High-Resolution, Low-Drift, Precision Weigh-Scale Reference Design with AC Bridge Excitation

(ACTIVE) TIPD188

Description & Features

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Key Document

Description

This precision weigh-scale reference design achieves greater than 50,000 noise-free counts of resolution. Offset and offset drift errors are nearly eliminated by ac bridge excitation. This design takes advantage of the high-resolution ADS1262 delta-sigma ADC.

Features
  • >50,000 noise-free count weigh-scale solution
  • Operating temperature range: -40 ᵒC to +125 ᵒC
  • Less than 1 μV total error across temperature range
  • ADC Supply and Bridge Excitation Voltage: 5V
  • Bridge Output: 0 V to 10 mV
  • Firmware provides ADS1262 example code
  • This robust circuit reference design includes theory, complete error analysis, component selection, simulation, PCB design, example code, and measured data that correlates with the theory and simulation.

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  



Schematic/Block Diagram

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Test Data

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Bill of Materials (BOM)

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1262  32-Bit 38kSPS 10-Ch Delta-Sigma ADC With PGA and Voltage Reference for Factory Automation  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ADS1263  32-Bit 38kSPS 10-Ch Delta-Sigma ADC With PGA, Voltage Reference, and Aux ADC for Factory Automation  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430F5529  25 MHz MCU with Integrated USB Phy, 128KB Flash, 8KB RAM, 12Bit/14 Channel ADC, 32BIT HW Multiplier  MSP430 ultra-low-power MCUs  Sample & Buy View Design Kits & Evaluation Modules
TS5A21366  0.75-Ohm Dual SPST Analog Switch with 1.8-V compatible input logic  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1262 Download Download
ADS1263 Download Download
MSP430F5529 Download Download
TS5A21366 Download Download
Download Download

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Step 2: Download the Symbol and Footprint from the CAD.bxl file table.


Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1675 17 Jul 2015 310
Design files (2)
Title Abstract Type Size (KB) Date Views
PDF 193 20 Jul 2015 203
PDF 176 20 Jul 2015 263
Related Tools & Software

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
MSP430F5529 USB LaunchPad Evaluation Kit  MSP-EXP430F5529LP  Evaluation Modules & Boards 

Software (2)



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