ADC12138CIWM

Analog To Digital Converters (ADC) Overview

The ADC12138CIWM is a self-calibrating, 12-bit plus sign successive approximation analog-to-digital converter (ADC) featuring an integrated eight-channel multiplexer and sample-and-hold circuit. It operates on a single 3.3V or 5V supply with an analog input range of 0V to 5V. The device supports serial I/O compatible with MICROWIRE, SPI, and QSPI protocols. Key electrical specifications include a maximum conversion time of 8.8 μs, a throughput time of 14 μs, and an integral linearity error of ±2 LSB after auto-calibration. It is housed in a 20-pin SSOP package.

Analog To Digital Converters (ADC) Feature Summary

• Integrated 8-channel configurable analog multiplexer with sample-and-hold functionality
• Self-calibrating architecture that adjusts linearity, zero, and full-scale errors
• Serial interface compatible with MICROWIRE, SPI, and QSPI standards
• Programmable acquisition time and variable digital output word length

Analog To Digital Converters (ADC) Applications

• Pen-based computers
• Digitizers
• Global positioning systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix for package type and RoHS compliance against current manufacturer documentation. Confirm availability status as older revisions may be obsolete. Ensure power supply decoupling capacitors are placed close to VA+ and VD+ pins to maintain specified accuracy levels during operation.

Analog To Digital Converters (ADC) Selection Notes

Select this component when an 8-channel input multiplexer is required alongside 12-bit resolution. Verify that the system clock frequency falls within the 1 MHz to 5 MHz range for CCLK and SCLK inputs. Ensure the analog source impedance does not exceed 25Ω to meet specified DC accuracy parameters.

Analog To Digital Converters (ADC) Part Context

This part belongs to the ADC1213x family, which includes the ADC12130 (2-channel) and ADC12132 (2-channel). The ADC12138 specifically provides eight multiplexed channels. All variants share identical core ADC performance characteristics but differ in channel count and pin configurations.

Analog To Digital Converters (ADC) Replacement Considerations

Direct substitutes within the same family include the ADC12130 and ADC12132, though these offer fewer input channels. Cross-family replacements require verification of pin compatibility and interface protocol support.