Datasheet > AFE4950

AFE4950

更新时间： 2024-09-19 02:52:11

品牌	Logo	应用领域
德州仪器 - TI		监控
页数	文件大小	规格书
8页	977K
描述
AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and Electrical Bio-sensing

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AFE4950 数据手册

AFE4950

_{SBASA37A – JUNE 2020 – REVISED OCT}A_OBF_EE_R4₂9₀5₂0₀

SBASA37A – JUNE 2020 – REVISED OCTOBER 2020

www.ti.com

AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring,

SpO2 and Electrical Bio-sensing

•

Acquire data synchronized with system master

clock

1 Features

•

Supports simultaneous & synchronized acquisition

of up to 24 PPG and a single-lead ECG signal.

Flexible allocation of 8 LED, 4 PD in each phase

ECG signal chain:

– 1-lead ECG signal acquisition up to 2 kHz

– RLD output to drive a third electrode

– Input noise : 0.7 µV-rms

– Supports up to +/- 0.65 V differential DC offset

and +/-0.55 V common mode range

– Programmable INA gain: 11, 21

– High-pass filter with quick saturation recovery

– Integrated 300 Hz anti-aliasing low pass filter

– AC, DC lead-off detect: 2.6-nA to 85-nA

– Low power continuous lead-on detection

Impedance signal chain

– Continuous low-power monitoring of impedance

between 2 electrodes

– 7 MΩ range

– 300 Ω noise on 620 kΩ

PPG Transmitter:

– 8-Bit Programmable LED Current with range

adjustable from 25 mA to 250 mA

– Mode to fire two LEDs in parallel

– Support of 8 LEDs in Common Anode

configuration for SpO2, Multi-Wavelength HRM

PPG Receiver:

– 2 parallel receivers (two sets of TIA/ filter)

– Supports 4 Time-Multiplexed Photodiode Inputs

to each Receiver

•

FIFO with 256-sample Depth

SPI, I²C interfaces: Selectable by pin

2.6-mm × 2.5-mm DSBGA, 0.4-mm Pitch

Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9-3.6V

(LDO Enabled), Tx:3-5.5V, IO:1.7-RX_SUP

•

2 Applications

•

Optical Heart-Rate Monitoring (HRM) for

Wearables, Hearables

High performance ECG signal acquisition

Synchronized PPG, ECG for BP estimation

Heart-rate variability (HRV)

•

Pulse oximetry (SpO₂) measurements

3 Description

•

The AFE4950 device is an analog front-end (AFE) for

synchronized signal acquisition of PPG and ECG

signals. The device can also be used for optical bio-

sensing applications, such as heart-rate monitoring

(HRM) and saturation of peripheral capillary oxygen

(SpO2). The ECG signal chain supports 2- and 3-

electrode configurations and has an integrated Right

leg drive (RLD) buffer. The ECG signal chain can also

be used to do a continuous, low-power monitoring of

the impedance between pair of electrodes.

Device Information

PART NUMBER

AFE4950

PACKAGE⁽¹⁾

BODY SIZE (NOM)

•

DSBGA (36)

2.60 mm × 2.50 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

– 8-bit Ambient Offset subtraction at each TIA

input with 256 µA range

– 8-bit LED Offset Subtraction DAC with 64 µA

range

– Automatic ambient cancellation and dynamic

LED DC cancellation at TIA input

– Ambient rejection close to 100 dB up to 10 Hz

– Noise filtering with programmable bandwidth

– Trans-impedance Gain: 3.7 kΩ to 1 MΩ

Accurate, Continuous Heart-Rate Monitoring:

– System SNR up to 109-dB at 16 µA PD current

– Low Current for Continuous Operation on a

Wearable Device with a Typical Value: 15-μA

for an LED, 20-μA for the Receiver

External clock and internal oscillator modes

•

Simplified Schematic

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

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Product Folder Links: AFE4950

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与AFE4950相关器件

型号	品牌	获取价格	描述	数据表
AFE4950_V01	TI	获取价格	AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and E
AFE4950_V02	TI	获取价格	AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and E
AFE4950YBGR	TI	获取价格	AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and E
AFE4950YBGT	TI	获取价格	AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and E
AFE4960	TI	获取价格	具有集成式呼吸和起搏信号检测功能的双通道 ECG 模拟前端
AFE4960P	TI	获取价格	具有集成式呼吸和起搏信号检测功能的双通道 ECG 和 PPG 模拟前端
AFE4960PYBGR	TI	获取价格	具有集成式呼吸和起搏信号检测功能的双通道 ECG 和 PPG 模拟前端 \| YBG \| 3
AFE4960PYBGT	TI	获取价格	具有集成式呼吸和起搏信号检测功能的双通道 ECG 和 PPG 模拟前端 \| YBG \| 3
AFE4960YBGR	TI	获取价格	具有集成式呼吸和起搏信号检测功能的双通道 ECG 模拟前端 \| YBG \| 36 \| -4
AFE4960YBGT	TI	获取价格	具有集成式呼吸和起搏信号检测功能的双通道 ECG 模拟前端 \| YBG \| 36 \| -4

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