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Product details

Parameters

Number of input channels 2 Resolution (Bits) 16 Number of LEDs 0 Features Biosensing 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

Features

  • 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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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.

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

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 7
Type Title Date
* Datasheet AFE4300 Low-Cost, Integrated Analog Front-End for Weight-Scale and Body Composition Measurement datasheet Aug. 16, 2019
Technical articles Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
Technical articles Life-saving technologies to the rescue Mar. 06, 2014
Technical articles A new way to illuminate the human condition Dec. 30, 2013
Technical articles Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Application notes Impedance Measurement with AFE4300 Oct. 09, 2013
User guides 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

EVALUATION BOARDS Download
document-generic User guide
199
Description

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 (...)

Features
  • 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

FIRMWARE Download
SLAC681.ZIP (3829 KB)

Design tools & simulation

SIMULATION MODELS Download
SBAM155.ZIP (19 KB) - IBIS Model
SIMULATION TOOLS Download
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 (...)
Features
  • 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

REFERENCE DESIGNS Download
Biometric Steering Wheel Reference Design
TIDA-00292 This reference design is for a concept demonstration of how a driver's pulse rate, respiration rate, and ECG based heart rate can be obtained from a vehicle steering wheel.  AFE4400 and AFE4300 from TI's biometric family of analog front-ends (AFE), enables acquisition of all three parameters via (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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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