max30102替代方案之AFE4404
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R
f
C
f
R
f
C
f
Buffer
I-V Amplifier (TIA)
Offset
Cancellation
DAC
I
2
C Interface
INP
INM
LED
Driver
ILED
TX_SUP
TX3TX2TX1
LDO
RX_SUP
I2C_CLK
I2C_DAT
RESETZ
ADC_RDY
IO_SUP
CLK
Timing
Engine
IO
Buffer
GND
TX_SUP
Noise-
Reduction
Filter
Internal,
External
Clock
ADC
Copyright © 2016, Texas Instruments Incorporated
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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.
AFE4404
SBAS689D –JUNE 2015–REVISED DECEMBER 2016
AFE4404 Ultra-Small, Integrated AFE for
Wearable, Optical, Heart-Rate Monitoring and Bio-Sensing
1
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
• I
2
C 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 I
2
C 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 BODY SIZE (NOM)
AFE4404 DSBGA (15) 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.
Simplified Block Diagram
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