ams AS7057 Medical and Health Sensor - Analog Frontend



The AS7057 Biosignal Sensor Analog Frontend (AFE) is the next generation Vital Sign Sensor. It enables the user to detect biosignals such as photoplethysmogram (PPG) and pulse transit time (PTT), as well as proximity. PPG is the most used HRM method. It measures the pulse rate - by sampling light modulated by the blood vessels, which expand and contract as blood pulses through them. Apart from HRM/HRV, optical Blood Pressure and SpO2 are also enabled by the two independent working photodiode inputs of the AS7057. The AS7057 is a size and performance optimized analog frontend to support space-limited applications such as in-ear vital sign monitoring.
The AS7057 provides three LED driver outputs, samples up to three photodiode inputs, and supports proximity detection integrated into one of the PPG signal channels. This enables high flexibility for several LED and photodiode arrangements in different applications. Furthermore, the AS7057 Biosignal Sensor Analog Frontend provides two ADC channels for simultaneous PPG measurements and an automatic photodiode offset control.
The AS7057’s low-power design and small form factor are particularly well-suited for application in earbuds, fitness bands, smartwatches, sports watches, and smart patches. In these cases, board space is limited, and users look for extended, multi-day intervals between battery recharges. A thin package dimension makes the AS7057 suitable for height-constrained solutions like earbuds.



  • 3 LED drivers and 3 photodiode input pins
  • Smallest wafer level chip scale package on the market
  • Two synchronized PPG acquisition channels
  • Two independent, programmable sequence blocks inside PPG signal acquisition
  • Several power reducing functionalities


  • Flexible system design possible
  • Small size application possible, eg hearables
  • Enables optical blood pressure measurement
  • Enables proximity detection for additional energy savings
  • Prolonging the operating time


Supply Voltage [V]
1.7 -1.98
Supported Algorithms
Temperature Range [°C]
-30 to 85°C
I²C Bus
I²C slave, fast mode plus (1 MHz), fast mode (400 kHz) and standard mode (100 kHz)
LED Configuration


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AS7057 Biosignal Converting Unit


AS7057 DS001053

Short datasheet