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


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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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8354  Dual 700kSPS 16-Bit Simultaneous-Sampling SAR Analog-to-Digital Converter (ADC)  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
OPA2365  2.2V, 50MHz, Low-Noise Single-Supply Rail-to-Rail Operational Amplifiers  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF2033  Low-Drift, Low-Power, Dual-Output Vref and Vref/2 Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
THS4531A  Ultra Low Power, RRO, Fully-Differential Amplifier  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TLV3202  Dual, 40ns, microPower, Rail-to-Rail input Comparator with Push-pull outputs  Amplifiers  Sample & Buy Not Available
TPS54040A  3.5V to 42V Input, 0.5A Step-Down Converter with Eco-Mode  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
TPS717  150mA, High PSRR, Low Quiescent Current, Low Noise LDO  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS799  200mA, Low Quiescent Current, Ultra-Low Noise, High PSRR Low Dropout Linear Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8354 Download Download
Download Download
OPA2365 Download Download
REF2033 Download -
THS4531A Download
TLV3202 Download
TPS54040A Download
TPS717 Download Download
Download Download
Download Download
TPS799 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 11507 09 Jul 2015
Design files (6)
Title Type Size (KB) Date
PDF 388 10 Jun 2015
ZIP 1051 10 Jun 2015
ZIP 3771 10 Jun 2015
PDF 3063 10 Jun 2015
PDF 48 10 Jun 2015
PDF 758 10 Jun 2015
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