Firmware
AFE4400
Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters
Data sheet
AFE4400
- Fully-Integrated Analog Front-End for Pulse Oximeter Applications:
- Flexible Pulse Sequencing and
Timing Control
- Flexible Pulse Sequencing and
- Transmit:
- Integrated LED Driver
(H-Bridge, Push, or Pull) - Dynamic Range: 95 dB
- LED Current:
- Programmable to 50 mA with 8-Bit Current Resolution
- Low Power:
- 100 µA + Average LED Current
- Programmable LED On-Time
- Independent LED2 and LED1 Current Reference
- Integrated LED Driver
- Receive Channel with High Dynamic Range:
- 13 Noise-Free Bits
- Low Power: < 670 µA at 3.3-V Supply
- Integrated Digital Ambient Estimation and Subtraction
- Flexible Receive Sample Time
- Flexible Transimpedance Amplifier with Programmable LED Settings
- Integrated Fault Diagnostics:
- Photodiode and LED Open and
Short Detection - Cable On and Off Detection
- Photodiode and LED Open and
- Supplies:
- Rx = 2.0 V to 3.6 V
- Tx = 3.0 V to 5.25 V
- Package: Compact VQFN-40 (6 mm × 6 mm)
- Specified Temperature Range: 0°C to 70°C
The AFE4400 is a fully-integrated analog front-end (AFE) ideally suited for pulse oximeter applications. The device consists of a low-noise receiver channel with an integrated analog-to-digital converter (ADC), an LED transmit section, and diagnostics for sensor and LED fault detection. The device is a very configurable timing controller. This flexibility enables the user to have complete control of the device timing characteristics. To ease clocking requirements and provide a low-jitter clock to the AFE4400, an oscillator is also integrated that functions from an external crystal. The device communicates to an external microcontroller or host processor using an SPI™ interface.
The device is a complete AFE solution packaged in a single, compact VQFN-40 package (6 mm × 6 mm) and is specified over the operating temperature range of 0°C to 70°C.
Technical documentation
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View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | AFE4400 Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters datasheet (Rev. H) | PDF | HTML | 24 Jul 2014 |
| White paper | Fortschrittliche Halbleitertechnologie für moderne Telemedizin-Anwendungen | 28 Oct 2020 | ||
| White paper | 持續進化的現代遠距照護應用半導 體技術 | 28 Oct 2020 | ||
| White paper | Evolving Semiconductor Technologies for Modern Telehealth Applications | 26 Oct 2020 | ||
| EVM User's guide | AFE44x0SPO2EVM User's Guide (Rev. C) | 27 May 2014 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
AFE4400SPO2EVM — AFE4400 Integrated AFE for Heart-Rate Monitors and Low-Cost Pulse Oximeters Evaluation Module
The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The (...)
User guide: PDF
Evaluation board
AFE4490SPO2EVM — AFE4490 Integrated Analog Front End (AFE) for Pulse Oximeters Evaluation Module
The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The (...)
User guide: PDF
GUI for evaluation module (EVM)
SLAC556 — AFE44x0SPO2EVM GUI v2.4
Supported products & hardware
Products
Biosensing AFEs
Hardware development
Evaluation board
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RHA) | 40 | Ultra Librarian |
Ordering & quality
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Information included:
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