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AFE4300 Datasheet Integrated Analog Front-End

Manufacturer: Texas Instruments

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General Description

The AFE4300 is a low-cost analog front-end incorporating two separate signal chains: one chain for weight-scale (WS) measurement and the other for body composition measurement (BCM) analysis.

A 16-bit, 860-SPS analog-to-digital converter (ADC) is multiplexed between both chains.

The weight measurement chain includes an instrumentation amplifier (INA) with the gain set by an external resistor, followed by a 6-bit digital-to-analog converter (DAC) for offset correction, and a circuit to drive the external bridge/load cell with a fixed 1.7 V for ratiometric measurements.

Overview

Product Folder Order Now Technical Documents Tools & Software Support & Community AFE4300 Low-Cost, Integrated Analog Front-End for Weight-Scale and Body Composition Measurement AFE4300 SBAS506 – AUGUST 2019.

Key Features

  • 1 Weight-scale front-end:.
  • Supports up to four load cell inputs.
  • On-chip load cell 1.7-V excitation voltage for ratiometric measurement.
  • 68-nVrms Input-Referred noise (0.1 Hz to 2 Hz).
  • Best-fit linearity: 0.01% of full-scale.
  • Weight-scale measurement : 540 µA.
  • Body composition front-end:.
  • Supports up to three tetra-polar complex impedance measurements.
  • 6-Bit, 1-MSPS sine-wave generation digital-toanalog converter (D.

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