ADC121C021CIMK

Analog To Digital Converters (ADC) Overview

The ADC121C021CIMK is a low-power, monolithic 12-bit analog-to-digital converter (ADC) manufactured by Texas Instruments. It operates from a single +2.7V to +5.5V supply and utilizes a successive approximation register (SAR) architecture with an internal track-and-hold circuit capable of handling input frequencies up to 11MHz. The device features an I²C-compatible 2-wire serial interface supporting standard (100kHz), fast (400kHz), and high-speed (3.4MHz) modes. Key specifications include a maximum throughput rate of 188.9 ksps, integral non-linearity (INL) and differential non-linearity (DNL) of ±1 LSB, and power consumption as low as 0.26mW at 3V. It includes an out-of-range alert function and automatic power-down mode.

Analog To Digital Converters (ADC) Feature Summary

• I²C-Compatible Interface: Supports Standard (100kHz), Fast (400kHz), and High Speed (3.4MHz) modes for flexible communication.
• Out-of-Range Alert Function: Provides an interrupt when the analog input violates programmable upper or lower limit values.
• Automatic Power-Down Mode: Reduces power consumption to less than 1µW while not converting, extending battery life in portable applications.
• Small Package Options: Available in 6-pin SOT and 8-pin VSSOP packages to save board space.

Analog To Digital Converters (ADC) Applications

• System Monitoring
• Peak Detection
• Portable Instruments
• Medical Instruments
• Test Equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix 'CIMK' against the manufacturer's current datasheet to confirm package type (SOT-23-6) and temperature range (-40°C to +105°C). Ensure compatibility with the required I²C bus speed and voltage levels (2.7V to 5.5V). Check for availability of pin-compatible alternatives like ADC121C027 if address selection inputs are needed instead of alert outputs.

Analog To Digital Converters (ADC) Selection Notes

Select the ADC121C021CIMK when a 12-bit resolution with I²C interface is required in a small footprint. Choose this part over the ADC121C027 if the alert output functionality is preferred over additional address selection pins. Consider the ADC121C021Q variant if automotive qualification (AEC-Q100 Grade 2) is necessary for the application environment.

Analog To Digital Converters (ADC) Part Context

The ADC121C021 is part of a family of pin-compatible ADCs that also includes 8-bit (ADC081C021) and 10-bit (ADC101C021) resolutions. It shares the same 6-pin SOT and 8-pin VSSOP packages as the ADC121C027, which offers three pin-selectable addresses but lacks the alert output. This family allows for easy migration between resolution requirements without changing the PCB layout.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible alternatives within the same family include the ADC121C027 (different pinout configuration for address vs. alert), ADC101C021, and ADC081C021. For automotive applications, the ADC121C021Q is the qualified alternative. Verify that any substitute maintains the required I²C speed and power consumption characteristics.