AFE4900
- 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: 2.15 to 12.92
- 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
- IEC 60601 Test report available on request
- 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:
- 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:- 20-mA Setting, 60-µs pulse duration,
25-Hz sampling rate
- 20-mA Setting, 60-µs pulse duration,
- Clocking using an external or internal clock
- FIFO with 128-sample depth for ECG and PPG
- I2C, SPI interfaces: selectable by pin
- 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
- Rx: 1.8 V to 1.9 V (LDO bypass),
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.
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技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | AFE4900 Ultra-low Power, Integrated AFE for Wearable Optical, Electrical Bio-sensing with FIFO datasheet (Rev. B) | PDF | HTML | 2019年 7月 30日 |
| Technical article | Designing compact, efficient and high performing multiparameter patient monitors | PDF | HTML | 2019年 6月 25日 | |
| Technical article | No strings attached: Creating next-generation wireless patient monitors | PDF | HTML | 2018年 6月 29日 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| DSBGA (YZ) | 30 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。