ADC12138CIWMX/NOPB

Analog To Digital Converters (ADC) Overview

The ADC12138CIWMX/NOPB is a self-calibrating, 12-bit plus sign successive approximation analog-to-digital converter (ADC) featuring an integrated eight-channel configurable multiplexer and sample/hold circuit. It operates on a single supply voltage ranging from 3.0 V to 5.5 V. The device supports serial I/O protocols including MICROWIRE, SPI, and QSPI-compatible interfaces. Key electrical specifications include a maximum conversion time of 8.8 μs, a throughput rate of approximately 71.4 kSPS, and a maximum integral linearity error of ±2 LSB after self-calibration. Power consumption is specified at a maximum of 33 mW under a +5V supply.

Analog To Digital Converters (ADC) Feature Summary

• Integrated 8-channel analog multiplexer with programmable acquisition time
• Self-calibration process adjusts linearity, zero, and full-scale errors
• Supports MICROWIRE, SPI, and QSPI-compatible serial communication
• Configurable digital output word length and format

Analog To Digital Converters (ADC) Applications

• Pen-based computers
• Digitizers
• Global positioning systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific package configuration for the CIWMX suffix against current Texas Instruments availability lists, as certain product-package combinations within this family may be obsolete. Confirm RoHS compliance status associated with the NOPB suffix prior to finalizing procurement orders.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC12138 variant specifically when an eight-channel input multiplexer is required, distinguishing it from the two-channel ADC12130 or the four-channel ADC12132. Ensure the system clock frequency remains within the 1 MHz to 5 MHz range to maintain specified timing parameters and accuracy limits.

Analog To Digital Converters (ADC) Part Context

This component belongs to the ADC1213x family of low-power, high-speed data converters. The ADC12138 distinguishes itself by providing an expanded eight-channel multiplexer compared to the ADC12130's two channels. All variants share identical core ADC architecture, serial interface capabilities, and self-calibration mechanisms.

Analog To Digital Converters (ADC) Replacement Considerations

Direct functional substitutes within the same family include the ADC12130CIWMX/NOPB and ADC12132CIWMX/NOPB, provided the channel count requirements align with the application design.

Analog To Digital Converters (ADC) FAQ

What is the maximum operating speed of the ADC12138?

The device supports a maximum conversion clock (CCLK) and serial data clock (SCLK) frequency of 5 MHz.

How does the self-calibration feature affect accuracy?

The self-calibration process adjusts linearity, zero, and full-scale errors to typically less than ±1 LSB each, with a maximum repeatability uncertainty of 0.2 LSB.

Can the ADC12138 operate with a 3.3V supply?

Yes, the device operates on a single supply voltage ranging from 3.0 V to 5.5 V, making it compatible with 3.3V systems.