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Home » NEWEST Products » New by Manufacturer » Texas Instruments » AFE4300 Analog Front End - TI
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Texas Instruments AFE4300 Analog Front End
Texas Instruments AFE4300 Analog Front End

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Texas Instruments AFE4300 Analog Front End

Texas Instruments AFE4300 Analog Front End incorporates two separate signal chains: one chain for weight-scale measurement and the other for body composition measurement analysis. A 16-bit, 860-SPS analog-to-digital converter is multiplexed between both chains. The weight measurement chain of the TI AFE includes an instrumentation amplifier with the gain set by an external resistor, followed by a 6-bit digital-to-analog converter for offset correction, and a circuit to drive the external bridge/load cell with a fixed 1.7V for ratiometric measurements. AFE4300 can also measure body composition by applying a sinusoidal current into the body. The sinusoidal current is generated with an internal pattern generator and a 6-bit, 1-MSPS DAC. A voltage-to-current converter applies this sinusoidal current into the body, between two terminals. The voltage created across these two terminals as a result of the impedance of the body is measured back with a differential amplifier, rectified, and its amplitude is extracted and measured by the 16-bit ADC.

Weight-Scale Front-End Features
  • Supports up to Four Load Cell Inputs
  • On-Chip Load Cell 1.7V Excitation Voltage for Ratiometric Measurement
  • 68nVrms Input-Referred Noise (0.1Hz to 2Hz)
  • Best-Fit Linearity: 0.01% of Full-Scale
  • Weight-Scale Measurement: 540µA
Body Composition Front-End Features
  • Supports Up To Three Tetra-Polar Complex Impedance Measurements
  • 6-Bit, 1MSPS Sine-Wave Generation Digital-to-Analog Converter (DAC)
  • 375µArms, ±20% Excitation Source
  • Dynamic Range: 0Ω to 2.8kΩ
  • 0.1Ω Measurement RMS Noise in 2Hz BW
  • Body Composition measurement: 970µA

Block Diagram
Block Diagram

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