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AFE4900 Ultra Low Power  烨弘轩电子优势供应 AFE4900YZR   AFE4900YZT    有现货 可添加我们联系方式获取最优惠价格

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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.

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

• PPG Transmitter:

• 20-mA Setting, 60-µs Pulse Duration,
  25-Hz Sampling Rate

• Four LEDs in Common Anode Configuration

• 8-Bit LED Current Up to 200 mA

• Mode to Fire Two LEDs in Parallel

• Programmable LED On-Time

• Simultaneous Support of Three LEDs for SpO2, or Multiwavelength HRM

• Average Current of 30 µA Adequate for a 
  Typical Heart-Rate Monitoring Scenario:

• Clocking Using an External or Internal Clock

• FIFO With 128-Sample Depth for ECG and PPG

• I2C, SPI™ Interfaces: Selectable by Pin

• Operating Temperature Range: –20°C to +70°C

• 2.6-mm × 2.1-mm, 0.4-mm Pitch DSBGA Package

• Supplies:

• Rx: 1.8 V to 1.9 V (LDO Bypass),
  2.0 V to 3.6 V (LDO Enabled)

• Tx: 3 V to 5.25 V

• IO: 1.7 V to Rx_SUP

深圳市烨弘轩电子有限公司，我司2011年成立于中国经济特区深圳.我司专注于为全球电子企业提供优质的电子零件供应服务，竭力打造全球品牌元器件零售与批量供应中心。专业经营各类电子元器件（集成电路IC，存储芯片，分立器件,电源,无源元件,连接器,继电器,传感器,光电子,开关,保险元件,紧固件,开发工具,变压器,测试与测量等）。 我们以低成本提供全方位一站式电子元件供应链采购方案，包括但不仅限于电子元件紧急物料搜寻，电子元件齐套供应、电子元件降低成本的长期供应，库存寄售等一系列供应链解决方案。优势供应各类电子组件.

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销售经理：朱宜华    深圳市烨弘轩电子有限公司   深圳市福田区上步工业区204栋5楼东座516室 

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