Datasheet > AFE49I30YZT

AFE49I30YZT

更新时间： 2024-11-08 11:11:59

品牌	Logo	应用领域
德州仪器 - TI		先进先出芯片
页数	文件大小	规格书
7页	724K
描述
用于可穿戴式光学生物传感、具有 FIFO、I2C 和 ECG 的超低功耗集成 AFE \| YZ \| 30 \| -40 to 85

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AFE49I30

SBASA49 –MAY 2020

AFE49I30 Ultra-Small, Integrated AFE With FIFO for Multi-Sensor Wearable, Optical Heart-

Rate Monitoring and Bio-sensing

1 Features

•

Supports external clock and internal oscillator

modes

•

Supports signal acquisition of up to 24 phases

•

Option to acquire data synchronized with a system

master clock

Flexible allocation of 6 LED, 4 PD in each PPG

phase

•

Automatic cancellation of DC from ambient, LED

FIFO with 128-sample depth

•

Synchronized PPG/ECG signal acquisition with

each phase configurable as PPG or ECG, and at

different data rates

I²C interface

Synchronized PPG/ECG supports up to 1 kHz

data rate

2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch

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

V (LDO enabled), Tx: 3 V-5.5 V, IO: 1.7-3.6 V

•

ECG-only mode supports up to 4 kHz data rate

PPG signal chain:

•

Supports operation with 2 supplies - 1.8 V, 5 V

–

System SNR up to 108-dB at 16 μA PD current

2 Applications

Low current for continuous operation on a

wearable device with a typical value: 15 μA for

an LED, 20 μA for the receiver

•

ECG on a wearable device

Synchronized PPG, ECG for PTT-based Blood

pressure

•

PPG Transmitter:

•

Optical heart-rate monitoring (HRM) and Heart-

rate variability (HRV) for wearables, hearables

–

Supports common anode LED configuration

8-Bit programmable LED current with range

adjustable from 25 mA to 250 mA

•

Pulse oximetry (SpO₂) measurements

Maximum oxygen consumption (VO₂Max)

–

Mode to fire two LEDs in parallel with

independent per-phase current control

3 Description

–

Programmable LED on-time per-phase

The AFE49I30 is an analog front-end for optical bio-

sensing/ PPG and ECG measurement applications.

The device supports up to six switching light-emitting

diodes (LEDs) and up to four photodiodes. Up to 24

signal phases can be defined and the PPG or ECG

signals can be acquired from each phase in a

synchronized manner.

Simultaneous support of 6 LEDs for SpO₂,

HRM, or multi-wavelength HRM

•

PPG Receiver:

–

Supports 4 time-multiplexed photodiode inputs

2 parallel receivers to sample two PD channels

simultaneously

Device Information⁽¹⁾

–

Individual ambient offset subtraction DAC at

each TIA Input with 8-bit per-phase control and

range adjustable up to 255-μA

PART NUMBER

PACKAGE

BODY SIZE (NOM)

AFE49I30

DSBGA (30)

2.60 mm × 2.10 mm

Individual LED offset subtraction DAC at each

TIA input with 5-bit per-phase control and

15.5-µA range

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

the end of the data sheet.

Simplified Schematic

–

Close to 100 dB ambient rejection up to 10 Hz

Noise filtering with programmable bandwidth

Transimpedance Gain: 3.7 kΩ to 1 MΩ

•

ECG Signal Chain

–

1-lead ECG with RLD output for bias

INA gain programmable from 1.6 – 13

<1 µVrms input noise (in a 1-150 Hz

bandwidth) at 4-kHz sample rate

–

Integrated 450 Hz Low Pass Filter

AC, DC lead-off detect with 3.125-100 nA

current and programmable interrupt

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.

12 3 4 5 6 7

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