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AFE4404 Datasheet

Ultra-Small Integrated AFE

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AFE4404
SBAS689D – JUNE 2015 – REVISED DECEMBER 2016
AFE4404 Ultra-Small, Integrated AFE for
Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing
1 Features
1 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
• 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
2 Applications
• Optical Heart-Rate Monitoring (HRM)
• Heart-Rate Variability (HRV)
• Pulse Oximetry (SpO2 Measurement)
• VO2 Max
• Calorie Expenditure
3 Description
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.
Device Information(1)
PART NUMBER PACKAGE
AFE4404
DSBGA (15)
BODY SIZE (NOM)
2.60 mm × 1.60 mm(2)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) Refers to dimensions D × E in Figure 99.
Offset
Cancellation
DAC
INP
INM
Simplified Block Diagram
TX_SUP
RX_SUP TX_SUP
TX1
TX2
TX3
LDO
I-V Amplifier (TIA)
Cf
ILED
LED
Driver
Rf Buffer
Noise-
Reduction
Filter
ADC
I2C Interface
Rf
IO
Buffer
IO_SUP
I2C_CLK
I2C_DAT
RESETZ
CLK
Cf
Internal,
External
Clock
GND
Timing
Engine
ADC_RDY
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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AFE4404 Datasheet Preview

AFE4404 Datasheet

Ultra-Small Integrated AFE

No Preview Available !

AFE4404
SBAS689D – JUNE 2015 – REVISED DECEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 4
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 7
7.6 Timing Requirements ............................................... 8
7.7 Typical Characteristics .............................................. 9
8 Detailed Description ............................................ 13
8.1 Overview ................................................................. 13
8.2 Functional Block Diagram ....................................... 13
8.3 Feature Description................................................. 14
8.4 Device Functional Modes........................................ 29
8.5 Register Map........................................................... 33
9 Application and Implementation ........................ 68
9.1 Application Information............................................ 68
9.2 Typical Application .................................................. 68
10 Power Supply Recommendations ..................... 75
11 Layout................................................................... 77
11.1 Layout Guidelines ................................................. 77
11.2 Layout Example .................................................... 77
12 Device and Documentation Support ................. 78
12.1 Receiving Notification of Documentation Updates 78
12.2 Community Resources.......................................... 78
12.3 Trademarks ........................................................... 78
12.4 Electrostatic Discharge Caution ............................ 78
12.5 Glossary ................................................................ 78
13 Mechanical, Packaging, and Orderable
Information ........................................................... 78
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (May 2016) to Revision D
Page
• Changed last sub-bullet of Receiver Features bullet ............................................................................................................. 1
• Changed test conditions of dynamic power-down mode rows in Current Consumption subsection of Electrical
Characteristics table ............................................................................................................................................................... 8
Changes from Revision B (October 2015) to Revision C
Page
• Changed specifications of t1 and t4 rows in Table 7 to improve rejection of ambient light................................................... 24
• Changed Description column in Table 10 ........................................................................................................................... 26
• Changed Table 11 ................................................................................................................................................................ 27
• Changed Table 12 ................................................................................................................................................................ 28
• Added Reducing Sensitivity to Ambient Light Modulation section........................................................................................ 70
Changes from Revision A (August 2015) to Revision B
Page
• Changed TX_SUP pin number to E3 in Pin Functions table ................................................................................................. 5
• Added Figure 9 ..................................................................................................................................................................... 10
• Added Decimation Mode section ......................................................................................................................................... 32
• Added rows 3Dh, 3Fh, and 40h to Table 16 ........................................................................................................................ 35
• Added Register 3Dh description to Register Map section.................................................................................................... 66
• Added Register 3Fh and Register 40h descriptions to Register Map section...................................................................... 67
• Added System-Level ESD Considerations section ............................................................................................................. 69
• Added input-referred current paragraph associated to Figure 9 in Application Curves section........................................... 72
2 Submit Documentation Feedback
Product Folder Links: AFE4404
Copyright © 2015–2016, Texas Instruments Incorporated


Part Number AFE4404
Description Ultra-Small Integrated AFE
Maker etcTI
Total Page 30 Pages
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