Analog Input, Output and Relay Drive Output Module for Smart Grid IEDs Reference Design


Design files


This reference design showcases a flexible Analog IO solution for Smart Grid devices like Protection Relays and RTUs that also need to communicate with other devices on the grid that use the analog IO such as voltage (5V to 10V DC) or current (4-20mA). This solution enables both types of IO as well as a power digital relay drive. SPI and I2C communication interfaces are available on this module for communication to the processor.

  • Analog I/O handled includes:
    • Current Input 0-20mA / 0-24mA / 4-20mA DC
    • Voltage Input 0-5V DC / 0-10V DC
  • Excellent accuracy < ±0.2 % of incoming signal
  • High Sampling rate (up to 500kSPS)
  • Simplifies connectivity to MCU with SPI interface
  • Analog Output handling includes:
    • Flexible solution – configurable
    • Current/Voltage outputs
  • DAC Daisy Chaining minimizes connectivity to MCU
  • Digital Output handling includes:
    • 4x better power efficiency with respect to ULN series
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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.

TIDU577.PDF (7316 K)

Reference design overview and verified performance test data


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

TIDRCB4.ZIP (1530 K)

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

TIDC833.ZIP (1566 K)

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

TIDRCB3.PDF (2563 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Precision DACs (≤10 MSPS)

DAC876016-Bit Single-Channel Programmable Current/Voltage Output DAC for 4-20mA current loop applications

Data sheet: PDF | HTML
I2C general-purpose I/Os (GPIOs)

TCA6408A8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers

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

TPS7A16100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet: PDF | HTML
Low-side switches

TPL7407L40-V, 7-ch NMOS array low-side driver

Data sheet: PDF | HTML
Precision ADCs

ADS868416-Bit, 500-kSPS, 4-Ch SAR ADC w/ programmable (±10/±5/±2.5V) input ranges on +5V supply

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

OPA188Precision, Low-Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Analog Input, Output, and Relay Drive Output Module for Smart Grid IEDs Oct. 07, 2014
User guide TIDA-00310 Code Examples Nov. 26, 2014

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