The electrocardiogram (ECG), which measures electrical signals produced by the heart, has benefited greatly from technological advances. These technological evolutions have resulted in less invasive, more accurate medical procedures and diagnostics and improved patient experiences.
Whereas medical analog front ends (AFEs) were once implemented using discrete components, technological advances enabled manufacturers to integrate most of these components into a single device, making designs simpler and quicker to complete. One of the biggest challenges to designing high-quality ECG systems is acquiring quick and accurate measurements. Portable ECG equipment in consumer and ambulatory applications requires minimal solution size and power consumption, adding to the challenge.
The main function of an AFE is to take electrical signals from the real world and digitize them. However, ECG measurements require several key features that are often designed discretely. Devices that provide a highly integrated solution for a medical AFE include several commonly used features for biopotential measurements. In addition, the architecture of delta-sigma analog-to-digital converters (ADCs) use oversampling and noise shaping to offer high signal-to-noise ratio (SNR), which enable measurements of the smallest of ECG signals. The performance specifications of these devices enable you to design system solutions that can help satisfy International Electrotechnical Commission (IEC) and Association for the Advancement of Medical Instrumentation (AAMI) requirements for medical end equipment.
The ADS1298 family, for example integrates several components with the ADC itself, including a reference voltage, a master clock oscillator and programmable gain amplifier. In addition, these devices incorporate many features that are important when designing ECG systems, including:
With high levels of integration and features and exceptional device performance, the ADS1298 device family accelerates the development of precision ECG equipment. Just as the ADS1298 family fits into ECG devices, they also fit into many other types of medical equipment, such as electromyographs (EMGs) and fitness wearables. In future blog posts, I’ll delve into how the high level of integration and device performance of the ADS1298 family enables many other different biopotential measurement applications. To get posts like this delivered to your inbox, sign in and subscribe to Analog Wire.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.