ADC0808: 8-bit Analog to Digital Converter

The ADC0808 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses successive approximation as the conversion technique. The converter features a high impedance chopper stabilized comparator, a 256R voltage divider with analog switch tree and a successive approximation register. The 8-channel multiplexer can directly access any of 8-single-ended analog signals. The device eliminates the need for external zero and full-scale adjustments. Easy interfacing to microprocessors is provided by the latched and decoded multiplexer address inputs and latched TTL TRI-STATE outputs. The design of the ADC0808 has been optimized by incorporating the most desirable aspects of several A/D conversion techniques. The ADC0808 offers high speed, high accuracy, minimal temperature dependence, excellent long-term accuracy and repeatability, and cnsumes minimal power. These features make this device ideally suited to applications from process and machine control to consumer and automotive applications.

Features of ADC 0808

• Easy interface to all microprocessors
  
• Operates ratio metrically or with 5 VDC or analog span adjusted voltage reference
  
• No zero or full-scale adjust required
  
• 8-channel multiplexer with address logic
  
• 0V to 5V input range with single 5V power supply  
  
• Outputs meet TTL voltage level specifications
  
• Standard hermetic or molded 28-pin DIP package
  
• 28-pin molded chip carrier package
  
• ADC0808 equivalent to MM74C949

Key Specifications ADC0808

• Resolution: 8 Bits
  
• Total Unadjusted Error  ±1⁄2LSB and±1 LSB
  
• Single Supply 5 VDC
  
• Low Power 15 mW
  
• Conversion Time 100 µs