8-ch Isolated High Voltage Analog Input Module with ISOW7841 Reference Design


Design files


The TIDA-01333 isolated high voltage analog input module reference design has eight channels supporting both, voltage and current measurement. In addition, 4 channels support common-mode voltages up to ±160V. Isolation of +5V line and the Serial Peripheral Interface  (SPI) communication is done in a single chip using the ISOW7841. The design uses ADS8681 which is a 16-bit analog to digital converter (ADC)  that can handle input voltages up to ±12.288V. This makes unnecessary any preprocessing of standard input voltages in the industrial space.

  • Isolated 5V supply + isolated SPI in one chip
  • Switching between voltage and current measurement for every channel
  • 4 channels with common-mode voltage of up to ±160V
  • 100MOhm input impedance
  • BeagleBone compatible
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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.

TIDUCU4.PDF (1406 K)

Reference design overview and verified performance test data

TIDRQD4.PDF (1459 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

TIDRQD8.ZIP (2244 K)

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


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

TIDRQD7.PDF (3833 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Data sheet: PDF | HTML
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Analog switches & muxes

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Difference amplifiers

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Digital isolators

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Fixed-direction voltage translators

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OR gates

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Data sheet: PDF
Precision ADCs

ADS868116-Bit, 1-MSPS, 1-Ch SAR ADC with programmable (±12/±10/±6/±5/±2.5V) input ranges on +5V supply

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

OPA192High-Voltage, Rail-to-Rail Input/Output, 5µV, 0.2µV/˚C, Precision Operational Amplifier

Data sheet: PDF | HTML
Shift registers

SN74AHC5948-Bit Shift Registers With Output Registers

Data sheet: PDF | HTML
Signal isolators with integrated power

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

Data sheet: PDF | HTML
XOR (exclusive OR) gates

SN74LVC2G862-ch, 2-input, 1.65-V to 5.5-V XOR (exclusive OR) gates

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Eight-Channel, Isolated, High-Voltage Analog Input Module With ISOW7841 Design Feb. 24, 2017
White paper Cities grow smarter through innovative semiconductor technologies Jul. 07, 2017

Related design resources

Reference designs

TIDA-00764 8-ch Isolated High Voltage Analog Input Module Reference Design

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