The 24-bit analog-to-digital converter GX1294, comparable to the ADS1294, is applied in smart wristbands

The smart bracelet market is rapidly expanding, with increasingly diverse product features. The addition of heart rate monitoring enables real-time health tracking for users, while NFC payment functionality provides convenience for daily transactions. These advancements have transformed smart bracelets from mere health monitoring devices into versatile tools that integrate seamlessly into various aspects of people‘s lives.

Nowadays, smart wristbands have evolved into comprehensive health management tools, with newly added functions such as blood pressure monitoring, blood oxygen saturation monitoring, and respiratory training, enabling users to gain a more holistic understanding of their physical condition. In particular, health monitoring demands extremely high accuracy and stability in data. The analog-to-digital converter GX1294 provides critical technical support for the health monitoring functions of smart wristbands.

The GX1294 is a 24-bit Δ-Σ analog-to-digital converter featuring four-channel synchronous sampling, an integrated programmable gain amplifier (PGA), internal reference, and built-in oscillator. Designed for ECG applications, the GX1294 includes functions such as right leg drive, lead disconnect detection, pacemaker detection, and WCT. It can switch to internal clock and internal reference, thereby simplifying ECG peripheral circuits and significantly reducing the size, power consumption, and cost of the application product.

The GX1294 can perform Offset testing, temperature monitoring, power measurement, and channel testing by configuring a multiplexer to select signals connected to the ADC main channel, enabling more convenient monitoring of the environmental configuration of the GX1294 and the operating conditions of the product. Additionally, the GX1294 can be configured with a multiplexer to select the common-mode level of any input channel to generate a Right Leg Drive (RLD) signal, featuring pull-up/pull-down resistors, excitation current sinks/sources, and AC lead detection capabilities.

The GX1294 features a built-in pacemaker amplifier, enabling pacemaker detection in conjunction with peripheral circuits. On the software side, this series boasts a data rate of up to 32kSPS, supporting software-based pacemaker detection. Additionally, it integrates the Wilson Central Terminal (WCT) and Goldberger Central Terminal (GCT) required for 12-lead ECG. The series also fully incorporates respiratory impedance measurement functionality.