General Description
The operation of the AS7038RB is based on photoplethysmography (PPG) and electrocardiogram
(ECG). PPG is the most used HRM method, which measures the pulse rate by sampling light
modulated by the blood vessels, which expand and contract as blood pulses through them. PPG is
also used to measure the blood oxygen saturation (SpO2). ECG is the reference for any measurement
of the bio potential generated by the heart.
Embedded ECG analog front end satisfies IEC 60601-2-47 requirements.
The solution includes LED drivers, photo-sensor, analog front-end (AFE) and sequencer as well as
application software. In addition, the device also enables skin temperature and skin resistivity
measurements by providing interfaces to external sensors.
Compare to ams previous generation AS7038RB has 250% larger photodiode with lower LEDs driving
current to achieve the high PPG performances.
The AS7038RB’s low-power design and small form factor is particularly well suited to application in
earbuds, fitness bands, smart watches, sports watches and smart patches, in which board space is
limited and in which users look for extended, multi-day intervals between battery recharges. Thin
package dimension makes the AS7038RB suitable for height constrained solution likes earbuds or
smart patches. Photodiode filter centered on red and infra-red wavelengths and embedded ADC make
the AS7038RB suitable for disposable Pulse Oximeter solution.
Applications
Optical sensor platform
Disposable oximeter
Smart patch
Earbuds
Fitness band
Smart watch
Oximeter
ECG monitoring