ADS127L18IRSHT

Overview

The ADS127L18IRSHT is an eight-channel, 24-bit simultaneous-sampling analog-to-digital converter (ADC) from Texas Instruments. It utilizes a sigma-delta architecture and supports data rates up to 512 kSPS in broadband 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. Key performance metrics include a typical signal-to-noise ratio (SNR) of 110 dB at 200 kSPS and a dynamic range of 112 dB. It features programmable preamplifiers and is housed in a 7 mm x 7 mm VQFN-56 package suitable for surface-mount installation.

Feature Summary

• Eight-channel simultaneous sampling with 24-bit resolution
• High-speed operation up to 512 kSPS (broadband) or 1365 kSPS (low-latency)
• Low power consumption ranging from 24 mW to 165 mW based on speed mode
• Programmable input preamplifiers with gain settings via pins or SPI

Applications

• Data acquisition (DAQ) systems
• Shock and vibration instrumentation
• Acoustic and dynamic strain gauge measurements
• Condition monitoring in factory automation
• Sonar and aerospace/defense applications

Procurement Notes

Verify the suffix 'IRSHT' confirms the specific tape-and-reel packaging variant. Confirm that the IOVDD requirement aligns with the 1.65 V to 1.95 V specification provided in the datasheet. Ensure the design accommodates the 7 mm x 7 mm VQFN-56 footprint and thermal requirements for the selected operating speed mode.

Selection Notes

Select this component when multi-channel simultaneous sampling is required. Choose between broadband and low-latency filter modes based on application latency constraints. Verify that the input signal range fits within the programmable amplifier capabilities. Ensure the system clock can support the desired maximum sample rate of 512 kSPS or 1365 kSPS.

Part Context

The ADS127L18 is part of the ADS127L1x family, sharing the same 7 mm x 7 mm VQFN package as the single-channel ADS127L11. This pin-compatible form factor allows for direct expansion from single-channel designs to eight-channel systems without altering the PCB layout significantly.

Replacement Considerations

The ADS127L14 offers a similar architecture but with four channels and an SPI interface instead of parallel. The ADS127L21 provides higher channel counts but may require different reference voltage considerations.