TIDA-00835

High Accuracy ±0.5% Current and Isolated Voltage Measurement Ref Design Using 24-Bit Delta-Sigma ADC

TIDA-00835

Design files

Overview

The TIDA-00835 reference design allows for accurate voltage and current measurement using a bipolar input configuration by incorporating a four- channel, 24-bit simultaneously-sampling differential input Delta-Sigma ADC over wide dynamic range. The ADC is configured to measure ±2.5 V bipolar input.  The inputs are scaled to ADC measurement range of ±2.5V using a fixed gain amplifier. This AFE chains two ADCs together using a common external clock to expand the number of input channels to eight while simultaneously sampling all of the input channels. By having more measurement channels per module, overall system cost is reduced.

Features
  • Precision data acquisition over wide input range using 4-channel, simultaneous sampling, 24-Bit ∑-∆ ADCs
  • Channel expansion by chaining multiple devices and simultaneous sampling by synchronizing with a buffered common clock
  • Current measurement – performance verified using current transformer or Rogowski coil with hardware integrator
  • Voltage measurement – performance verified using potential divider (PD) without and with an isolation amplifier (basic or reinforced isolation)

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.

TIDUBY8B.PDF (3164 K)

Reference design overview and verified performance test data

TIDRMT4A.PDF (904 K)

Detailed schematic diagram for design layout and components

TIDRMT5A.PDF (112 K)

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

TIDRMT6A.ZIP (926 K)

Detailed overview of design layout for component placement

TIDRMT8A.ZIP (3194 K)

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

TIDCCF7A.ZIP (962 K)

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

TIDRMT7A.PDF (3747 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs (<=10MSPS)

ADS131A0224-bit 128-kSPS 2-channel simultaneous-sampling delta-sigma ADC

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Precision ADCs (<=10MSPS)

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

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Precision ADCs (<=10MSPS)

ADS131E0824-bit 64-kSPS 8-channel simultaneous-sampling delta-sigma ADC for power monitoring and protection

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Precision ADCs (<=10MSPS)

ADS131E08S24-bit 64-kSPS 8-ch simultaneous delta-sigma ADC with fast start-up for monitoring and protection

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Charge pumps (inductorless)

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

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Charge pumps (inductorless)

TPS6040360mA Charge Pump Voltage Inverter with Fixed 250kHz Operation

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Clock buffers

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

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ESD & surge protection ICs

TVS05005V flat-clamp surge protection device

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General-purpose op amps

OPA4171Quad, 36-V, 3-MHz, low-power operational amplifier

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General-purpose op amps

TLV9061Single, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications

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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

AMC13112-V input, reinforced isolated amplifier with high CMTI for voltage sensing

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Isolated amplifiers

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

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Linear & low-dropout (LDO) regulators

TLV704150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator

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Linear & low-dropout (LDO) regulators

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

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Linear & low-dropout (LDO) regulators

TPS723200-mA, negative, adjustable low-dropout voltage regulator with enable

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Precision op amps (Vos<1mV)

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

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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

REF34404.1-V, low-drift, low-power, small-footprint series voltage reference

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Shunt voltage references

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

Data sheet document-pdfAcrobat PDF
Transformer drivers

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

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Technical documentation

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Type Title Date
* Design guide High Accuracy ±0.5% Curr Iso Volt Measurement Ref Design Using 24-Bit DS ADC (Rev. B) Sep. 26, 2018
Technical article Covering wide analog input measurement for grid protection and control using 24-bit delta-sigma ADCs Dec. 04, 2018
Technical article Tripping Point: Isolation amplifier-based alternating current voltage measurement in protection relays Oct. 07, 2016

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