供应AFE4900YZR 优势库存大特价

AFE4900YZR制造商: Texas Instruments

产品种类: 模拟前端 – AFE

系列: AFE4900

类型: Ultra Low Power

分辨率: 24 bit

采样比: 1 kS/s

通道数量: 3 Channel

接口类型: I2C, SPI

电源电压-最大: 5.25 V

电源电压-最小: 1.7 V

最小工作温度: - 20 C

最大工作温度: + 70 C

AFE4900YZR 安装风格: SMD/SMT

封装 / 箱体: DSBGA-30

封装: Reel

特点: Optical biosensing  

产品: Analog Front End  

商标: Texas Instruments  

产品类型: Analog Front End - AFE  

工厂包装数量: 3000  

AFE4900YZR描述

The AFE4900 device is an analog front-end (AFE) for synchronized electrocardiogram (ECG), photoplethysmogram (PPG) signal acquisition. 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 PPG signal chain supports up to four switching light-emitting diodes (LEDs) and up to three photodiodes (PDs). The LEDs can be switched on using a fully integrated LED driver. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ECG signal chain has an instrumentation amplifier (INA) with a programmable gain that interfaces to the same ADC. A right-leg drive (RLD) amplifier set can be used to the bias for the ECG input pins. AC and dc lead-off detect schemes are supported. The ADC codes from the PPG and ECG phases can be stored in a 128-sample first in, first out (FIFO) block and read out using either an I2C or a serial programming interface (SPI) interface.

AFE4900YZR特性

Synchronized PPG, ECG Signal Acquisition at Data Rates Up to 1 kHz

ECG Signal Chain:

Standalone ECG Acquisition Up to 4 kHz

Input Bias: 1-Lead ECG With RLD Bias

Programmable INA Gain: 2 to 12

Input Noise (1 Hz to 150 Hz): 2.5 μVrms at 1 kHz, 1.25 μVrms at 4-kHz Data Rate

AC, DC Lead-Off Detect: 12.5-nA to 100-nA

PPG Receiver:

Supports Three Time-Multiplexed PD Inputs

24-Bit Representation of Current From PD

DC Offset Subtraction DAC (Up to ±126-μA) at TIA Input for Each LED, Ambient

Digital Ambient Subtraction at ADC Output

Noise Filtering With Programmable Bandwidth

Transimpedance Gain: 10 kΩ to 2 MΩ

Dynamic Range Up to 100 dB

Receiver Operates in PPG-Only mode at Approximately 1-μA/Hz Sampling Rate

Power-Down Mode: Approximately 0 μA