MAX86140/MAX86141 - optical pulse oximeter and heart rate sensor. Free Technical Library News

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MAX86140/MAX86141 Optical Pulse Oximeter and Heart Rate Sensor

04.08.2019

The MAX86140/MAX86141 is a microchip that provides an integrated, ultra-low power optical system for patient data acquisition. On the transmitter side, the microcircuit has three programmable high-current drivers that are configured to drive up to six LEDs. Drivers for two MAX86140/41 devices in master-slave mode can drive up to twelve LEDs. On the receiver side, the MAX86140 has one optical readout channel, and the MAX86141 has two such channels capable of operating simultaneously.

The devices feature an analog interface (AFE) for low-noise signal conversion, including a 19-bit A/D converter, the industry's most advanced Ambient Light Cancellation (ALC) circuitry, and a harsh ambient light edge detection algorithm. Due to the low power consumption, compact size, flexible settings and ease of use, the MAX86140/41 chips are perfect for creating any optical sensors, in particular those used in pulse oximetry and heart rate detection.

The MAX86140/41 chips operate at 1,8V main supply voltage and 3,1...5,5V LED driver supply voltage. They support a standard SPI-compatible interface and are able to work in standalone mode. Each device contains a built-in 128 word FIFO buffer. The MAX86140/41 are available in a 2,048mm x 1,848mm Wafer Level Compact (WLP) package with 0,4mm ball pitch.

Features of MAX86140/41:

Complete optical data acquisition system
Built-in algorithm that compensates for the rapid change in ambient light
Optimized architecture for heart rate or SpO2 sensors
Low dark noise current <50 pA RMS
Reduced dark current noise with multiple sampling and averaging modes
19-bit high resolution integrating ADC
Three 8-bit low noise LED current DACs
Excellent >90dB dynamic range in white card feedback test (sample-to-sample dispersion)
Dynamic range extending to over 104 dB for SpO2 and over 110 dB for HRM with multiple sampling modes and on-chip averaging
Work in a wide range of ambient light:
Ultra-low consumption for battery-powered devices
optical read channel: < 10 µA (typical) at 25 sps
integration period: 14,8 µs, 29,4 µs, 58,7 µs, 117,3 µs
low current in Shutdown mode: 20 μW (typical)
Built-in algorithm that additionally suppresses the influence of fast transients
Miniature case: 2,048x1,848 mm, WLP 5x4 with ball pitch 0,4 mm
Operating temperature range: -40...85°C.

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