ADS127L11IRUKR

Overview

The ADS127L11IRUKR is a 24-bit delta-sigma analog-to-digital converter (ADC) from Texas Instruments, housed in a 20-pin WQFN package measuring 3.00 mm × 3.00 mm. It supports data rates up to 400 kSPS with the wideband filter and up to 1067 kSPS with the low-latency filter. The device operates on an analog supply of 4.5 V to 5.5 V and a digital I/O supply of 1.65 V to 5.5 V. Key electrical specifications include a dynamic range of 111.5 dB at 200 kSPS, total harmonic distortion of –120 dB, and integral nonlinearity of 0.9 ppm of full scale. Power consumption is 18.6 mW in high-speed mode and 3.3 mW in low-speed mode.

Feature Summary

• Configurable digital filters allow selection between wideband operation for optimal AC performance and low-latency operation for maximizing DC signal throughput.
• Integrated input and reference precharge buffers reduce signal loading effects while maintaining excellent DC precision and low in-band noise.
• Serial peripheral interface includes daisy-chain capability to minimize SPI I/O requirements across isolation barriers.
• Cyclic-redundancy check validation ensures operational reliability by verifying input/output data and register settings.

Applications

• Data acquisition systems
• Shock and vibration instruments
• Acoustics and dynamic strain gauges
• Condition monitoring in factory automation
• Electroencephalogram (EEG) medical devices

Procurement Notes

Verify the specific suffix 'RUK' corresponds to the 20-pin WQFN package configuration when sourcing components. Confirm that the analog supply voltage meets the minimum requirement of 4.5 V for high-speed mode operation. Ensure the digital I/O supply voltage aligns with the controller's logic levels within the 1.65 V to 5.5 V range. Check for functional safety documentation availability if the application requires compliance with safety standards.

Selection Notes

Select this component when high resolution and low power are required simultaneously. The power-scalable architecture allows optimization between data rate, resolution, and power consumption. Use the wideband filter for applications prioritizing AC accuracy and the low-latency filter for higher data throughput needs. Ensure the external clock frequency falls within the specified limits for the chosen speed mode.

Part Context

The ADS127L11 belongs to Texas Instruments' family of high-performance delta-sigma ADCs designed for precision measurement applications. The IRUKR variant specifically denotes the industrial temperature range version packaged in a compact WQFN form factor. This series is engineered to provide excellent combinations of AC performance and DC precision suitable for demanding industrial and medical environments.

Replacement Considerations

Consult the datasheet orderable addendum for alternative package options such as the TSSOP variant. Verify pin compatibility and thermal characteristics when substituting with other members of the ADS127L11 family or similar TI ADC products.

FAQ

What is the maximum data rate supported by the ADS127L11?

The device supports data rates up to 400 kSPS using the wideband filter and up to 1067 kSPS using the low-latency filter.

How does the device handle signal loading?

The ADS127L11 integrates input and reference precharge buffers to significantly reduce signal loading effects on the source circuitry.

Is the serial interface capable of connecting multiple devices?

Yes, the serial interface features daisy-chain capability, which helps reduce the number of SPI I/O lines required, particularly across isolation barriers.