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說明
The MAX86140 is an ultra-low-power, completely integrated, optical data acquisition system. On the transmitter side, the MAX86140 has three programmable high-current LED drivers that can be configured to drive up to six LEDs. With two MAX86140 devices working in master-slave mode, the LED drivers can drive up to twelve LEDs. On the receiver side, MAX86140 has a low-noise signal conditioning analog front-end (AFE) including a 19-bit ADC, an industry-lead ambient light cancellation (ALC) circuit, and a picket fence detect and replace algorithm. Due to the low power consumption, compact size, easy/flexible-to-use and industry-lead ambient light rejection capability of MAX86140, the device is ideal for a wide variety of optical sensing applications, such as pulse oximetry andheart rate detection.
TheMAX86140operates on a 1.8V main supply voltage and a 3.1~5.5V LED driversupply voltage. The device supports a standard SPI compatible interface and fully autonomous operation. The device has a large 128-word built-in FIFO. The MAX86140is available in a compact wafer-level package (WLP) (2.048mm x 1.848mm) with 0.4mm ball pitch.
Complete Single-Channel,Optical Data Acquisition System
Built-in Algorithm Further Enhances Rejection of Fast Ambient Transients
Optimized Architecture for Transmissive and Reflective Heart Rateor SpO2Monitoring
Low Dark Current Noise of < 50pA RMS (Sample to Sample Variance)
Lower Effective Dark Current NoiseAchievable 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 >90dB inWhite Card Loop-Back Test (Sample-to-Sample Variance)
Dynamic Range Extendable to >104dB for SpO2and >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 Operationfor Body Wearable Devices
Low-Power Operation, Optical Readout Channel <10μA Typical at 25sps
Short Exposure Integration Period of 14.8μs, 29.4μs, 58.7μs, 117.3μs
Low Shutdown Current =20μWTypical
Built-in Algorithm Further Enhances Rejection of Fast Ambient Transients
Miniature 2.048 x 1.848mm,5 x 40.4mm Ball PitchWLP
-40°C to +85°C Operating Temperature Range
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