ADS127L21IRUKR

Overview

The ADS127L21IRUKR is a 24-bit delta-sigma analog-to-digital converter in a 20-pin WQFN (3mm × 3mm) package. It features programmable FIR and IIR digital filters supporting wideband modes up to 512kSPS and low-latency modes up to 1365kSPS with 3µs conversion latency. The device offers high AC accuracy, including a typical dynamic range of 111.5dB at 200kSPS and THD of -125dB. DC precision includes an INL of 0.4ppm FSR and offset drift of 50nV/°C. Power consumption scales from 4.3mW at 50kSPS to 33mW at max speed. It operates over a temperature range of –40°C to +125°C.

Feature Summary

• Programmable digital filters allow customization for A-weighting or frequency notch applications.
• Power-scalable architecture optimizes the balance between data rate, resolution, and power consumption.
• Buffered signal and reference inputs reduce driver loading to enhance measurement accuracy.
• SPI interface supports daisy-chaining and CRC validation for reliable data transmission.

Applications

• Data acquisition systems
• Acoustics and dynamic strain gauge measurements
• Vibration and condition monitoring in factory automation
• Doppler ultrasound medical devices
• Power quality analyzers

Procurement Notes

Verify the specific suffix IRUKR corresponds to the tape-and-reel packaging format required for automated assembly. Confirm that the ordering information matches the manufacturer's current production status and lead time requirements. Ensure compatibility with the intended PCB footprint and thermal pad connection specifications during procurement planning.

Selection Notes

Select this component when both high-speed wideband filtering and low-latency performance are required within a single channel. Evaluate the trade-off between data throughput and power dissipation across the four available speed modes. Ensure the system design accommodates the 3mm × 3mm WQFN package dimensions and thermal management needs for the selected operating mode.

Part Context

This part belongs to the ADS127L21 family of high-precision ADCs. It shares the core architecture with variants like the ADS127L21EVM-PDK evaluation module but differs in packaging and delivery format. The IRUKR designation specifically identifies the surface-mount reel version of the standard ADS127L21 device.

Replacement Considerations

Direct substitutes include other parts within the ADS127L21 family such as the ADS127L21IRUKT. Verify pinout compatibility and register configuration similarities before swapping packages. Cross-reference thermal resistance values if changing from tray to reel packaging.

FAQ

What is the difference between the wideband and low-latency filter modes?

The wideband filter mode optimizes AC signal performance with data rates up to 512kSPS, while the low-latency filter mode prioritizes data throughput with a conversion latency of only 3µs and speeds up to 1365kSPS.

How does the device handle input buffering?

The ADS127L21 includes buffered inputs for both signals and references. These buffers reduce the load on external drivers, which helps maintain accuracy by minimizing errors caused by source impedance.

Is the SPI interface capable of daisy-chaining?

Yes, the serial interface supports daisy-chain capability. This feature allows multiple devices to be connected using fewer signal lines, which is particularly useful for reducing complexity across isolation barriers.