Home Data converters Integrated/special function data converters Medical AFEs Biosensing AFEs
Home
Data converters
Integrated/special function data converters
Medical AFEs
Biosensing AFEs

AFE4950

ACTIVE

Ultra-small integrated AFE for wearable optical heart-rate monitoring and SpO2

Order now
Data sheet

AFE4950

ACTIVE
Data sheet Order now

Product details

Applications Optical-HRM, Dry electrode ECG, 1-lead ECG, BP, HRV, SpO2, Vo2 max Number of input channels 4 Resolution (Bits) 24 Number of LEDs 8 Interface type I2C, SPI Operating temperature range (C) -40 to 85 Rating Catalog
Applications Optical-HRM, Dry electrode ECG, 1-lead ECG, BP, HRV, SpO2, Vo2 max Number of input channels 4 Resolution (Bits) 24 Number of LEDs 8 Interface type I2C, SPI Operating temperature range (C) -40 to 85 Rating Catalog
DSBGA (YBG) 36 —
  • Supports simultaneous and synchronized acquisition of up to 24 PPG and a single-lead ECG signal.
  • Flexible allocation of 8 LED, 4 PD in each phase
  • ECG signal chain:
    • 1-lead ECG signal acquisition up to 2 kHz
    • RLD output to drive a third electrode
    • Input noise : 0.7 µV-rms
    • Supports up to ±0.65 V differential DC offset and +/-0.55 V common mode range
    • Programmable INA gain: 11, 21
    • High-pass filter with quick saturation recovery
    • Integrated 300 Hz anti-aliasing low pass filter
    • AC, DC lead-off detect: 2.9 nA to 92.5 nA
    • Low power continuous lead-on detection
  • Impedance signal chain
    • Continuous low-power monitoring of impedance between 2 electrodes
    • 7 MΩ range
    • 300 Ω noise on 620 kΩ
  • PPG Transmitter:
    • 8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel
    • Support of 8 LEDs in Common Anode configuration for SpO2, Multi-Wavelength HRM
  • PPG Receiver:
    • 2 parallel receivers (two sets of TIA/ filter)
    • Supports 4 Time-Multiplexed Photodiode Inputs to each Receiver
    • 8-bit Ambient Offset subtraction at each TIA input with 256 µA range
    • 8-bit LED Offset Subtraction DAC with 64 µA range
    • Automatic ambient cancellation and dynamic LED DC cancellation at TIA input
    • Ambient rejection close to 100 dB up to 10 Hz
    • Noise filtering with programmable bandwidth
    • Trans-impedance Gain: 3.7 kΩ to 1 MΩ
  • Accurate, Continuous Heart-Rate Monitoring:
    • System SNR up to 109-dB at 16 µA PD current
    • Low Current for Continuous Operation on a Wearable Device with a Typical Value: 15-µA for an LED, 20-µA for the Receiver
  • External clock and internal oscillator modes
  • Acquire data synchronized with system master clock
  • FIFO with 256-sample Depth
  • SPI, I2C interfaces: Selectable by pin
  • 2.6-mm × 2.5-mm DSBGA, 0.4-mm Pitch
  • Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9-3.6V (LDO Enabled), Tx:3-5.5V, IO:1.7-RX_SUP
  • Supports simultaneous and synchronized acquisition of up to 24 PPG and a single-lead ECG signal.
  • Flexible allocation of 8 LED, 4 PD in each phase
  • ECG signal chain:
    • 1-lead ECG signal acquisition up to 2 kHz
    • RLD output to drive a third electrode
    • Input noise : 0.7 µV-rms
    • Supports up to ±0.65 V differential DC offset and +/-0.55 V common mode range
    • Programmable INA gain: 11, 21
    • High-pass filter with quick saturation recovery
    • Integrated 300 Hz anti-aliasing low pass filter
    • AC, DC lead-off detect: 2.9 nA to 92.5 nA
    • Low power continuous lead-on detection
  • Impedance signal chain
    • Continuous low-power monitoring of impedance between 2 electrodes
    • 7 MΩ range
    • 300 Ω noise on 620 kΩ
  • PPG Transmitter:
    • 8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
    • Mode to fire two LEDs in parallel
    • Support of 8 LEDs in Common Anode configuration for SpO2, Multi-Wavelength HRM
  • PPG Receiver:
    • 2 parallel receivers (two sets of TIA/ filter)
    • Supports 4 Time-Multiplexed Photodiode Inputs to each Receiver
    • 8-bit Ambient Offset subtraction at each TIA input with 256 µA range
    • 8-bit LED Offset Subtraction DAC with 64 µA range
    • Automatic ambient cancellation and dynamic LED DC cancellation at TIA input
    • Ambient rejection close to 100 dB up to 10 Hz
    • Noise filtering with programmable bandwidth
    • Trans-impedance Gain: 3.7 kΩ to 1 MΩ
  • Accurate, Continuous Heart-Rate Monitoring:
    • System SNR up to 109-dB at 16 µA PD current
    • Low Current for Continuous Operation on a Wearable Device with a Typical Value: 15-µA for an LED, 20-µA for the Receiver
  • External clock and internal oscillator modes
  • Acquire data synchronized with system master clock
  • FIFO with 256-sample Depth
  • SPI, I2C interfaces: Selectable by pin
  • 2.6-mm × 2.5-mm DSBGA, 0.4-mm Pitch
  • Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9-3.6V (LDO Enabled), Tx:3-5.5V, IO:1.7-RX_SUP

The AFE4950 device is an analog front-end (AFE) for synchronized signal acquisition of PPG and ECG signals. The device can also be used for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The ECG signal chain supports 2- and 3-electrode configurations and has an integrated Right leg drive (RLD) buffer. The ECG signal chain can also be used to do a continuous, low-power monitoring of the impedance between pair of electrodes.

The AFE4950 device is an analog front-end (AFE) for synchronized signal acquisition of PPG and ECG signals. The device can also be used for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The ECG signal chain supports 2- and 3-electrode configurations and has an integrated Right leg drive (RLD) buffer. The ECG signal chain can also be used to do a continuous, low-power monitoring of the impedance between pair of electrodes.
open-in-new Find other Biosensing AFEs
Download
Information

Request more information

Full data sheet and other design resources are available under NDA. Request now

Similar products you might be interested in

open-in-new Compare products
Same functionality with different pin-out to the compared device.
AFE49I30 ACTIVE Ultra-low-power integrated AFE for wearable optical biosensing with FIFO, I2C and ECG Six LEDs with 600-Hz LPF

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 9
Type Title Date
* Data sheet AFE4950 Ultra-Small, Integrated AFE for Wearable Optical Heart-Rate Monitoring, SpO2 and Electrical Bio-sensing datasheet (Rev. B) PDF | HTML 15 Jul 2021
Application note ECG Signal Acquisition on Wearables PDF | HTML 15 Nov 2022
Application note Measuring Oxygen Saturation (SpO2) on Wearables PDF | HTML 14 Nov 2022
Application note Optical Heart Rate Monitoring (OHRM) on Wearables PDF | HTML 14 Nov 2022
Application note Cuffless Blood Pressure Monitoring on Wearables PDF | HTML 09 Nov 2022
Technical article Solving 5 challenges of ECG signal acquisition in wearables 21 Jul 2021
Technical article Offset correction improves the next generation of heart-rate smart watches 24 Aug 2015
Technical article A new way to illuminate the human condition 30 Dec 2013
Technical article Oximeter signaling: There’s more than meets the eye 04 Dec 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

AFE4950EVM — AFE4950 evaluation module for ultra-small integrated AFE for wearable optical heart-rate monitoring

The AFE4950 evaluation module (EVM) is designed to expedite evaluation and system-development activities related to the AFE4950 product. AFE4950 is an analog front end (AFE) for synchronized signal acquisition of PPG and ECG signals. AFE4950 can also be used for optical biosensing applications, (...)

Request
Driver or library

BSECUR-3P-ALGORITHMS — B SECUR ECG algorithms and electrode design services

HeartKey is a powerful and accurate set of ECG algorithms, ready for integration into the next generation low power low memory consumer / IoT & medical devices such as smartwatches, smart clothing, medical, automotive, smart home devices and hand-held devices. HeartKey is comprised of advanced (...)
From: B Secur
Go to third party
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Request
Package Pins Download
DSBGA (YBG) 36 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos