Nanochap BAF003 Analog Front-end in Portable Electrocardiograph, 2.4mm ultra-small size

PublishTime： 2023-11-23 Article Source：Nanochap News

Portable electrocardiographs have the following advantages over conventional electrocardiographs:

1. Portability: Portable electrocardiographs are small and lightweight and can be carried around, making them easy to use in different settings. There is no need to go to a specialized medical facility, and ECG monitoring can be done at home, in the office, or on the go.

2. Simple operation: Portable ECG devices usually have an easy-to-understand interface, making them more convenient to use. Simply place two fingers on the device and wait a few seconds for the test to be completed. Users can complete the operation on their own, without the need for professional help.

3. REAL-TIME MONITORING: The portable electrocardiograph can display the ECG in real-time and record the data. Users can immediately obtain the monitoring results of the heart state and detect abnormalities in time.

4. Remote monitoring: Portable ECG monitors usually support wireless connection, which can transmit monitoring data to doctors or professionals for remote monitoring and diagnosis. This is very convenient for some patients suffering from heart disease.

Fig.1

Overall, portable electrocardiographs have the advantages of portability, easy operation, real-time monitoring, high-definition electrocardiograms, and remote monitoring. Its appearance makes ECG monitoring more convenient and reliable and plays a positive role in the early detection and treatment of heart diseases.

Portable electrocardiograph due to the compact size, for the size of the internal components, have high requirements, and in the small volume at the same time need to take into account the problem of endurance, which puts forward high requirements for the chip.

Nine Senses BAF003 analog front-end is highly integrated in a CSP package with a volume of only 2.4mm, a standby current of less than 4μA, a PPG power consumption of 35μA, an ECG of 39μA, a sleep power consumption of less than 100nA, and a continuous sample power consumption of as low as 35μA, which provides a long endurance capability.

Fig.2 Typical application circuit of BAF003-25-3VECG acquisition

Nanochap Nine Senses BAF003 analog front-end advantages and features

●Supports 3V power supply applications

●Chip leakage less than 15nA in disable mode

●Ultra-low noise, high signal-to-noise ratio, two-stage programmable amplifier

●Acquisition circuit noise is less than 6μV

●Conversion accuracy of the effective number of bits to 16bit

Product parameters

●Supply voltage: 2.8V ~ 3.6V

●Package and size: WLCSP (2.4mm X 2.48mm), QFN36 (4 X 4mm)

●Op-amp bias voltage on-chip DAC (0.3V to 2V)

●Op-amp noise: 2.2μV (0.1~10Hz)

●On-chip TIA feedback resistor: 200K ~ 10M 16 steps

●ADC precision: 16bit

●Chip sleep power consumption: <100nA

●Standby current: <4μA

●Continuous sampling power consumption: <40μA

●Temperature sensor: 0.1℃ accuracy

Fig.3 Chip structure diagram

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