Product details


Type Bioimpedance spectroscopy (BIS) Number of input channels 2 Resolution (Bits) 16 Number of LEDs 0 Operating temperature range (C) 0 to 70 Interface type SPI open-in-new Find other Biosensing AFEs

Package | Pins | Size

LQFP (PN) 80 196 mm² 14 x 14 open-in-new Find other Biosensing AFEs


  • 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

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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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More information

Full data sheet is available. Request now

Technical documentation

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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

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 (...)

  • Support for up to four load cell inputs
  • Support for three tetra-polar impedance measurements
  • On-board load cell simulation block
  • Acquire data at up to 860 samples/second in data capture mode
  • USB based power and PC application connectivity

Software development

SLAC681.ZIP (3829 KB)

Design tools & simulation

SBAM155.ZIP (19 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

Body Weight Scale Reference Design with Body Composition capability and BLE Connectivity
TIDA-00009 This reference design is for a complete body weight scale end equipment with body composition capability featuring TI signal chain, power, and connectivity components. With TI's AFE4300 weigh scale/body composition AFE, you can accelerate your body weight scale design or quickly add body composition (...)
document-generic Schematic document-generic User guide
Hand-to-Hand Body Composition Meter Reference Design with BLE Connectivity
TIDA-00008 This reference design is for a complete hand-held body composition or fat loss monitor end equipment featuring TI signal chain, power, and connectivity components. With TI's AFE4300 body composition AFE, you can accelerate your body composition design to develop more quickly. This reference design (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
LQFP (PN) 80 View options

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