AFE4404
Ultra-Small Integrated AFE for Wearable, Optical Heart-Rate Monitoring and Biosensing
AFE4404
- Transmitter:
- Supports Common Anode LED Configuration
- Dynamic Range: 100 dB
- 6-Bit Programmable LED Current to 50 mA (Extendable to 100 mA)
- Programmable LED On-Time
- Simultaneous Support of 3 LEDs for Optimized SPO2, HRM, or Multi-Wavelength HRM
- Receiver:
- 24-Bit Representation of the Current Input from a Photodiode in Twos Complement Format
- Individual DC Offset Subtraction DAC at TIA Input for Each LED and Ambient Phase
- Digital Ambient Subtraction at ADC Output
- Programmable Transimpedance Gain:
10 kΩ to 2 MΩ - Dynamic Range: 100 dB
- Average Current Less Than 200 µA for PPG Signal Acquisition
- Pulse Frequency: 10 SPS to 1000 SPS
- Flexible Pulse Sequencing and Timing Control
- Flexible Clock Options:
- External Clocking:
4-MHz to 60-MHz Input Clock - Internal Clocking: 4-MHz Oscillator
- External Clocking:
- I2C Interface
- Operating Temperature Range: –20°C to 70°C
- 2.6-mm × 1.6-mm DSBGA Package, 0.5-mm Pitch
- Supplies: Rx: 2 V to 3.6 V, Tx: 3 V to 5.25 V,
IO: 1.8 V to 3.6 V
The AFE4404 is an analog front-end (AFE) for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be read out using an I2C interface. The AFE also has a fully-integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | AFE4404 Ultra-Small, Integrated AFE for Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing datasheet (Rev. D) | PDF | HTML | 01 Dec 2016 |
White paper | Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) | PDF | HTML | 30 Apr 2024 | |
User guide | AFE4404 Development Guide (Rev. A) | 17 Dec 2015 | ||
Technical article | Offset correction improves the next generation of heart-rate smart watches | PDF | HTML | 24 Aug 2015 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
AFE4404EVM — AFE4404 Ultra-Small Integrated AFE for Wearable Optical Heart-Rate Monitoring Evaluation Module
The AFE4404EVM is intended for evaluating TI's AFE4404 device. The fully integrated AFE is ideally suited for pulse oximeter and heart rate monitoring applications. It consists of a low noise receive channel and LED transmit section. The AFE4404 has a very highly configurable timing (...)
SLAC718 — AFE4404EVM Firmware Source v1.5
Supported products & hardware
Products
Biosensing AFEs
Hardware development
Evaluation board
SLAC704 — AFE4404EVM GUI v1.2.2
Supported products & hardware
Products
Biosensing AFEs
Hardware development
Evaluation board
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
DSBGA (YZP) | 15 | Ultra Librarian |
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Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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