ADS127L18IRSHR

Overview

The Texas Instruments ADS127L18IRSHR is a high-performance, eight-channel simultaneous-sampling analog-to-digital converter (ADC) based on the delta-sigma architecture. It features a 24-bit resolution and supports data rates up to 512 kSPS in wideband filter mode and 1365 kSPS in low-latency filter mode. The device operates with an analog supply voltage range of 2.85 V to 5.5 V and a digital supply voltage of 1.65 V to 1.95 V. It offers a typical signal-to-noise ratio (SNR) of 110 dB and includes preamplified buffered inputs. Packaged in a 7 mm x 7 mm VQFN-56 form factor, it functions within a temperature range of -40°C to 125°C.

Feature Summary

• Eight-channel simultaneous sampling with 24-bit resolution
• Data rates up to 512 kSPS (wideband) or 1365 kSPS (low latency)
• Power-scalable speed modes ranging from 24 mW at 50 kSPS to 165 mW at 512 kSPS
• High dynamic performance: 112 dB dynamic range and -118 dB THD at 200 kSPS

Applications

• Test and measurement equipment including data acquisition systems
• Industrial automation and control condition monitoring
• Aerospace and defense sonar systems
• Medical devices such as electroencephalography (EEG)
• Grid infrastructure power quality analyzers

Procurement Notes

Verify the specific suffix IRSHR corresponds to the VQFN-56 package and industrial temperature grade (-40°C to 125°C). Confirm that the analog supply voltage requirements align with system designs operating between 2.85 V and 5.5 V. Ensure digital interface compatibility with the specified 1.65 V to 1.95 V logic level for SPI communication and data output.

Selection Notes

Select this component when multi-channel simultaneous sampling is required for high-fidelity signal capture. Choose the wideband filter mode for applications prioritizing frequency response over latency, or the low-latency mode for real-time control loops. Evaluate power consumption against the selected speed mode, noting that lower speeds significantly reduce power draw. Ensure input signals are compatible with the differential/pseudo-differential/single-ended input types supported by the internal buffers.

Part Context

The ADS127L18 is part of the ADS127L1x family, which shares architectural similarities with the single-channel ADS127L11. It utilizes the same 7 mm x 7 mm VQFN footprint, facilitating direct pin-to-pin expansion or board layout reuse for designs requiring increased channel counts. This consistency simplifies scaling from single-channel to eight-channel architectures without redesigning the mechanical enclosure or primary PCB layer stack.

Replacement Considerations

For single-channel replacements, consider the ADS127L11. For other channel counts within the same family, evaluate the ADS127L14 (4 channels) or ADS127L16 (16 channels), ensuring interface and pinout compatibility if physical replacement is necessary.