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Maxim’s Ultra-Low-Power Bioimpedance Analog Front End Is Targeting Wearables

Written by Stephen Vicinanza

Maxim’s MAX30009 is a Bioimpedance (BioZ) Analog Front-End (AFE) solution for wearable applications in clinical settings. The performance factor is high for clinical, wellness, and fitness applications.  The  AFE solution has ultra-low power for a long battery lifecycle. The BioZ receive channel has Electrostatic Discharge (ESD) protection, Electromagnetic Interference (EMI) filtering, internal lead biasing, DC lead-off detection, and DRVN lead-off detection. It also has ultra-low power lead-on detection during standby mode. The BioZ receive channel also features

  • high input impedance
  • low noise
  • programable gain
  • Common-Mode Rejection Ratio (CMRR)
  • Various low-pass and high-pass filters
  • Two high-resolution analogs to digital converters
    • Allows for simultaneous I and Q acquisition

The BioZ transmit channel features

  • Sine wave current generator
    • Drive AC Current with a Frequency between
      • 16Hz to 806kHz
    • Magnitude range
      • 16nARMS to 1.28mARMS

The transmit channel can also operate in a sine-wave voltage and H-bridge modes. The I/O MUX is flexible and allows for both bipolar and tetrapolar measurements containing multiple electrodes.

When measurement requires absolute impedance accuracy in the case of Bioimpedance Analysis/Spectroscopy (BIA/BIS) and Automated External Defibrillator (AED) body impedance, there are several calibration options for the MAX30009. A precision resistor can be connected to the calibration port through the four-wire port for extremely high accuracy. The internal trimmed resistors also provide high accuracy.

The Max30009 is especially appropriate in remote patient monitoring scenarios. The Max30009 reduces the overall size of monitoring devices, offering clinical-grade vital sign measurement of bioimpedance analysis for patient health assessment. It is also built to be used in wellness wearables and medical-grade patches.

The monitoring of vital signs, carrying a chest patch or stress monitor requires the device to be small and light, and perform as many functions as possible with the highest accuracy. The need for a tiny battery that can last as long as possible, is a necessity. The Max30009 is Maxim’s premiere AFE on-chip and claimed to lower power consumption by over 50% in body-worn patches and vital signs monitoring devices. The results are extended life cycles of those devices.

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Maxim is part of Analog Devices Inc. the company also offers an Evaluation Kit and full documentation. The full datasheet can be found here

Maxim Integrated | maximintegrated.com

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For the past 8 years, I have been writing about embedded technologies, added to my technical, academic, and medical editorial experience, with companies like Elsevier and Cambridge University Press. I tell people to read what I write, not try to pronounce my last name. I am always available for comments and suggestions you can reach me at product-editor@circuitcellar.com and I promise I will take the time to reach back out to you. I live in the North East with my wonderful family.

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Maxim’s Ultra-Low-Power Bioimpedance Analog Front End Is Ta…

by Stephen Vicinanza time to read: 1 min