TIDA-00834

High Accuracy Analog Front End Using 16-Bit SAR ADC with ±10V Measurement Range Reference Design

TIDA-00834

Design files

Overview

The TIDA-00834 reference design accurately measures voltage and current inputs using simultaneously sampled, 16-bit, ±10 V, bipolar input SAR ADC critical to identify power systems malfunction and power quality related failures accurately and quickly. This results in reduced power systems downtime. The AFE includes signal conditioning based on precision instrumentation or precision amplifier for current measurement upto 125A and opamp based signal conditioning circuit for voltage measurement upto 300V. The gain amplifier for voltage and current inputs are used to scale the sensor output to the ADC range. Coherent sampling of the analog input signals is implemented using comparator and FPGA. The power supply for data acquisition front end is generated using a +5V input.

Features
  • Based on bipolar input 16-bit 8-channel simultaneous sampling SAR ADC simplifying system design
  • On-board potential divider with reinforced isolation amplifier and fixed gain precision amplifier for measurement up to 300V
  • On-board DC/DC converter and LDOs to generate ±12V, ±15V, ±5V, +5V, +3.3V and isolated +5V from single +5V input for easy adaptation to current designs
  • Measurement accuracy within ±0.25% for  ≥ 1000:1 dynamic range
  • Option to configure sampling rate and number of cycles for data capture using HMI enhancing system performances

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCO9B.PDF (873 K)

Reference design overview and verified performance test data

TIDRPX4A.ZIP (1530 K)

Detailed schematic diagram for design layout and components

TIDRPX5A.ZIP (295 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRPX6.ZIP (766 K)

Detailed overview of design layout for component placement

TIDRPX8A.ZIP (9651 K)

Files used for 3D models or 2D drawings of IC components

TIDCD70.ZIP (4136 K)

Design file that contains information on physical board layer of design PCB

TIDRPX7.ZIP (4773 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Charge pumps (inductorless)

LM27762Low-Noise Positive- and Negative-Output Charge Pump With Integrated LDO

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Digital isolators

ISO7741Robust EMC, quad-channel, 3/1, reinforced digital isolator

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ESD & surge protection ICs

TVS140014V flat-clamp surge protection device

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ESD & surge protection ICs

TVS140114-V bidirectional flat-clamp surge protection device

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Instrumentation amplifiers

INA18836-V, Zero-Drift, Rail-to-Rail-Out Instrumentation Amplifier

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Isolated DC/DC converters & modules

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

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Isolated DC/DC converters & modules

LM5160LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter

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Isolated amplifiers

AMC1200±250-mV-input basic isolated amplifier for current sensing

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Isolated amplifiers

AMC1300±250-mV input, reinforced isolated amplifier with high CMTI for current sensing

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Isolated amplifiers

AMC1301±250 mV-Input Precision Reinforced Isolated Amplifier for Current Sensing

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Isolated amplifiers

ISO224Reinforced isolated amplifier for voltage sensing with ±12-V input

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LCD & OLED display power & drivers

TPS65131Split-Rail Converter with Dual, Positive and Negative Outputs (750mA typ)

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Linear & low-dropout (LDO) regulators

TLV1117800-mA, 15-V, linear voltage regulator

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Linear & low-dropout (LDO) regulators

TPS7A30200-mA, low-noise, high-PSRR, negative, adjustable low-dropout voltage regulator with enable

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Linear & low-dropout (LDO) regulators

TPS7A39150-mA, 33-V, low-noise, high-PSRR, dual-channel positive & negative low-dropout voltage regulator

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Precision ADCs (<=10MSPS)

ADS8578S14-Bit High-Speed 8-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision ADCs (<=10MSPS)

ADS8584S16-Bit High-Speed 4-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision ADCs (<=10MSPS)

ADS8586S16-Bit High-Speed 6-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision ADCs (<=10MSPS)

ADS8588H16-Bit 500kSPS 8-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision ADCs (<=10MSPS)

ADS8588S16-Bit High-Speed 8-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision ADCs (<=10MSPS)

ADS8598H18-Bit 500kSPS 8-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision ADCs (<=10MSPS)

ADS8598S18-Bit 200kSPS 8-Channel Simultaneous-Sampling ADC With Bipolar Inputs on a Single Supply

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Precision op amps (Vos<1mV)

OPA21880.03µV/°C, 6µV Vos, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

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Series voltage references

REF34252.5-V, low-drift, low-power, small-footprint series voltage reference

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Series voltage references

REF50252.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

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Signal isolators with integrated power

ISOW7841Quad-channel, 3/1, reinforced digital isolator with integrated power

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Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

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Transformer drivers

SN6505BLow-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies

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Start development

Hardware

Evaluation board

ADS8588SEVM-PDK – ADS8588S 16-Bit High-Speed 8-Ch Simultaneous-Sampling ADC EVM Performance Demonstration Kit (PDK)

The ADS8588S evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the performance of the ADS8588S successive approximation register analog-to-digital converter (SAR ADC). The ADS8588SEVM-PDK includes the ADS8588S EVM board, the PHI controller board, and (...)
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Technical documentation

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Type Title Date
* Design guide High-accuracy analog front-end reference design using 14-,16-,18-bit SAR ADC (Rev. B) Feb. 20, 2019
Technical article Interfacing multiple ADCs to a single processor for grid protection and control Sep. 13, 2018

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