High-Resolution, Low-Drift, Precision Weigh-Scale Reference Design with AC Bridge Excitation TIPD188 (ACTIVE)

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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.

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Schematic/Block Diagram

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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 38-kSPS 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 38-kSPS 10-ch delta-sigma ADC with PGA, VREF and auxiliary 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  Microcontrollers (MCU)  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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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1692 15 Feb 2019
Design files (2)
Title Type Size (KB) Date
PDF 193 20 Jul 2015
PDF 176 20 Jul 2015
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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