Four channel 24 bit analog front-end GX1294 benchmarking ADS1294 applied to home blood pressure monitors

Home blood pressure monitors have the characteristics of low cost, miniaturization, and automation, and users can use their leisure time to conduct physical examinations for themselves. The new household electronic blood pressure monitor can achieve wireless transmission of measurement data, record various blood pressure parameter values, display historical measurement records, allowing users to timely understand their physical condition and take early prevention and treatment measures.

Home blood pressure monitors need to collect bioelectric signals such as human pulse waves and electrocardiogram (ECG), and then calculate systolic blood pressure, diastolic blood pressure, and heart rate. The core component of home blood pressure monitors, the analog front-end chip for physiological electrical acquisition, needs to ensure high-precision measurement to avoid misleading health judgments due to measurement deviations. The four channel 24 bit analog front-end GX1294 of GXSC has the characteristics of high precision, low noise, high common mode rejection ratio, low power consumption design, and integrated bioelectric dedicated functions. It can effectively replace ADS1294 for home blood pressure monitors, meeting the needs of home users for "precision, durability, and convenience" of blood pressure monitors.

The GX1294 is equipped with a programmable gain amplifier (PGA), internal reference, and built-in oscillator. It also integrates common functions required for EEG and ECG applications. The extremely high integration level of the chip can significantly reduce product size, power consumption, and overall cost.

GX1294 operates at an output rate of 250SPS~64kSPS. At an output rate of 250SPS, it can achieve an IRN performance of 1.28 μ Vpp (0.23 μ Vrms); At 64kSPS, it has a -3dB bandwidth of 14.4kHz. GX1294 is equipped with pull-up/pull-down resistors, excitation current traps/sources, and AC lead detection functions. In addition, GX1294 has a daisy chain configuration, which can solve the problem of cascading data in high channel systems. The digital cache function with a maximum depth of 16 can minimize the frequency of data retrieval, thereby reducing system power consumption.

Introduction to the main features of GX1294:

Input reference noise: 1.28yVpp (0.23uVrms); (BW=70Hz,G=24)

Data rate: 250SPS to 64kSPS

Common mode rejection ratio (CMRR): -118dB

Programmable gains: 1, 2, 3, 4, 6, 8, 12, 24

Single pole power supply, analog power supply: 2.75V to 5.25V; digital power supply: 1.8V to 3.6V

Built in or external reference, built-in or external clock, internal clock can output

Built in bias amplifier, lead dropout detection, temperature sensor

Test signal and power measurement functions

Supports up to 16 depth digital cache function

Flexible power-off and standby modes

SPI interface, supports daisy chain

Excellent ESD capability, HBM：+8000V； CDM：±1500V；Latch-Up：600mA

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