1g Resolution over 15kg Range Sub-100nVpp Noise Front-End Reference Design
TIDA-00765
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Key Document

Description

TIDA-00765 is a less than 100nVpp analog front end for resistive strain gauge bridge load cell-based weight and vibration measurement. It is ideally suited for appliances, which require high-resolution due to large dynamic range or have considerable weight offset. In the face of significant levels of switching supply noise and rapid temperature changes, drift and interference are common issues in harsh environments. The design’s high integration, AC excitation, and robust filtering suppress drift and interference to ensure consistent performance in tough environments.

Features
  • Captures outputs of both multiple and single resistive strain gauge-based load cell bridges simultaneously
  • Consistent <100nVpp low-noise performance
  • <5-μV total error from 0ᵒC to 85ᵒC
  • AC excitation robustly eliminates drift introduced by parasitic thermocouples and other causes
  • Highly robust to >500mVpp 100-kHz switching-supply noise
  • Captures vibrations up to 500 Hz with sample rate ≤2 kSps

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1220  24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
CSD13381F4  12-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6mm, 180 mOhm, gate ESD protection  MOSFETs  Sample & Buy Not Available
CSD23381F4  -12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 1 mm, 175 mOhm, gate ESD protection  MOSFETs  Sample & Buy Not Available
LMT01  0.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
LP5907  250-mA, low-noise, high-PSRR, ultra-low-dropout voltage regulator with low IQ and enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
MSP430G2553  16 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
TPD4E1U06  Quad 0.8-pF, 5.5-V, ±15-kV ESD protection diode in SOT-23 & SC70 packages  Circuit protection ICs  Sample & Buy View Design Kits & Evaluation Modules
TS5A21366  0.75-Ω on-state resistance, 5-V, 1:1 (SPDT), 2-channel analog switch with 1.8-V input logic  Switches & multiplexers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1220 Download Download
Download Download
LMT01 Download -
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LP5907 Download Download
Download -
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MSP430G2553 Download
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TPD4E1U06 Download
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TS5A21366 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2475 14 Jun 2016
Design files (6)
Title Type Size (KB) Date
ZIP 3319 01 Apr 2016
ZIP 434 01 Apr 2016
PDF 1764 01 Apr 2016
PDF 250 01 Apr 2016
PDF 63 01 Apr 2016
PDF 690 01 Apr 2016
More literature (1)
Title Type Size (KB) Date
ZIP 4256 01 Apr 2016
Related Tools & Software

Reference Designs (1)

Hardware development (2)

Name Part Number Tool Type
ADS1220 evaluation module  ADS1220EVM  Evaluation board 
MSP430G2 LaunchPad Development kit  MSP-EXP430G2  Evaluation board 

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