ADC0803LCN

Analog To Digital Converters (ADC) Overview

The ADC0803LCN is a CMOS 8-bit successive approximation analog-to-digital converter (ADC) from Texas Instruments. It features differential analog voltage inputs, an on-chip clock generator, and tri-state output latches for direct microprocessor bus interfacing. The device operates with a single 5-V supply and supports a 0-V to 5-V analog input range without requiring zero adjustment. Key electrical specifications include a maximum conversion time of 100 µs at a 640 kHz clock frequency and a total adjusted error of ±1/2 LSB. It is housed in a standard 20-pin PDIP package.

Analog To Digital Converters (ADC) Feature Summary

• CMOS 8-bit SAR architecture with differential potentiometric ladder
• Tri-state outputs compatible with TTL and MOS logic levels
• On-chip clock generator using external RC components
• Differential analog inputs for improved common-mode rejection

Analog To Digital Converters (ADC) Applications

• Transducer-to-microprocessor interface
• Digital thermometer systems
• Microprocessor-based monitoring and control systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the operating temperature range matches system requirements; the ADC0803LCN variant is rated for 0°C to +70°C. Confirm that the application circuit provides a stable 5V supply within the 4.5V to 6.3V recommended operating conditions. Ensure proper grounding of the separate Analog Ground (AGND) and Digital Ground (DGND) pins to maintain signal integrity.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC0803LCN when differential analog inputs are required to offset zero-input voltage or improve noise immunity compared to single-ended variants like the ADC0804. Choose this part over the ADC0801 if ±1/2 LSB accuracy is sufficient, as the ADC0801 offers higher ±1/4 LSB precision. Ensure the design accommodates the 20-pin DIP footprint and allows space for external clock timing resistors and capacitors.

Analog To Digital Converters (ADC) Part Context

The ADC0803LCN belongs to the ADC080x family of 8-bit, µP-compatible analog-to-digital converters manufactured by Texas Instruments. This series includes variants such as the ADC0801, ADC0802, ADC0804, and ADC0805, which differ primarily in accuracy specifications and input configurations. The ADC0803 specifically provides differential inputs and ±1/2 LSB total adjusted error, bridging the gap between the high-precision ADC0801 and the simpler single-ended ADC0804.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.