TIDA-01576

High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC

TIDA-01576

Design files

Overview

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

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

PDF | HTML
TIDUDP7A.PDF (1831 K)

Reference design overview and verified performance test data

TIDRUC5A.ZIP (2094 K)

Detailed schematic diagram for design layout and components

TIDRUC6A.ZIP (547 K)

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

TIDRUC7A.ZIP (1371 K)

Detailed overview of design layout for component placement

TIDRUC9A.ZIP (10839 K)

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

TIDCE73A.ZIP (3565 K)

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

TIDRUC8A.ZIP (5413 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Analog temperature sensors

LM351C high voltage analog temperature sensor, 10 mV/C

Data sheet: PDF | HTML
Analog temperature sensors

LMT700.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin

Data sheet: PDF | HTML
Charge pumps (inductorless)

REG7105560-mA, 5.5V, Buck/boost Charge Pump in ThinSOT-23

Data sheet: PDF | HTML
Digital isolators

ISO7720Robust EMC, dual-channel, 2/0, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7762Robust EMC, six-channel, 4/2, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7763Robust EMC, six-channel, 3/3, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7820Highest isolation rating, dual-channel, 2/0, reinforced digital isolator

Data sheet: PDF | HTML
Digital isolators

ISO7841Highest isolation rating, quad-channel, 3/1, reinforced digital isolator

Data sheet: PDF | HTML
ESD & surge protection ICs

TVS330033V flat-Clamp surge protection device

Data sheet: PDF | HTML
General-purpose op amps

OPA2171Dual, 36-V, 3-MHz, low-power operational amplifier

Data sheet: PDF | HTML
Instrumentation amplifiers

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

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

UCC12040500 mW, high efficiency 3 kVrms isolated DC-DC converter

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

UCC12050500-mW, high-efficiency, 5-kVRMS isolated DC/DC converter

Data sheet: PDF | HTML
LCD & OLED display power & drivers

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

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS791100-mA, low-noise, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

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

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A471-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A49150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Load switches

TPS229445.5-V, 0.1-A, 500-mΩ, load switch with current limit and active high enable

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS866812-Bit 500kSPS 8-Channel SAR ADC With Bipolar Inputs Off 5V Supply

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS867814-Bit 500kSPS 8-Channel SAR ADC With Bipolar Inputs Off 5V Supply

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS8686S16-channel 16-bit 1-MSPS dual simultaneous-sampling ADC with integrated analog front end (AFE)

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS868816-bit, 500-kSPS, 8-channel, single-supply SAR ADC with bipolar input ranges

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS8688A16-bit, 500-kSPS, 8-channel SAR ADC with bipolar inputs using 5-V supply and low-drift VREF

Data sheet: PDF | HTML
Precision ADCs (<=10MSPS)

ADS869818-Bit 500kSPS 8-Channel SAR ADC With Bipolar Inputs Off 5V Supply

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

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

Data sheet: PDF | HTML
Series voltage references

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

Data sheet: PDF | HTML
Series voltage references

REF50404.096-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet: PDF | HTML
Series voltage references

REF60414.096-V, 5-ppm/°C high-precision voltage reference with integrated buffer & enable pin

Data sheet: PDF | HTML
Signal isolators with integrated power

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

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3836Active-low, push-pull, nano-power supervisors with manual reset

Data sheet: PDF | HTML
Transformer drivers

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

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide High-Accuracy Analog Input Mod RefDes 16-bit 1-MSPS Dual Simul (Rev. A) PDF | HTML Apr. 22, 2020
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML Nov. 09, 2022
Technical article Interfacing multiple ADCs to a single processor for grid protection and control Sep. 13, 2018

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