ADC121S101CISD

Analog To Digital Converters (ADC) Overview

The ADC121S101CISD is a single-channel, 12-bit CMOS analog-to-digital converter manufactured by Texas Instruments. It features a successive-approximation register architecture with an internal track-and-hold circuit and operates over a sample rate range of 500 ksps to 1 Msps. The device supports a single power supply from 2.7 V to 5.25 V, consuming 2.0 mW at 3 V and 10 mW at 5 V in normal mode. It utilizes a high-speed serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards. The component is housed in a 6-lead WSON package (suffix CISD) and is specified for operation across a temperature range of –40°C to +125°C.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with DNL of +0.5/-0.3 LSB (typical) and INL of ±0.40 LSB (typical)
• Sample rates fully specified from 500 ksps to 1 Msps
• Single supply operation from 2.7 V to 5.25 V with shutdown power consumption as low as 2.6 µW
• 6-lead WSON package with exposed pad for thermal management

Analog To Digital Converters (ADC) Applications

• Portable systems
• Remote data acquisition
• Instrumentation and control systems
• Automotive applications

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix CISD corresponds to the 6-lead WSON package variant. Confirm that the center pad connection to ground is implemented per datasheet recommendations for this specific package type. Ensure the design accounts for the digital input voltage limit of 5.25 V regardless of the analog supply voltage.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 12-bit SAR ADC with throughput up to 1 Msps is required in a small footprint. The CISD suffix indicates the WSON package, which offers lower thermal resistance compared to SOT-23 variants. Consider the 5.25 V digital input tolerance if interfacing with higher voltage logic without level shifting.

Analog To Digital Converters (ADC) Part Context

The ADC121S101 is part of a family of pin-compatible devices including the ADC121S021 and ADC121S051, which offer lower maximum sample rates. The CISD suffix specifically identifies the WSON package version, distinct from the SOT-23 package versions like CIMF or CISN.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible alternatives include the ADC121S021 (50–200 ksps), ADC121S051 (200–500 ksps), and other resolutions such as the ADC101S101 or ADC081S101. All listed alternatives are functionally compatible.