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[FAQ] TIDA-01434: How does ADS124S08 enable high channel density in PLC analog input modules?

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Part Number: TIDA-01434

How does ADS124S08 (low power precision delta-sigma ADC) enable high channel density in PLC analog input modules as shown in reference design TIDA-01434?

  • TIDA-01434 is an isolated, 3.65-mm thin TI Reference Design that enables highly-integrated, bipolar input and high-performance solutions with a 24-bit delta-sigma analog-to-digital converter (ADC). Modern analog input modules need high performance in different aspects such as higher channel density at the same room size, which requires lower power consumption, and a wider operating temperature range at the same time.

    The ADS124S08 is a precision, 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) that offers low power consumption and many integrated features to reduce system cost and component count in applications measuring small-signal sensors. These ADCs feature configurable digital filters that offer low-latency conversion results and 50 Hz or 60 Hz rejection for noisy industrial environments. A low-noise, programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals for resistive bridge or thermocouple applications. Additionally, these devices integrate a low-drift, 2.5-V reference that reduces printed circuit board (PCB) area. Finally, two programmable excitation current sources (IDACs) allow for easy and accurate RTD biasing. An input multiplexer supports 12 inputs for the ADS124S08 that can be connected to the ADC in any combination for design flexibility.

    TIDA-01434 utilizes ADS124S08s high integration factor including the whole AFE (Analog Front End). This combined with its small package minimizes space requirements, which are sought after in analog input modules to achieve high channel density.

    For additional information about this topic, please refer to section 2.3 "System Design Theory" of the User Guide for TIDA-01434.

    You can also download the design files (BOM, Schematic, Gerber) for this reference design from the TIDA-01434 folder.

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