سنسور و مبدل سنسور تخصصی

Product Attributes

Introduction

The MAX86140/MAX86141 are ultra-low-power, completely integrated, optical data acquisition systems. On the transmitter side, the MAX86140/MAX86141 have three programmable high-current LED drivers that can be configured to drive up to six LEDs using an external 3x2:1 mux. With two MAX86140/MAX86141 devices working in controller-target mode, the LED drivers can drive up to twelve LEDs using an external 3x2:1 mux. On the receiver side, MAX86140 consists of a single optical readout channel, while the MAX86141 has two optical readout channels that can operate simultaneously. The devices have low-noise signal conditioning analog frontend (AFE) including 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detect and replace function. Due to the low power consumption, compact size, ease of use, and industry-lead ambient light rejection capability of MAX86140/MAX86141, the devices are ideal for a wide variety of optical-sensing applications, such as pulse oximetry and heart rate detection. The MAX86140/MAX86141 operate on a 1.8V main supply voltage and a 3.1V to 5.5V LED driver supply voltage. Both devices support a standard SPI compatible interface and fully autonomous operation. Each device has a large 128-word built-in FIFO. The MAX86140/MAX86141 is available in compact wafer-level package (WLP) (2.048x1.848mm) with 0.4mm ball pitch.

Features

• Complete Single and Dual-Channel Optical Data Acquisition System
• Optimized Architecture for Transmissive and Reflective Heart Rate or SpO₂ Monitoring
• Low Dark Current Noise of <50pA RMS (Sample to Sample Variance)
• Lower Effective Dark Current Noise Achievable Through Multiple Sample Modes and On-Chip Averaging
• High-Resolution, 19-Bit Charge Integrating ADC
• Three Low-Noise, 8-Bit LED Current DACs
• Excellent Dynamic Range >89dB in White Card Loop-Back Test (Sample-to-Sample Variance)
• Dynamic Range Extendable to >104dB for SpO₂ and >110dB for HRM with Multiple Sample Modes and On-Chip Averaging
• Excellent Ambient Range and Rejection Capability

  • 100μA Ambient Photodetector Current

  • 70dB Ambient Rejection at 120Hz

• Ultra-Low-Power Operation for Wearable Devices
  • Low-Power Operation, Optical Readout Channel <10μA (typ) at 25sps
  • Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs
  • Low Shutdown Current =0.6μA (typ)
• Rejection of Fast Ambient Transients
• Miniature 2.048x1.848mm, 5x4 0.4mm Ball Pitch WLP
• -40℃ to +85℃ Operating Temperature Range

Applications

• Wearable Devices for Fitness, Wellness and Medical Applications
• Optimized for Wrist, Finger, Ear, and Other Locations
• Optimized Performance to Detect
  • Optical Heart Rate
  • Oxygen Saturation (SpO₂)
  • Muscle Oxygen Saturation [smO₂ and StO₂]