ADC0804LCJ

Analog To Digital Converters (ADC) Overview

The ADC0804LCJ is an 8-bit successive approximation analog-to-digital converter (ADC) manufactured by Texas Instruments. It features a differential potentiometric ladder architecture and operates on a single +5V supply. The device provides tri-state data outputs compatible with standard microprocessor buses, requiring no additional interfacing logic. Key electrical specifications include a conversion time of approximately 100 µs at a clock frequency of 640 kHz, an unadjusted total error of ±1 LSB, and an analog input voltage range spanning from ground to VCC. The component is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package.

Analog To Digital Converters (ADC) Feature Summary

• 8-bit resolution with a differential analog input structure for improved common-mode rejection.
• Integrated on-chip clock generator allowing operation with external RC components or an external clock source.
• Tri-state digital outputs that interface directly with microprocessor data buses without extra logic.
• Operates within a -40°C to +85°C temperature range.

Analog To Digital Converters (ADC) Applications

• Interface connections between microprocessors and analog sensors such as temperature transducers.
• Data acquisition systems requiring direct connection to voltage sources.
• Stand-alone analog-to-digital conversion tasks in embedded control circuits.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix LCJ corresponds to the industrial temperature grade (-40°C to +85°C) and SOIC-20 package configuration. Confirm availability status through authorized distributors, as legacy components may have limited production runs. Ensure the design accounts for the specific internal reference resistor values associated with this variant during schematic capture.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC0804LCJ when an 8-bit resolution and parallel interface are required for low-speed applications. This model is suitable for designs needing a wide operating temperature range compared to commercial variants. Designers must ensure the analog input does not exceed VCC by more than 50 mV to prevent parasitic diode conduction errors. Verify that the system clock frequency remains within the specified limits to maintain conversion accuracy.

Analog To Digital Converters (ADC) Part Context

This component belongs to the ADC080x family, which includes the ADC0801, ADC0802, ADC0803, and ADC0805. These devices share a common pinout and functional architecture but differ in accuracy grades and reference configurations. The ADC0804 specifically offers an unadjusted error of ±1 LSB and utilizes a specific internal reference resistor network distinct from other family members.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same family include the ADC0804LCN (commercial temperature range) and ADC0804LCWM. For modern upgrades, consider higher-resolution or serial-interface alternatives, though these will require significant circuit redesign.