Texas Instruments ADS127L21IRUKR

Overview

ADS127L21IRUKR from Texas Instruments is a 24-bit, wideband delta-sigma analog-to-digital converter with programmable FIR/IIR digital filters, 512kSPS wideband data rate, 3µs low-latency conversion, ±VREF/±2VREF input range, and buffered analog inputs - deployed in high-accuracy vibration monitoring and Doppler ultrasound signal chains.

For engineers reviewing the ADS127L21IRUKR datasheet, ADS127L21IRUKR pinout, ADS127L21IRUKR application, or ADS127L21IRUKR equivalent, this page delivers verified specifications, thermal and timing constraints for industrial-grade signal acquisition, functional safety design support, and validated alternatives for precision ADC migration paths.

Technical Context

The ADS127L21IRUKR integrates a low-drift modulator with dual programmable filter paths: a wideband sinc/FIR configuration (up to 512kSPS) and a low-latency mode (up to 1.365MSPS, 3µs latency). Its digital filtering architecture supports A-weighting compensation and notch filtering via 128-tap FIR and four-biquad IIR stages.

It features dual analog supplies (AVDD1/AVSS and AVDD2), isolated digital I/O (IOVDD), internal/external clock operation, SPI interface with CRC validation, daisy-chain capability, and functional safety documentation - all operating across –40°C to +125°C with full specification at 125°C ambient.

Key Specifications

Pinout & Package

The ADS127L21IRUKR is housed in a 20-pin WQFN package (RUK), 3mm × 3mm body with exposed thermal pad connected to AVSS - optimized for space-constrained PCB layouts and thermal dissipation in high-density signal conditioning modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, programmable-filter ADC applications.

Compared with ADS131M08IPBSR and AD7768-1ACPZ, the ADS127L21IRUKR uniquely combines single-channel 512kSPS wideband throughput, 3µs low-latency mode, and user-programmable FIR/IIR filters - making it optimal for applications demanding both spectral fidelity and real-time responsiveness in one device.

Availability

ADS127L21IRUKR is available at Aetrix Electronics and suitable for test and measurement DAQ systems, factory vibration monitors, medical Doppler ultrasound front-ends, and grid power quality analyzers requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ADS127L21IRUKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision data converters and industrial-grade ICs.

The ADS127L21IRUKR belongs to TI's high-performance delta-sigma ADC product line, engineered for applications demanding simultaneous ac fidelity and dc precision - including condition monitoring, medical imaging, and energy infrastructure analytics.

FAQ

What is the maximum data rate of the ADS127L21IRUKR in wideband filter mode?

The ADS127L21IRUKR achieves a maximum data rate of 512kSPS in wideband filter mode using its full FIR filter configuration. This rate is specified under recommended operating conditions with AVDD1 = 5V, IOVDD = 1.8V, and fCLK = 32.768MHz. At this speed, the device maintains 111.5dB typical dynamic range and –125dB THD, making it suitable for high-bandwidth sensor digitization without external decimation.

Does the ADS127L21IRUKR support low-latency operation, and what is its conversion latency?

Yes, the ADS127L21IRUKR supports low-latency filter mode with a guaranteed conversion latency of 3µs. This mode delivers up to 1.365MSPS throughput while preserving 24-bit resolution and functional safety documentation. The latency is deterministic and independent of data rate selection within the low-latency profile - critical for time-sensitive applications like Doppler ultrasound time-of-flight measurement.

How does the programmable FIR/IIR filtering work on the ADS127L21IRUKR?

The ADS127L21IRUKR integrates a 128-tap programmable FIR filter and a four-biquad IIR filter with 32-bit coefficient resolution. Users configure filter coefficients via SPI to implement custom responses - such as A-weighting for acoustic measurements or 50/60Hz notch filters for power-line interference rejection. Both filters operate in configurable sequences (FIR→IIR or IIR→FIR) with decimation ratios of 2 (FIR3) or 1 (IIR).

What power supply configurations does the ADS127L21IRUKR require?

The ADS127L21IRUKR requires three independent supply domains: AVDD1/AVSS (analog core, 2.85–5.5V), AVDD2 (auxiliary analog, 1.74–5.5V), and IOVDD (digital I/O, 1.65–5.5V). DGND serves as the digital ground reference. Separation of AVDD1 and AVDD2 minimizes switching noise coupling into the modulator, while IOVDD independence allows level-shifting to FPGA or microcontroller interfaces without logic-level translation.

Is the ADS127L21IRUKR qualified for operation at 125°C ambient temperature?

Yes, the ADS127L21IRUKR is fully specified and tested over –40°C to +125°C ambient temperature. Key parameters - including INL (0.4ppm FSR typ), offset drift (50nV/°C typ), and dynamic range (111.5dB at 200kSPS) - are guaranteed across this range. Thermal metrics (RθJA = 58.3°C/W) confirm reliable operation in sealed enclosures or under-hood industrial environments without derating.