GX1298R is comparable to ADS1298R and is used in high-performance medical sensor solutions.

Medical sensors are sensors used in the biomedical field. They collect physiological information and then express it as electrical signals. Physiological information includes internal information (such as blood pressure and other types of pressure), external information (such as electrocardiograms and other types of bioelectricity), and external information (such as infrared and biomagnetic information).

Given the unique and complex nature of biological signals, and considering the biocompatibility, reliability, and safety requirements of biomedical sensors, the sensors must possess excellent technical performance characteristics, such as sensitivity, linearity, hysteresis, repeatability, frequency response range, signal-to-noise ratio, temperature drift, zero drift, and sensitivity drift. This article primarily introduces an eight-channel 24-bit physiological signal acquisition analog front-end, the GX1298R, whose extremely high integration enables medical devices to achieve more efficient and accurate diagnostic and monitoring functions.

The GX1298R incorporates a programmable gain amplifier (PGA), internal reference, and internal oscillator. Designed for ECG applications, it offers features such as respiration detection, right leg drive, lead disconnection detection, pacemaker detection, and WCT. It can switch between internal clock and internal reference, thereby simplifying ECG peripheral circuits and significantly reducing the size, power consumption, and cost of the application product. Its main features are as follows:

Data rate: 31.25 SPS to 32 kSPS

Programmable gain: 1, 2, 3, 4, 6, 8, or 12

Ultra-low input reference noise: 4.07 μVpp (0.64 μVrms) (BW = 150 Hz, G = 6)

CMRR: 120 dB

Flexible power consumption modes: High-Speed Mode (HS), Low-Power Mode (LP), and Ultra-Low-Power Mode (ULP)

Low Power Mode: Power consumption as low as 410 μW (AVDD = 3 V, DVDD = 1.8 V, ODR = 500 SPS, G = 6)  

Built-in low-drift reference; built-in clock with adjustable frequency and external output capability  

Built-in right leg drive amplifier, lead disconnection detection, temperature sensor, and test signal  

Supports digital pacemaker detection

Adjustable data buffer depth (1/2/4/8/16/32)  

Offset/Gain error calibration function  

Power supply range: Analog power supply: 2.7V to 5.25V; Digital power supply: 1.8V to 5.25V  

Flexible power-off and standby modes  

SPI interface  

Operating temperature range: -40°C to +85°C

In summary, the GXSC physiological signal acquisition analog front-end chip features high integration, low power consumption, low noise, flexible data rate and gain settings, and a wealth of built-in functions, making it a core driver for high-performance medical sensor solutions. In various medical sensor applications such as ECG, EEG, and EMG, it can accurately capture weak bioelectric signals, providing accurate and reliable data support for medical diagnosis and treatment.