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TIDA-00176

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

Design files

TIDA-00176

Design files

Overview

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.

Features
  • 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.

download Design guide — TIDA-00176
TIDUA05A.PDF (11507 K)

Reference design overview and verified performance test data

download Schematic — TIDA-00176
TIDRF54.PDF (758 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIDA-00176
TIDRF55.PDF (48 K)

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

download Assembly drawing — TIDA-00176
TIDRF58.PDF (388 K)

Detailed overview of design layout for component placement

download CAD/CAE symbol — TIDA-00176
TIDRF57.ZIP (3771 K)

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

download Gerber file — TIDA-00176
TIDCAF2.ZIP (1051 K)

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

download PCB layout — TIDA-00176
TIDRF56.PDF (3063 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

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Comparators

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Fully differential amplifiers

THS4531A — Ultra Low Power, RRO, Fully-Differential Amplifier

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High-speed op amps (GBW ≥ 50 MHz)

OPA2365 — 2.2V, 50MHz, Low-Noise Single-Supply Rail-to-Rail Operational Amplifiers

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Linear & low-dropout (LDO) regulators

TPS717 — 150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

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

TPS799 — 200-mA, low-IQ, low-dropout voltage regulator with low-noise & enable

Data sheet: PDF | HTML
Series voltage references

REF2033 — 3.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

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Start development

Software

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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