general deion

　　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) (2.048 x 1.848mm) with 0.4mm ball pitch.

　　benefits and 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 2.048 x 1.848mm, 5 x 4 0.4mm ball pitch wlp

　　●-40°c to +85°c operating temperature range

　　? 李 进

　　? 深圳博瑞图电子科技有限公司

　　?mob :

　　?qq : 52519094

　　?add :深圳市福田区中航路都会轩3305

　　?email : lijin810230@163.com

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