Design of a High-Precision Hemodynamic Module Based on the AD7124

School of Biological Science & Medical Engineering, Southeast University, Nanjing, China

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

This study presents the design and implementation of a high-precision, multi-channel hemodynamic acquisition module for synchronous invasive blood pressure monitoring. The system adopts a modular hardware architecture integrating differential signal conditioning, low-noise amplification, multi- level protection, a 24-bit Σ–Δ ADC (AD7124), and an STM32F205-based controller for data management and communication. Quasi-synchronous sampling of three pressure channels is achieved with independently configurable sampling rates and gains, while firmware based on STM32CubeHAL ensures accurate timing control and data framing. Experimental results from mock-loop testing demonstrate high static accuracy, reliable linearity, and preliminary bench-top verification of dynamic waveform acquisition capability and inter-channel skew within 10 μs. The proposed module features compact size, low power consumption, and scalable channel capability, and can be readily integrated into existing monitoring systems or experimental platforms, providing a stable and high-fidelity data acquisition front end for hemodynamic research and algorithm development.