Interface to a Sin/Cos Encoder with Sitara AM437x Reference Design
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Key Document


The TIDA-00178 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-00178 provides a direct connection to Sitara AM437x using SPI and QEP. For quick evaluation it features a 60-pin connector which directly fits the AM437x IDK. An example firmware for Sitara AM437x IDK is provided, which outputs the measured angle from the Sin/Cos encoder with up to 28-bit resolution through the Sitara’s USB virtual COM port.

  • EMC Compliant Industrial Interface Design for Sin/Cos Encoders with 1-Vpp 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
  • Fully Differential Analog Signal Chain for High Common Mode Noise Immunity with Dual 16-bit ADC with Drop-in Compatible 14- or 12-bit ADC Pending Desired Resolution
  • Easy to Connect to Sitara AM437x with SPI and QEP Interface. Connects directly to AM437x IDK 60-Pin Header
  • Example Firmware for Sitara AM437x with High-Resolution Angle Calculated at 32-kHz and Angle Data Send via USB virtual COM Port for Easy Performance Evaluation
  • Designed 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
REF2025  8ppm/°C Drift, Low-Power, Dual-Output Vref and Vref/2 Voltage Reference  Voltage references  Sample & Buy Not Available
SN74LVC3G17  TRIPLE SCHMITT-TRIGGER BUFFER  Buffer/driver  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
TPS5401  3.5V to 42V Input, 0.5 A Step Down Converter  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
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REF2025 Download -
SN74LVC3G17 Download Download
Download Download
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THS4531A Download
TLV3202 Download
TPS5401 Download Download
TPS717 Download Download
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TPS799 Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 6385 14 Sep 2015
Design files (6)
Title Type Size (KB) Date
ZIP 565 06 Jul 2015
ZIP 3022 06 Jul 2015
PDF 3990 06 Jul 2015
PDF 560 06 Jul 2015
PDF 38 06 Jul 2015
PDF 716 06 Jul 2015
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