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ams OSRAM AS7058 Integrated Analog Front Ends (AFEs) are multi-vital sign monitoring devices that provide a complete photoplethysmogram (PPG), electrocardiogram (ECG), body impedance (BioZ), and electrodermal activity (EDA). PPG measures the pulse rate or blood oxygen by sampling light modulated by the blood vessels that expand and contract as blood pulses. The ECG is the reference for any measurement of the biopotential generated by the heart. With EDA, it is possible to measure the skin’s water content, and with BioZ, body composition with an electrical system.
The PPG acquisition system provides up to eight LEDs and eight photodiode inputs. Two high-current 8-bit programmable LED drivers with four current ranges power the LEDs. Additionally, a unique laser safety support system can be enabled, which allows the use of a VCSEL die as a light source. The photodiodes can be read out synchronously with two 20-bit ADCs. The AS7058 includes an ambient light suppression method called advanced automatic offset control (AAOC). This method enables the system to adjust to ambient light before measurement starts. It minimizes data loss due to the saturation influence of ambient light.
The ECG channel features high input impedance, programmable gain, low noise, high CMRR, an anti-aliasing low-pass filter, and a high-resolution 20-bit ADC. It is designed per IEC 60601-2-47 Ambulatory ECG Systems monitoring compliance requirements.
The BioZ channel has a low-pass filter and a calibration routine available. The channel also offers high input impedance, low noise, programmable gain, low-/high-pass filter options, and shares the high-resolution ADC with the ECG system. Several ranges of excitation currents and frequencies are also available.
The ams OSRAM AS7058 provides DC and AC lead-off detection for the ECG, a flexible clock system, and a PLL. The three inbuilt ADCs are synchronized. The devices are available in a 42-ball wafer-level chip scale package (WLCSP) measuring 2.82mm x 2.55mm and operate over a -40°C to +85°C temperature range.
