Reference Design for Interfacing Current Output Hall Sensors and CTs with Differential ADC/MCU


Design files


This reference design provides interfacing current output Hall sensors and current transformers to differential ADC (standalone and integrated into MCU). The differential signal conditioning circuit is designed to measure motor current with an accuracy of ±0.5% across operating temperature range from -25°C to 75°C. The output common-mode voltage of the differential amplifier can be selected to either 1.25 V or 2.5 V.

  • On-board current-output Hall sensor to measure nominal current up to 25-A RMS
  • Current measurement accuracy of 0.5%
  • Common reference solution for interfacing both CT and current output hall sensor with pseudo-differential ADC/MCU
  • Selectable output common-mode voltage for the differential amplifier
  • Provision to evaluate with Delfino F2837x control card
  • Provision to evaluate with external ADC (ADS8354) for interfacing with motor controller

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.

TIDUA57A.PDF (10586 K)

Reference design overview and verified performance test data

TIDRFH0.PDF (1248 K)

Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRFH4.ZIP (3970 K)

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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

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TLV1702Dual high voltage, low power comparator

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Fully differential amplifiers

THS4531AUltra Low Power, RRO, Fully-Differential Amplifier

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General-purpose op amps

OPA322Single, 5.5-V, 20-MHz, 65-mA output current, low noise (8.5-nV/√Hz) operational amplifier

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

LP2992250-mA, 16-V, low-dropout voltage regulator with enable

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

TPS7A30200-mA, low-noise, high-PSRR, negative, adjustable 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
Series voltage references

REF20258-ppm/°C drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Interfacing Current Output Hall Sensors (ADC/MCU) Design Guide (Rev. A) Aug. 25, 2015

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