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AFE4490_14

更新时间： 2024-09-19 02:58:35
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德州仪器 - TI /
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Integrated Analog Front-End for Pulse Oximeters

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AFE4490_14 数据手册

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AFE4400  
www.ti.com  
SBAS601D –DECEMBER 2012–REVISED MAY 2013  
Integrated Analog Front-End for  
Heart Rate Monitors and Low-Cost Pulse Oximeters  
Check for Samples: AFE4400  
1
FEATURES  
APPLICATIONS  
23  
•
Fully-Integrated Analog Front-End for  
Pulse Oximeter Applications:  
•
•
•
Low-Cost Medical Pulse Oximeter Applications  
Optical HRM  
–
Flexible Pulse Sequencing and  
Timing Control  
Industrial Photometry Applications  
•
Transmit:  
DESCRIPTION  
The AFE4400 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 an integrated analog-to-digital  
converter (ADC), an LED transmit section, and  
diagnostics for sensor and LED fault detection. The  
AFE4400 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.  
–
Integrated LED Driver  
(H-Bridge or Push/Pull)  
95-dB Dynamic Range  
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  
•
Receive Channel with High Dynamic Range:  
The AFE4400 is a complete AFE solution packaged  
in a single, compact QFN-40 package (6 mm ×  
–
–
–
–
13 Noise-Free Bits (0.1 Hz to 5 Hz)  
Low Power: < 670 µA at 3.3-V Supply  
Flexible Receive Sample Time  
6
mm) and is specified over the operating  
temperature range of 0°C to +70°C.  
Supply  
(2.2 V to 3.6 V)  
Flexible Transimpedance Amplifier with  
Programmable LED Settings  
AFE4400  
–
Integrated Digital Ambient Estimation and  
Subtraction  
RX  
RED  
Amb (RED)  
AFE  
SPI  
SPI Interface  
TIA  
ûꢀ ADC  
IR  
•
•
Integrated Fault Diagnostics:  
Amb (IR)  
Photodiode  
–
Photodiode and LED Open and  
Short Detection  
Diagnostic  
PD Open or Short  
Timing  
Controller  
Cable Off  
–
Cable On/Off Detection  
LED Open or Short  
Supplies:  
–
–
Rx = 2.0 V to 3.6 V  
Tx = 3.0 V to 3.6 V  
LED  
Current  
Control  
DAC  
LED  
Driver  
LED  
•
•
Package: Compact QFN-40 (6 mm × 6 mm)  
Specified Temperature Range: 0°C to +70°C  
Tx  
OSC  
AFE  
Tx Driver  
Supply  
5-V Supply  
32 kHz  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
SPI is a trademark of Motorola.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2012–2013, Texas Instruments Incorporated  
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