Firmware
Data sheet
AFE4490
- 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)
- 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
- LED Current:
- Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
Each with 8-Bit Current Resolution
- Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
- Low Power:
- 100 µA + Average LED Current
- LED On-Time Programmability from
(50 µs + Settle Time) to 4 ms - Independent LED2, LED1 Current Reference
- Receive Channel with High Dynamic Range:
- Input-Referred Noise:
50 pARMS (at 5-µA PD Current) - 13.5 Noise-Free Bits (at 5-µA PD Current)
- Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
- Low Power: < 2.3 mW at 3.0-V Supply
- Rx Sample Time: 50 µs to 4 ms
- I-V Amplifier with Seven Separate LED2 and LED1 Programmable Feedback R and C Settings
- Integrated Digital Ambient Estimation and Subtraction
- Input-Referred Noise:
- Integrated Fault Diagnostics:
- Photodiode and LED Open and
Short Detection - Cable On or Off Detection
- Photodiode and LED Open and
- Supplies:
- Rx = 2.0 V to 3.6 V
- Tx = 3.0 V or 5.25 V
- Package: Compact VQFN-40 (6 mm × 6 mm)
- Specified Temperature Range: –40°C to 85°C
The AFE4490 is a fully-integrated analog front-end (AFE) that is ideally suited for pulse-oximeter applications. The device consists of a low-noise receiver channel with a 22-bit 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 device, 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 –40°C to 85°C.
Technical documentation
No results found. Please clear your search and try again.
View all 2 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | AFE4490 Integrated Analog Front-End for Pulse Oximeters datasheet (Rev. H) | PDF | HTML | 29 Oct 2014 |
| 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
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
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.