Interface to Sin/Cos Encoders with High-Resolution Position Interpolation Reference Design


Design files


The TIDA-00176 reference design is an EMC compliant industrial interface to Sin/Cos position encoders. Applications include industrial drives, which require accurate speed and position control.
The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available, allowing for optimization of performance and cost. TIDA-00176 is also provides a simple to connection to external processors using SPI and QEP interfaces and allows for the use of optional, embedded ADCs. For quick evaluation an example firmware for Piccolo F28069M MCU LaunchPad is provided, which outputs the measured angle from the Sin/Cos encoder with up to 28-bit resolution through the MCU’s USB virtual COM port.

  • EMC Compliant Industrial Interface Design for Sin/Cos Encoders with 1Vpp Differential Output at 2.5-V Offset, Input Frequencies up to 500-kHz
  • High-Resolution Interpolated Position, up to 28-bits Resolution, Cable Length Tested up to 70m
  • Dual Analog Signal Chain for Simultaneous Use of 16-bit Dual SAR ADC and MCU Embedded ADCs Allows for Evaluation of Both Paths and/or Optimization of One Path for Increased Noise Immunity with Reduced Bandwidth
  • Easy to Connect to MCU with SPI and QEP Interface and Option for Cost Optimization pending Resolution Requirements, Thanks to Drop-in Compatible 14- or 12-bit  ADC
  • Example Firmware for C2000 MCU with High-Resolution Angle Calculated at 16-kHz and Angle Data Send via USB virtual COM Port for Easy Performance Evaluation
  • Tested for IEC61000-4-2,4-4 and 4-5 (ESD, EFT and Surge EMC Immunity Requirements)
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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.

TIDUA05A.PDF (11507 K)

Reference design overview and verified performance test data

TIDRF54.PDF (758 K)

Detailed schematic diagram for design layout and components

TIDRF55.PDF (48 K)

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

TIDRF58.PDF (388 K)

Detailed overview of design layout for component placement

TIDRF57.ZIP (3771 K)

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

TIDCAF2.ZIP (1051 K)

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

TIDRF56.PDF (3063 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
* Design guide Interface to Sin/Cos Encoders Design Guide (Rev. A) Jul. 09, 2015
Technical article Designing an EMC-compliant interface to motor position encoders – Part 5 PDF | HTML Nov. 10, 2015

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