High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC
TIDA-01576
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Description & Features

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Key Document

Description

This reference design accurately measures 16-channel AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range. This range covers protection and measurement requirements (including sampling requirements as per IEC 61850-9-2), which simplifies system design and improves trip time repeatability, performance, and reliability. The AC analog input module (AIM) is isolated from the host processor using a digital isolator with an integrated power converter or using a six-channel digital isolator. In its simplest configuration, a complete AC AIM can be designed using only five TI products to optimize system cost and size. The alarm feature identifies the AC AIM faults on a sample basis for faster fault detection. The ADC has an additional auxiliary channel to diagnose the output of the digital isolator supply or to compensate the measured analog inputs for temperature drift.

Features
  • Based on ADS8688A 16-bit ADC (compatible with ADS8668 or ADS8698) and supports up to 16 analog inputs  by daisy chaining  two ADCs or connecting two ADCs in dual SDO output configuration
  • AC analog input module provides spectral performance of ENOB of > 14.9 bits, SNR of > 91 DB and THD of  > -110 DB with isolated interface
  • ADC  interface is isolated from the host for improved system safety in harsh operating conditions using ISOW7841 digital isolator with integrated power converter and provides current output of > 60mA with efficiency >=45 % or ISO7763 digital isolator with external isolated power
  • Diagnostics features included  monitoring supply output and ripple, voltage supervisor, on-board temperature sensor, LEDs for power and alarm output
  • PHI Precision Host Interface processor  Board connected to TIDA-01576 and GUI  using  Breakout Board for Quick Performance Evaluation.  Phase Compensation Using GUI for Simultaneous Sampling of input samples

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Design Guide

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Design Files

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TI Devices (34)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8668  12-Bit 500kSPS 8-Channel SAR ADC With Bipolar Inputs Off 5V Supply  Analog-to-digital converters (ADCs)  Sample & Buy Not Available
ADS8678  14-Bit 500kSPS 8-Channel SAR ADC With Bipolar Inputs Off 5V Supply  Analog-to-digital converters (ADCs)  Sample & Buy Not Available
ADS8686S  16-channel 16-bit 1-MSPS dual simultaneous-sampling ADC with integrated analog front end (AFE)  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS8688  16-Bit 500kSPS 8-Channel Single-Supply SAR ADC With Bipolar Input Ranges  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS8688A  16-Bit 500kSPS 8-Ch SAR ADC With Bipolar Inputs Using 5V Supply and Low-Drift Vref  Analog-to-digital converters (ADCs)  Sample & Buy Not Available
ADS8698  18-Bit 500kSPS 8-Channel SAR ADC With Bipolar Inputs Off 5V Supply  Analog-to-digital converters (ADCs)  Sample & Buy Not Available
CSD17571Q2  30V, N ch NexFET MOSFET™, single SON2x2, 29mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
INA188  36-V, Zero-Drift, Rail-to-Rail-Out Instrumentation Amplifier  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
ISO7720  Robust EMC, dual-channel, 2/0, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7762  Robust EMC, six-channel, 4/2, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7763  Robust EMC, six-channel, 3/3, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7820  Highest isolation rating, dual-channel, 2/0, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7841  Highest isolation rating, quad-channel, 3/1, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISOW7841  High-efficiency, low-emissions, quad-channel, 3/1, reinforced digital isolator with integrated power  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM35  ±0.5°C 4V-30V, Temperature sensor with analog output  Temperature sensors  Sample & Buy Not Available
LMT70  ±0.1°C ultra-small, high-precision, low-power CMOS analog temperature sensor  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
OPA2171  2-Channel, 3-MHz, 36V, low power, RRO, general purpose op amp in MicroPackages  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA2188  0.03µV/°C, 6µV Vos, Low Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5025  2.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
REF5040  4.096-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
REF6041  4.096-V, 5-ppm/°C high-precision voltage reference with integrated buffer & enable pin  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
REG71055  60-mA, 5.5V, Buck/boost Charge Pump in ThinSOT-23  DC/DC switching regulators  Sample & Buy View Design Kits & Evaluation Modules
SN6505B  Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
TPS22944  5.5-V, 0.1-A, 500-mΩ, load switch with current limit and active high enable  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS3836  Active-low, push-pull, nano-power supervisors with manual reset  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS65131  Split-Rail Converter with Dual, Positive and Negative Outputs (750mA typ)  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection & enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS791  100-mA, low-noise, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A39  150-mA, 33-V, low-noise, high-PSRR, dual-channel positive & negative low-dropout voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TVS3300  33-V flat-clamp surge protection device  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules
UCC12040  500 mW, high efficiency 3 kVrms isolated DC-DC converter  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
UCC12050  500 mW, high-efficiency, 5 kVRMS isolated DC/DC converter  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8668 Download
ADS8678 Download
ADS8686S Download
ADS8688 Download
ADS8688A Download
ADS8698 Download Download
CSD17571Q2 WSON (DQK)| 6 Download Download
INA188 Download Download
ISO7720 Download Download
Download
Download Download
ISO7762 Download Download
Download Download
ISO7763 Download Download
Download Download
ISO7820 Download Download
Download
ISO7841 Download Download
Download Download
ISOW7841 Download Download
LM35 Download Download
Download Download
TO-220 (NEB)| 3 Download Download
Download Download
LMT70 Download -
OPA2171 Download Download
Download Download
Download Download
OPA2188 Download Download
Download Download
REF5025 Download Download
Download Download
REF5040 Download Download
Download Download
REF6041 Download Download
REG71055 Download Download
SN6505B Download Download
TPS22944 Download Download
TPS3836 Download Download
TPS65131 Download Download
TPS709 Download
Download
TPS791 Download
Download
TPS7A39 Download Download
TPS7A47 Download Download
TPS7A49 Download Download
Download Download
TVS3300 Download
UCC12040 Download
UCC12050 Download Download

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Technical documentation

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Datasheet (1)
Title Type Size (KB) Date
PDF 2876 21 Apr 2015
User guides (1)
Title Type Size (KB) Date
PDF 1768 22 Apr 2020
Design files (6)
Title Type Size (KB) Date
ZIP 2094 22 Apr 2020
ZIP 5413 22 Apr 2020
ZIP 3565 22 Apr 2020
ZIP 10839 22 Apr 2020
ZIP 547 22 Apr 2020
ZIP 1371 22 Apr 2020

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