24 bit GX1291 100% replacement for ADS1291 applied to pet electrocardiogram detector

Pet electrocardiogram monitor is a medical device used to monitor the electrocardiogram activity of pets and assist in the diagnosis and treatment of heart diseases. As a key means of evaluating the heart health status of pets, electrocardiogram detection can timely detect potential heart disease hazards. High precision analog-to-digital conversion is the basis for obtaining reliable electrocardiogram data. The GX1291 high-performance bioelectric acquisition simulation front-end can improve the accuracy of electrocardiogram detection, achieve multi parameter synchronous monitoring, and have advantages such as reducing detection costs.

GX1291 is designed specifically for biological potential measurement, with 100% replacement of ADS1291 in software and hardware. It has a 24 bit resolution and can finely quantify weak electrocardiogram signals of pets. At the same time, it adopts advanced low-noise design, with internally integrated programmable gain amplifier (PGA) and digital filter, which can effectively suppress noise interference.

For battery application scenarios, GX1291 provides ULP mode, greatly improving battery life. Its data caching function can reduce the number of MCU interrupts and help save system power consumption. So choosing GX1291 can significantly reduce the size, power consumption, and cost of application products. And it has lead detection function based on excitation current trap/current source, with a current range of 6nA~399nA, which can be selected and adjusted according to product requirements.

In addition, the output data rate of GX1291 is as high as 32kSPS, which enables digital pacing detection. It has very low input reference noise during operation, and at GAIN=12, the input reference noise can be as low as 0.20 µ Vrms (1.24 µ Vpp). The common mode rejection ratio (CMRR) is not less than 120dB in unit gain mode. In addition, the chip still has an SNR of 87dB at an output rate of 32kSPS, demonstrating excellent performance.

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

Ultra low input reference noise: 4.07 μ Vpp (0.64 μ Vrms) (BW=150Hz, G=6)

• CMRR：120dB

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

Low power mode, with a power consumption of only 410 µ W (AVDD=3V, DVDD=1.8V, ODR=500SPS, G=6)

• Built in low-temperature float benchmark; Built in clock, capable of external output, and adjustable frequency

• Built in right leg driver amplifier, lead detachment detection, temperature sensor, test signal

• Supports digital pacing detection

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

Offset/Main 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