Reference Design to Measure AC Voltage & Current in Protection Relays w/Delta-Sigma Chip Diagnostics


Design files


The TIDA-00810 reference design accurately measures analog inputs performance and includes chip diagnostics to help identify power  systems failures early by using a highly accuracy AC voltage and current measurement analog front end (AFE) and a four-channel, 24-bit simultaneously-sampling differential input Delta-Sigma ADC for measurement over wide dynamic range. The ADC is configured to measure 0-5 V unipolar. The inputs are scaled to ADC measurement range using a fixed gain amplifier with 2.5 V DC output level shift. The AFE can be used to measure output of a current transformer, potential divider with analog isolation and Rogowski active integrator. The AFE uses 10-Bit low resolution successive approximation register (SAR) ADC in parallel with a 24 bit ∑-∆ ADC for ADS131A04 diagnostics.

  • Data acquisition and diagnostics coverage provided using 24-bit ∑-∆ ADC and 10/12-bit SAR ADC
  • Output from the ∑-∆ ADC is validated by comparing it with SAR ADC – peak/RMS value is used for validation
  • ∑-∆ ADC reference output or external reference is monitored using a comparator
  • Current measurement accuracy is verified using current transformer and Rogowski coil with hardware integrator
  • Voltage measurement accuracy is verified using a potential divider (PD) without and with an isolation amplifier
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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.


Reference design overview and verified performance test data

TIDRMS9.PDF (2357 K)

Detailed schematic diagram for design layout and components


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

TIDRMT1.ZIP (1403 K)

Detailed overview of design layout for component placement

TIDRMT3.ZIP (2252 K)

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

TIDCCF5.ZIP (1195 K)

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

TIDRMT2.PDF (6817 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Precision ADCs

ADC104S02110-Bit, 200-kSPS, 4-Ch SAR ADC with single-ended inputs and serial interface

Data sheet: PDF
Precision ADCs

ADS131A0424-bit 128-kSPS 4-channel simultaneous-sampling delta-sigma ADC

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS6040360mA Charge Pump Voltage Inverter with Fixed 250kHz Operation

Data sheet: PDF | HTML
Clock buffers

CDCLVC1102Low jitter, 1:2 LVCMOS fan-out clock buffer

Data sheet: PDF | HTML

LMV331Single General Purpose Low-Voltage Comparator

Data sheet: PDF | HTML
Isolated amplifiers

AMC1200±250-mV input, precision current sensing basic isolated amplifier

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

TLV704150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

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

TPS717150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

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

OPA41800.1 uV/C Drift, Quad, Low Noise, Rail-to-Rail, 36V Zero Drift Op Amp

Data sheet: PDF | HTML
Shunt voltage references

LM4040-N100-ppm/°C precision micropower shunt voltage reference

Data sheet: PDF
Transformer drivers

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

Data sheet: PDF | HTML

Start development



TIDCCF6 TIDA-00810 Firmware

Technical documentation

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Type Title Date
* Design guide Ref Design to Measure AC Volt and Curr in Protection Relay w/ DS Chip Diagnostic (Rev. A) Nov. 15, 2016
Technical article Exploring high-voltage transmission – part 1, line-commutated converters PDF | HTML Mar. 07, 2017

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