ADC121C021QIMKX/NOPB

Analog To Digital Converters (ADC) Overview

The ADC121C021QIMKX/NOPB is a low-power, monolithic 12-bit analog-to-digital converter (ADC) based on a successive approximation register architecture. It operates from a single +2.7V to +5.5V supply and features an I²C-compatible serial interface supporting standard (100kHz), fast (400kHz), and high-speed (3.4MHz) modes. The device includes an internal track-and-hold circuit capable of handling input frequencies up to 11MHz. Key specifications include a maximum throughput rate of 188.9 ksps, typical conversion time of 1µs, and integral/differential non-linearity of ±1 LSB at speeds up to 22ksps. Power consumption is 0.26mW at 3V and 0.78mW at 5V during normal operation.

Analog To Digital Converters (ADC) Feature Summary

• I²C-Compatible Interface: Supports Standard, Fast, and High Speed modes for flexible communication rates.
• 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 significantly while not converting.
• Automotive Grade Qualification: AEC-Q100 Grade 2 qualified for automotive applications.

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify that the ordering suffix IMKX corresponds to the specific package variant required for your design. Confirm the component meets AEC-Q100 Grade 2 standards if used in automotive contexts. Ensure the I²C bus capacitance does not exceed 400pF to maintain signal integrity at high speeds. Check for RoHS compliance and lead-free status as indicated by the NOPB suffix.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring a small footprint and low power consumption with I²C connectivity. Consider the ADC121C021QIMKX/NOPB when automotive reliability is necessary. Compare against the ADC121C021 if address selection inputs are not needed, or the ADC121C027 if pin-selectable addresses are preferred over alert functionality.

Analog To Digital Converters (ADC) Part Context

This part belongs to the Texas Instruments ADC121C021 family, which also includes 8-bit (ADC081C021) and 10-bit (ADC101C021) variants. These devices share pin compatibility and functional similarities, allowing for easy upgrades or downgrades in resolution without changing the PCB layout. The Q suffix denotes automotive qualification.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible alternatives within the same family include the ADC121C021CIMKX/NOPB (non-automotive) and the ADC121C027 series (different address/alert configuration). For different resolutions, consider the ADC101C021 or ADC081C021 families.

Analog To Digital Converters (ADC) FAQ

What is the maximum sampling rate supported by the ADC121C021Q?

The maximum throughput rate is 188.9 ksps, achieved when operating with a serial clock frequency of 3.4MHz.

How does the automatic power-down mode function?

The device automatically enters power-down mode when not actively converting, reducing power consumption to less than 1µW. This feature helps extend battery life in portable applications.

What is the purpose of the ALERT pin?

The ALERT pin provides an interrupt signal when the analog input voltage exceeds or falls below the programmable upper or lower limit thresholds set in the Alert Limit Registers.