ADC12038CIWM

Analog To Digital Converters (ADC) Overview

The ADC12038CIWM is a self-calibrating 12-bit plus sign successive approximation analog-to-digital converter (ADC) manufactured by Texas Instruments. It features an integrated multiplexer with eight differential or single-ended input channels and a sample/hold function. The device operates on a single +5V supply, consuming a maximum of 33 mW. It supports serial I/O compatible with MICROWIRE protocols and allows for variable resolution and conversion rates. Key electrical specifications include a maximum throughput time of 14 µs for the ADC12030 family and an integral linearity error of ±1 LSB after auto-calibration.

Analog To Digital Converters (ADC) Feature Summary

• Self-Calibrating Architecture: Automatically adjusts linearity, zero, and full-scale errors to less than ±1 LSB without external adjustment components.
• Integrated Multiplexer: Includes an 8-channel multiplexer supporting differential, pseudo-differential, and single-ended input configurations.
• Flexible Serial Interface: Compatible with NSC MICROWIRE standards, featuring programmable acquisition time and digital output word length.
• Single Supply Operation: Designed for a +4.5V to +5.5V power supply range with a 0V to 5V analog input span.

Analog To Digital Converters (ADC) Applications

• Medical Instruments
• Process Control Systems
• Test Equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify component availability status as the datasheet indicates some devices in this family may be obsolete or on Lifetime Buy status. Confirm package type (SOIC-20) and temperature grade (Industrial -40°C to +85°C) match design requirements. Ensure proper bypassing of VA+ and VD+ pins to maintain specified accuracy.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC12038CIWM for applications requiring 8-channel signal acquisition with high linearity. Choose this part over the ADC12H038 if a lower maximum clock frequency (5 MHz vs 8 MHz) is acceptable. Ensure the system can accommodate the required serial interface timing and that the reference voltage source impedance remains below 25Ω for optimal performance.

Analog To Digital Converters (ADC) Part Context

The ADC12038CIWM belongs to the ADC1203x family of 12-bit plus sign serial I/O ADCs. It shares architectural similarities with the ADC12030, ADC12032, and ADC12034, differing primarily in the number of multiplexer channels. It is distinct from the ADC12H03x series, which offers higher clock speeds up to 8 MHz compared to the 5 MHz limit of the ADC1203x series.

Analog To Digital Converters (ADC) Replacement Considerations

Direct substitutes within the same family include the ADC12030, ADC12032, and ADC12034, provided the channel count matches the application needs. For higher speed requirements, the ADC12H038 is a functional alternative with an 8 MHz clock capability. Verify pin compatibility and thermal resistance differences when substituting.