SBASAC6
April 2021
AFE4500
PRODUCTION DATA
1
Features
2
Applications
3
Description
4
Description (continued)
5
Revision History
6
Device and Documentation Support
6.1
Documentation Support
6.1.1
Related Documentation
6.2
Receiving Notification of Documentation Updates
6.3
Support Resources
6.4
Trademarks
6.5
Electrostatic Discharge Caution
6.6
Glossary
7
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
YBG|42
MXBG429
Thermal pad, mechanical data (Package|Pins)
Orderable Information
sbasac6_oa
sbasac6_pm
1
Features
Integrated signal chains for Bio-Z, EDA, ECG, PPG
Synchronized ECG, PPG enables PTT-based BP
Bio-Z signal chain
Multi-frequency Body impedance Analysis (BIA) with frequency programmable up to 250 kHz
Low frequency excitation mode for EDA/GSR
Complex (I,Q) Tetrapolar impedance measurement
Sine-wave excitation with a 7-bit DAC
Calibration scheme compensates for electrode impedance to achieve accurate Bio-Z
State machine for Automatic Calibration
ECG signal chain:
1-lead ECG signal acquisition up to 2 kHz
INA gain programmable from 2-21
RLD output to set body bias through third electrode
Input noise (0.5-150 Hz): 0.75 µVrms at 1 kHz
± 0.6 V differential DC offset and ± 0.3 V CM range
HPF with 0.4 Hz corner, quick saturation recovery
>1 GΩ input impedance, CMRR > 100 dB
Integrated 300 Hz anti-aliasing low pass filter
AC, DC lead-off detect: 1.6-nA to 100-nA
PPG signal chain
Supports acquisition of up to 24 PPG signals
Flexible allocation of 8 LED, 4 PD in each phase
Supports PPG sensors at different data rates
Optical loopback SNR of 100-dB, extendable to 110-dB with on-chip filtering
Low Current for Continuous Operation with a Typical Value: 15-μA for an LED, 15-μA for the Receiver
PPG Transmitter
8-Bit Programmable LED Current with range adjustable from 25 mA to 250 mA
Programmable LED On-Time per-phase
Support of 8 LEDs in Common Anode
PPG Receiver
Supports 4 PDs, 2 parallel receive paths
Noise filtering with programmable bandwidth
Trans-impedance Gain: 3.7 kΩ to 1 MΩ
8-bit Ambient Offset Subtraction DAC with range from16-256 µA
8-bit LED Offset Subtraction DAC with range from 32 to 64 µA
Automatic ambient & LED DC cancellation
Supports external clock and internal oscillator modes
FIFO with 256-sample Depth
SPI
TM
, I
2
C interfaces: Selectable by pin
Supplies: Rx:1.7-1.9V (LDO Bypass); 1.9 V to -3.6 V (LDO Enabled), Tx: 3 V to 5.5 V, IO:1.7-RX_SUP