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AS7038RB

General Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 3

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.

1.1

Key Benefits & Features

The benefits and features of AS7038RB, Biosensor Solution with Embedded ECG Channel, are listed

below:

Figure 1:

Added Value of Using AS7038RB

Benefits

Features

Address all skin types

Improved optical path

Higher optical SNR

250% larger embedded photodiode

Allows smallest application size e.g. narrow

HRM measurement band

Compact device integrated PD and analog front

end

Electrocardiogram ECG with dry electrodes

Embedded low noise analog front end for ECG

signals acquisition fulfill IEC 60601-2-47

Enabling SpO2 measurements

RED and IR dedicated embedded PD filter

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