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See Technical Specifications

AFE4950YBGR +BOM

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

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

AFE4950YBGR
Datasheet:

AFE4950YBGR Datasheet (PDF)
Number Of Channels:

1
Voltage - Supply, Analog:

1.7V ~ 1.9V, 1.9V ~ 3.6V, 3V ~ 5.5V
Voltage - Supply, Digital:

1.7V ~ 1.9V, 1.9V ~ 3.6V, 3V ~ 5.5V
Mounting Type:

Surface Mount
EDA/CAD Models:

Request Free CAD Models for AFE4950YBGR

AFE4950YBGR General Description

The AFE4950YBGR is a versatile analog front-end (AFE) designed for synchronized acquisition of PPG and ECG signals. It is ideal for a range of applications, including optical bio-sensing for heart-rate monitoring and measurement of peripheral capillary oxygen saturation. With its support for 2- and 3-electrode ECG configurations and integrated Right leg drive (RLD) buffer, the AFE4950YBGR offers a comprehensive solution for ECG signal acquisition. Additionally, its ability to monitor impedance between electrode pairs makes it suitable for continuous, low-power monitoring applications

Key Features

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

Specifications

Category	Integrated Circuits (ICs)Data AcquisitionAnalog Front End (AFE)	Series	-
Number of Bits	-	Number of Channels	1
Voltage - Supply, Analog	1.7V ~ 1.9V, 1.9V ~ 3.6V, 3V ~ 5.5V	Voltage - Supply, Digital	1.7V ~ 1.9V, 1.9V ~ 3.6V, 3V ~ 5.5V
Mounting Type	Surface Mount	Applications	1-lead ECG, BP, Dry electrode ECG, HRV, Optical-HRM, SpO2, Vo2 max
Number of input channels	4	Resolution (Bits)	22
Number of LEDs	8	Interface type	I2C, SPI
Operating temperature range (°C)	-40 to 85	Rating	Catalog
feature-resolution		feature-minimum-single-supply-voltage-v
feature-maximum-single-supply-voltage-v		feature-maximum-dual-supply-voltage-v
feature-power-supply-type		feature-packaging	Tape and Reel
feature-minimum-dual-supply-voltage-v		feature-rad-hard
feature-pin-count	36	feature-cecc-qualified
feature-esd-protection		feature-escc-qualified
feature-military	No	feature-aec-qualified	No
feature-aec-qualified-number		feature-auto-motive	No
feature-p-pap	No	feature-eccn-code	EAR99
feature-svhc		feature-svhc-exceeds-threshold	No