This ti validation design is applicable to electrocardiogram (ECG). ECG is a method of measuring cardiac electrical activity, which requires high-precision analog front-end instrument gain stage, filtering and high-resolution digital conversion. This design adopts a certain method to design a lead I ECG measurement system from multiple discrete analog components. Through an instrument front-end using opa2333, ultra-low power consumption is optimized and digitized by 18 bit ads8881.
18 bits, 10ksps sampling rate
200Hz ECG signal
Power: 1.5MW when avdd = 3.3V
Using ads8881 (18 bit, 1msps SAR ADC), opa2333 (input / INA), opa313 + ref3330 (Reference)
Schematic / block diagram