Product details

Applications Body composition measurements for weight scales Number of input channels 2 Resolution (Bits) 16 Number of LEDs 0 Interface type SPI Operating temperature range (C) 0 to 70
Applications Body composition measurements for weight scales Number of input channels 2 Resolution (Bits) 16 Number of LEDs 0 Interface type SPI Operating temperature range (C) 0 to 70
LQFP (PN) 80 196 mm² 14 x 14
  • 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-to-analog converter (DAC)
    • 247.5-µArms, ±20% Excitation source
    • 0.1-Ω Measurement RMS noise in 2-Hz BW
    • Body composition measurement : 970 µA
  • Analog-to-digital converter (ADC):
    • 16 Bits, 860 SPS
    • Supply current: 110 µA
  • 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-to-analog converter (DAC)
    • 247.5-µArms, ±20% Excitation source
    • 0.1-Ω Measurement RMS noise in 2-Hz BW
    • Body composition measurement : 970 µA
  • Analog-to-digital converter (ADC):
    • 16 Bits, 860 SPS
    • Supply current: 110 µA

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.

The 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 the amplitude is extracted and measured by the 16-bit ADC.

The AFE4300 operates from 2 V to 3.6 V, is specified from 0°C to +70°C, and is available in a LQFP-80 package.

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.

The 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 the amplitude is extracted and measured by the 16-bit ADC.

The AFE4300 operates from 2 V to 3.6 V, is specified from 0°C to +70°C, and is available in a LQFP-80 package.

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Type Title Date
* Data sheet AFE4300 Low-Cost, Integrated Analog Front-End for Weight-Scale and Body Composition Measurement datasheet PDF | HTML 16 Aug 2019
Technical article Offset correction improves the next generation of heart-rate smart watches 24 Aug 2015
Technical article Life-saving technologies to the rescue 06 Mar 2014
Technical article A new way to illuminate the human condition 30 Dec 2013
Technical article Oximeter signaling: There’s more than meets the eye 04 Dec 2013
Application note Impedance Measurement with AFE4300 09 Oct 2013
EVM User's guide AFE4300EVM-PDK User's Guide (Rev. A) 29 Aug 2012

Design & development

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Evaluation board

AFE4300EVM-PDK — AFE4300 weight-scale and body-composition measurement AFE performance demonstration kit (PDK)

AFE4300EVM-PDK is a platform for evaluating the AFE4300 device. AFE4300 is a low cost Analog-Front-End incorporating two separate signal chains, one targeting weight measurement and the other targeting body composition analysis. The EVM provides access for load cell terminals to support up to four (...)

Firmware

AFE4300EVM-PDK Firmware Source v1.0

SLAC681.ZIP (3829 KB)
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Simulation model

AFE4300PN IBIS Model

SBAM155.ZIP (19 KB) - IBIS Model
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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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