AFE4950
- Supports simultaneous and 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: 2.9 nA to 92.5 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
- 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
- Acquire data synchronized with system master clock
- 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
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.
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檢視所有 8 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and Electrical Bio-sensing datasheet (Rev. B) | PDF | HTML | 2021年 7月 15日 |
| Product overview | ECG and Cuffless Blood Pressure Monitoring With Integrated AFE | PDF | HTML | 2023年 10月 30日 | |
| Product overview | Photoplethysmography (PPG) With Integrated AFE for Optical Biosensing | PDF | HTML | 2023年 10月 30日 | |
| Application brief | ECG Signal Acquisition on Wearables | PDF | HTML | 2022年 11月 15日 | |
| Application brief | Measuring Oxygen Saturation (SpO2) on Wearables | PDF | HTML | 2022年 11月 14日 | |
| Application brief | Optical Heart Rate Monitoring (OHRM) on Wearables | PDF | HTML | 2022年 11月 14日 | |
| Application brief | Cuffless Blood Pressure Monitoring on Wearables | PDF | HTML | 2022年 11月 9日 | |
| Technical article | Solving 5 challenges of ECG signal acquisition in wearables | PDF | HTML | 2021年 7月 21日 |
設計與開發
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開發板
AFE4950EVM — 適用於穿戴式光學心率監控之超小型整合式 AFE 的 AFE4950 評估模組
AFE4950 評估模組 (EVM) 旨在加速與 AFE4950 產品相關的評估及系統開發活動。AFE4950 是一款類比前端 (AFE)，用於同步擷取 PPG 和 ECG 訊號。AFE4950 也可用於光學生物感測應用，例如心率監控 (HRM) 與周邊微血管含氧飽和度 (SpO2)。
ECG 訊號鏈支援雙電極和三電極配置，並具有整合的右腳驅動 (RLD) 緩衝器。ECG 訊號鏈還可以改用於對電極之間的阻抗進行連續、低功耗的監測。
驅動程式或資料庫
BSECUR-3P-ALGORITHMS — B SECUR ECG 演算法和電極設計服務
HeartKey is a powerful and accurate set of ECG algorithms, ready for integration into the next generation low power low memory consumer / IoT & medical devices such as smartwatches, smart clothing, medical, automotive, smart home devices and hand-held devices. HeartKey is comprised of advanced (...)
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模擬工具
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| DSBGA (YBG) | 36 | Ultra Librarian |
訂購與品質
內含資訊：
- 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
內含資訊：
- 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。