Texas Instruments | AFE4420 Ultra-Small, Integrated AFE With FIFO for Multi-sensor Wearable, Optical Heart-rate Monitoring and Bio-sensing (Rev. A) | Datasheet | Texas Instruments AFE4420 Ultra-Small, Integrated AFE With FIFO for Multi-sensor Wearable, Optical Heart-rate Monitoring and Bio-sensing (Rev. A) Datasheet

Texas Instruments AFE4420 Ultra-Small, Integrated AFE With FIFO for Multi-sensor Wearable, Optical Heart-rate Monitoring and Bio-sensing (Rev. A) Datasheet
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AFE4420
SBAS910A – JUNE 2018 – REVISED JULY 2019
AFE4420 Ultra-Small, Integrated AFE With FIFO for Multi-sensor Wearable,
Optical Heart-rate Monitoring and Bio-sensing
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1
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Supports signal acquisition of up to 16 phases
Flexible allocation of LEDs and PDs in each
phase
Accurate, continuous heart-rate monitoring:
– Up to 100-dB dynamic range
– Low current for continuous operation on a
wearable device with a typical value
– 15 μA for an LED, 20 μA for the receiver
Transmitter:
– Supports common anode LED configuration
– 8-Bit programmable LED current with range
adjustable from 50 mA to 200 mA
– Mode to fire two LEDs in parallel
– Programmable LED on-time
– Simultaneous support of 4 LEDs for optimized
SpO2, HRM, or multi-wavelength HRM
– Programmable control signals to extend
operation to 8 LEDs using external SPDT
switches
Receiver:
– Supports 4 time-multiplexed photodiode inputs
– Individual DC offset subtraction DAC at TIA
input for each LED, ambient with 7-bit control
and range up to ±254 µA
– Transimpedance gain: 10 kΩ to 2 MΩ
– Digital ambient subtraction at ADC output to
suppress ambient tones
– Noise filtering with programmable bandwidth
Supports external clock and internal oscillator
modes
Automatic ambient cancellation mode (AACM) to
increase receiver dynamic range
Two programmable GPIO pins with flexible
interrupt generation
FIFO with 128-sample depth
I2C, SPI interfaces: selectable by pin
Operating temperature range: –40°C to +85°C
2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch
•
Supplies:
– Rx:
– 1.7 V to 1.9 V (LDO bypass)
– 1.9 V to 3.6 V (LDO enabled)
– Tx: 3 V to 5.5 V
– IO: 1.7 V to RX_SUP
2 Applications
•
Optical heart-rate monitoring (HRM) for
wearables, hearables
Heart-rate variability (HRV)
Pulse oximetry (SpO2) measurements
Maximum oxygen consumption (VO2 Max)
Calorie expenditure
•
•
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3 Description
The AFE4420 is an analog front-end for optical biosensing applications, such as heart-rate monitoring
(HRM) and saturation of peripheral capillary oxygen
(SpO2). The device supports up to four switching
light-emitting diodes (LEDs) and up to four
photodiodes. Up to 16 signal phases can be defined
and the signal can be acquired from each phase in a
synchronized manner and stored in a 128-sample
First in, First out (FIFO) block. The FIFO can be read
out using either an I2C or a SPI interface. The AFE
also has a fully integrated LED driver with an 8-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
AFE4420
BODY SIZE (NOM)
DSBGA (30)
2.60 mm × 2.10 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
TX_SUP
LED1
IO_SUP
RX_SUP
CONTROL1
LED2
LED3
LED4
TX_SUP
TX1
1.8 V LDOs
TX2
TX3
TX4
ALDO_1V8, DLDO_1V8
INP1
PD1
CF
INM1
ILED
INP2
PD2
INM2
INP3
PD3
INPUT MUX
1 Features
Offset
DAC
TIA
RF
THR_DET_RDY
Threshold
Detection
RF
Noise
reduction
filter (x4)
ADC
FIFO
I2C_SPI_SEL
SPI/
I2C Interface
SPI
I2C
RESETZ
INM3
INP4
CF
PD4
INM4
Automatic
Ambient
Cancellation
4 MHz
Oscillator
ADC_RDY
GPIO1
GPIO2
Timing Engine
128 kHz
Oscillator
CLK
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.
AFE4420
SBAS910A – JUNE 2018 – REVISED JULY 2019
www.ti.com
Table of Contents
1
2
3
4
5
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Device and Documentation Support....................
1
1
1
2
3
5.1 Receiving Notification of Documentation Updates.... 3
5.2
5.3
5.4
5.5
6
Community Resources..............................................
Trademarks ...............................................................
Electrostatic Discharge Caution ................................
Glossary ....................................................................
3
3
3
3
Mechanical, Packaging, and Orderable
Information ............................................................. 3
4 Revision History
Changes from Original (June 2018) to Revision A
•
2
Page
Changed the Mechanical Packaging images ......................................................................................................................... 4
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: AFE4420
AFE4420
www.ti.com
SBAS910A – JUNE 2018 – REVISED JULY 2019
5 Device and Documentation Support
5.1 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
5.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
5.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
5.4 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
5.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
6 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: AFE4420
3
AFE4420
SBAS910A – JUNE 2018 – REVISED JULY 2019
www.ti.com
PACKAGE OUTLINE
YZ0030-C01
DSBGA - 0.5 mm max height
SCALE 5.000
DIE SIZE BALL GRID ARRAY
2.095
2.035
B
A
BALL A1
CORNER
2.595
2.535
0.5 MAX
C
SEATING PLANE
BALL TYP
0.19
0.13
0.05 C
1.6
TYP
0.85
F
E
2
TYP
D
0.4
TYP
SYMM
C
B
A
30X
0.015
0.25
0.21
C A B
1
2
3
4
5
PKG
0.4 TYP
4222550/D 07/2019
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
www.ti.com
4
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Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: AFE4420
AFE4420
www.ti.com
SBAS910A – JUNE 2018 – REVISED JULY 2019
EXAMPLE BOARD LAYOUT
YZ0030-C01
DSBGA - 0.5 mm max height
DIE SIZE BALL GRID ARRAY
(0.85)
(0.4) TYP
30X (
0.23)
1
3
2
4
5
A
(0.4) TYP
B
C
PKG SYMM
D
E
F
PKG
LAND PATTERN EXAMPLE
SCALE:30X
( 0.23)
METAL
0.05 MAX
METAL UNDER
SOLDER MASK
0.05 MIN
( 0.23)
SOLDER MASK
OPENING
SOLDER MASK
OPENING
NON-SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK
DEFINED
SOLDER MASK DETAILS
NOT TO SCALE
4222550/D 07/2019
NOTES: (continued)
3. Final dimensions may vary due to manufacturing tolerance considerations and also routing constraints.
See Texas Instruments Literature No. SNVA009 (www.ti.com/lit/snva009).
www.ti.com
Submit Documentation Feedback
Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: AFE4420
5
AFE4420
SBAS910A – JUNE 2018 – REVISED JULY 2019
www.ti.com
EXAMPLE STENCIL DESIGN
YZ0030-C01
DSBGA - 0.5 mm max height
DIE SIZE BALL GRID ARRAY
(0.85)
(0.4) TYP
30X ( 0.25)
(R0.05) TYP
1
2
4
3
5
A
(0.4) TYP
B
METAL
TYP
C
PKG SYMM
D
E
F
PKG
SOLDER PASTE EXAMPLE
BASED ON 0.1 mm THICK STENCIL
SCALE:35X
4222550/D 07/2019
NOTES: (continued)
4. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release.
www.ti.com
6
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Copyright © 2018–2019, Texas Instruments Incorporated
Product Folder Links: AFE4420
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jul-2019
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
AFE4420YZR
ACTIVE
DSBGA
YZ
30
3000
Green (RoHS
& no Sb/Br)
SAC396
Level-1-260C-UNLIM
-40 to 85
AFE4420
AFE4420YZT
ACTIVE
DSBGA
YZ
30
250
Green (RoHS
& no Sb/Br)
SAC396
Level-1-260C-UNLIM
-40 to 85
AFE4420
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jul-2019
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Aug-2019
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
AFE4420YZR
DSBGA
YZ
30
3000
178.0
9.2
AFE4420YZT
DSBGA
YZ
30
250
178.0
9.2
Pack Materials-Page 1
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
2.27
2.72
0.78
4.0
8.0
Q1
2.27
2.72
0.78
4.0
8.0
Q1
PACKAGE MATERIALS INFORMATION
www.ti.com
8-Aug-2019
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
AFE4420YZR
DSBGA
YZ
30
3000
220.0
220.0
35.0
AFE4420YZT
DSBGA
YZ
30
250
220.0
220.0
35.0
Pack Materials-Page 2
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