Interfacing
        1. 9.1.2.1 Interfacing 8080 Microprocessor Derivatives (8048, 8085)
        2. 9.1.2.2 Sample 8080A CPU Interfacing Circuitry and Program
        3. 9.1.2.3 INS8048 Interface
        4. 9.1.2.4 Interfacing the Z-80
        5. 9.1.2.5 Interfacing 6800 Microprocessor Derivatives (6502, etc.)
    2. 9.2 Typical Applications
      1. 9.2.1 8080 Interface
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Analog Differential Voltage Inputs and Common-Mode Rejection
          2. 9.2.1.2.2 Analog Inputs — Input Current
            1. 9.2.1.2.2.1 Input Bypass Capacitors
            2. 9.2.1.2.2.2 Input Source Resistance
            3. 9.2.1.2.2.3 Noise
          3. 9.2.1.2.3 Reference Voltage
            1. 9.2.1.2.3.1 Span Adjust
            2. 9.2.1.2.3.2 Reference Accuracy Requirements
          4. 9.2.1.2.4 Errors and Reference Voltage Adjustments
            1. 9.2.1.2.4.1 Zero Error
            2. 9.2.1.2.4.2 Full-Scale
            3. 9.2.1.2.4.3 Adjusting for an Arbitrary Analog Input Voltage Range
          5. 9.2.1.2.5 Clocking Option
          6. 9.2.1.2.6 Restart During a Conversion
          7. 9.2.1.2.7 Continuous Conversions
          8. 9.2.1.2.8 Driving the Data Bus
          9. 9.2.1.2.9 Wiring and Hook-Up Precautions
      2. 9.2.2 Multiple ADC0801 Series to MC6800 CPU Interface
      3. 9.2.3 Auto-Zeroed Differential Transducer Amplifier and ADC Converter
      4. 9.2.4 Multiple ADC Converters in a Z-80 Interrupt Driven Mode
    3. 9.3 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

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 VDC, 2.5 VDC, 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.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
ADC0801, ADC0803 PDIP (20) 26.073 mm × 6.604 mm
ADC0802, ADC0804 PDIP (20) 26.073 mm × 6.604 mm
SOIC (20) 12.80 mm × 7.50 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 00567101.gif

ADC0801 Specified With ±¼ LSB Accuracy

ADC0801 ADC0802 ADC0803 ADC0804 ADC0805 00567184.gif