Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters
Product details
Parameters
Package | Pins | Size
Features
- 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
Description
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
Type | Title | Date | |
---|---|---|---|
* | Datasheet | AFE4400 Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters datasheet (Rev. H) | Jul. 24, 2014 |
White paper | Fortschrittliche Halbleitertechnologie für moderne Telemedizin-Anwendungen | Oct. 28, 2020 | |
White paper | 持續進化的現代遠距照護應用半導 體技術 | Oct. 28, 2020 | |
White paper | Evolving Semiconductor Technologies for Modern Telehealth Applications | Oct. 26, 2020 | |
Technical articles | Offset correction improves the next generation of heart-rate smart watches | Aug. 24, 2015 | |
Technical articles | Consumer electronics benefit from analog technology | Jan. 21, 2015 | |
User guide | AFE44x0SPO2EVM User's Guide (Rev. C) | May 27, 2014 | |
Technical articles | Life-saving technologies to the rescue | Mar. 06, 2014 | |
Technical articles | A new way to illuminate the human condition | Dec. 30, 2013 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
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 (...)
Features
- DB9 pulse oximeter sensor cable support
- Acquire data at up to 3000Hz in evaluation mode
- USB based power and PC application connectivity
- Access to all AFE44x0 registers via an easy to use GUI
Description
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 (...)
Features
- DB9 pulse oximeter sensor cable support
- Acquire data at up to 3000 Hz in evaluation mode
- USB based power and PC application connectivity
- Access to all AFE44x0 registers via an easy to use GUI
Software development
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
Design files
-
download TIDA-00292 BOM.pdf (120KB) -
download TIDA-00292 PCB Layout.zip (5840KB) -
download TIDA-00292 Gerber.zip (1520KB)
Design files
-
download TIDA-00011 BOM.pdf (123KB) -
download TIDA-00011 Gerber.zip (3708KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VQFN (RHA) | 40 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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