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Analog Devices / Maxim Integrated MAX86178 Ultra-Low-Power Medical AFE Sensor

Analog Devices MAX86178 Ultra-Low-Power Medical-Grade AFE Sensor is a highly integrated, multiple vital-sign monitoring device with a complete photoplethysmogram (PPG), electrocardiogram (ECG), and biopotential (BioZ) analog front-end (AFE) for wearable applications. The three sensor channels are synchronized. The PPG data acquisition system supports up to six LEDs and four photodiode inputs, and the LEDs are programmable from two high-current, 8-bit LED drivers. The ECG channel features EMI filtering, internal lead biasing, right-leg drive, and extensive calibration voltages for built-in self-testing. The BioZ receive channel has EMI filtering and extensive calibration features with high input impedance, low noise, programmable gain, low-/high-pass filter options, and a high-resolution ADC.

Analog Devices MAX86178 Ultra-Low-Power Medical-Grade AFE Sensor offers DC and AC lead-off detection, a flexible timing system, and a phase-locked loop (PLL) with a -40°C to +85°C operating temperature range. It comes housed in a 2.77mm x 2.57mm, 49-bump wafer-level package (WLP). The MAX86178 provides high-performance wellness and clinical applications with low power for extended battery life.

Features

  • PPG
    • Dual-channel optical data-acquisition system, 115dB SpO2 system SNR, 112dB SNR at 16µA
    • Excellent ambient range and rejection capability
      • >200µA ambient photodetector current
      • >90dB ambient rejection at 120Hz with averaging
  • ECG
    • Clinical-grade ECG acquisition system
      • 15.6 ENOB with 0.6μVRMS (0.05Hz to 40Hz)
      • 230fARMS input-current noise (0.05Hz to 40Hz, +25°C)
    • Fully differential signal with CMRR, >110dB at 50Hz and 60Hz
    • High input impedance, >1GΩ for extremely low common-to-differential mode conversion
    • High DC differential input range of ±1300mV (1.8V typical) allows a wide variety of electrodes to be used
    • High AC dynamic range of 200mVP-P prevents saturation due to motion or varying half-cell potentials
  • BIOZ
    • High-performance BioZ data acquisition system
    • Low-noise BioZ receive channel (17 ENOB, 0.16μVRMS)
    • Sine-wave, square-wave, current and voltage Stimulus, 16Hz to 500kHz BIA/BIS measurement with high absolute resistance and reactance accuracy
  • System
    • Ultra-low-power systems for wearable devices
    • DC and AC lead-off detect capability
    • Shutdown current of 0.5μA typical
    • 256-word FIFO for ECG, PPG, and BioZ
    • Flexible interrupt and multi-AFE synchronization
    • FIFO timing data allows synchronized PPg, ECG, and BioZ

Applications

  • Ambulatory heart monitors
  • Impedance cardiography/hemodynamic monitors
  • Pulse arrival time (PAT), pulse travel time (PTT), and pulse wave velocity (PWV) assessments
  • Pulse-oximetry devices
  • Single- and multi-frequency bioimpedance analysis
  • Smart clothing
  • Wearable vital-sign monitors

Specifications

  • 0.12µA ISUPPLY typical
  • 0.005µA typical shutdown mode supply current
  • 2.3V to 5.5V VSUPPLY range
  • 20ADC resolution (bits)
  • 115dB SNR
  • -40°C to +85°C operating temperature range
  • 2.77mm x 2.57mm, 49-pin WLP package
Publicado: 2021-09-22 | Actualizado: 2024-02-09