Analog-to-digital conversion circuit principle in blood pressure measurement

We use the high-performance 7/2-bit A/D converter device MC14433 from Motorola, which has an oscillator on the chip, as long as it has two external capacitors and two resistors, the output range is 199.9 mV.

In the output signal end of MC14433, Q0~Q3 are the BCD code data output terminals, and DS1~DS4 are the output strobe signals of thousands, hundreds, ten and single digits respectively. By adjusting the resistance of the resistor R, the output BCD code of the MC14433 can be made the same as the input voltage. The MC1403 is a precision power supply that provides a reliable reference voltage for the MC14433.

Blood pressure analog-to-digital conversion circuit schematic

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