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AFE4410
SBAS832B –MAY 2017–REVISED JULY 2019
AFE4410 Ultra-Small, Integrated AFE With FIFO for
Wearable, Continuous Optical Heart-Rate Monitoring and Biosensing
1 Features
2 Applications
1
•
Accurate, Continuous Heart-Rate Monitoring:
•
Optical Heart-Rate Monitoring (HRM) for
Wearables, Hearables
–
Up to 100-dB Dynamic Range for Accurate
Heart-Rate Detection
•
•
•
Heart-Rate Variability (HRV)
Pulse Oximetry (SpO2) Measurements
Maximum Oxygen Consumption (VO2 Max)
–
Low Current for Continuous Operation on a
Wearable Device With a Typical Value:
–
30 µA for an LED, 25 µA for the Receiver
3 Description
•
Transmitter:
TheAFE4410is an analog front-end for optical
biosensing applications, such as heart rate monitoring
(HRM). The device supports a maximum of four
–
–
–
–
–
4 LEDs in Common Anode Configurations
8-Bit Programmable LED Current to 200 mA
Mode to Fire Two LEDs in Parallel
Programmable LED On-Time
switching light-emitting diodes (LEDs) and
a
maximum of three photodiodes (PDs). The electrical
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 is stored in a 128-sample first-in, first-out block
(FIFO) with programmable depth. The FIFO can be
read out using either an I2C interface or a serial
peripheral interface (SPI). The AFE also has a fully
integrated LED driver with 8-bit current control. The
device has high dynamic range transmit-and-receive
circuitry offering a dynamic range of up to 100 dB that
enables accurate heart ratesensing. The AFE
achieves extremely low current levels by operating an
ultralow power (ULP) mode set by using the
ENABLE_ULP register bit.
Simultaneous Support of 3 LEDs for Optimized
SpO2, HRM, or Multiwavelength HRM
–
Average Current of 30 µA Adequate for a
Typical Heart-Rate Monitoring Scenario:
–
20-mA Setting, 60-µs Pulse Duration,
25-Hz Sampling Rate
•
Receiver:
–
–
Supports 3 Time-Multiplexed PD Inputs
24-Bit Representation of Current Input From
PD in Two's-Complement Format
–
Individual DC Offset Subtraction DAC
(Up to ±127-µA Range) at TIA Input for Each
LED, Ambient
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
–
–
–
–
Digital Ambient Subtraction at ADC Output
Transimpedance Gain: 10 kΩ to 2 MΩ
AFE4410
DSBGA (30)
2.60 mm × 2.10 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
Noise Filtering With Programmable Bandwidth
Receiver Operates at Approximately 1-µA/Hz
Sampling Rate (Example, 25 µA at 25 Hz)
Simplified Block Diagram
–
Hardware Power-Down Mode: Approximately
0-µA Current
TX_SUP
LED1
LED2
LED3
LED4
TX4
CONTROL1
RX_SUP
TX_SUP
IO_SUP
•
•
•
Flexible Pulse Sequencing and Timing Control
Clocking Via External Clock or Internal Oscillator
FIFO With 128-Sample Depth:
TX1
TX2
TX3
1.8 V LDOs
ALDO_1V8, DLDO_1V8
INP1
INM1
CF
RF
PD1
ILED
THR_DET_RDY
I2C_SPI_SEL
Threshold
Detection
Offset
DAC
Noise
reduction
filter (x4)
INP2
INM2
SPI/
I2C Interface
SPI
I2C
TIA
RF
Decimation
ADC
PD2
PD3
FIFO
–
Programmable Partitioning Across Phases
RESETZ
INP3
INM3
•
•
•
•
Pin-Selectable I2C, SPI Interface
Operating Temperature Range: –20°C to +70°C
2.6-mm × 2.1-mm, 0.4-mm Pitch DSBGA Package
Supplies:
4 MHz
Oscillator
ADC_RDY
PROG_OUT1
CF
Timing Engine
128 kHz
Oscillator
CLK
–
–
Tx: 3 V to 5.25 V
Rx: 1.8 V to 1.9 V (LDO Bypass),
2.0 V to 3.6 V (LDO Enabled)
–
IO: 1.7 V to Rx_SUP
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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