Six channel 24 bit analog front-end GX1296R software and hardware replacement ADS1296R for electromyography (EMG) application

When muscles contract, a weak current is generated. Attaching electrodes at appropriate positions on the skin can measure the current in the muscles on the surface of the body. Electromyography is a curve of current intensity over time, and electronic instruments are used to record the bioelectric signals of muscles during rest or contraction. The six channel 24 bit physiological electrical acquisition analog front-end chip GX1296R of GXSC is designed specifically for biological potential measurement. The GX1296R chip has low noise performance, high common mode rejection ratio, and flexible signal conditioning capability, making it a high-quality choice for electromyography (EMG) solutions.

Low noise and high resolution: The GX1296R integrates a low-noise programmable gain amplifier and a 24 bit ∑ - Δ analog-to-digital converter in each channel. With a gain of 128 times, the input reference noise is as low as 1.2 μ V peak to peak (0.1Hz to 1kHz bandwidth), and the effective bit count is as high as 19 bits. This ultra-high resolution and low noise feature can accurately capture the weak electromyographic signals generated during muscle contraction.

Multi channel synchronous acquisition and flexible filtering: GX1296R supports 6-channel synchronous sampling, and the sampling rate can be adjusted within the range of 15.625SPS to 32kSPS to meet the needs of different EMG applications. Static muscle state monitoring can use a low sampling rate (500SPS), while dynamic muscle activity requires a high sampling rate (above 2kSPS) to capture transient signals.

Low power consumption and integrated design: The GX1296R has a power consumption of only 0.475mW per channel, high common mode rejection ratio, extremely low power consumption, suitable for wearable devices, supports caching, and can reduce system level power consumption by 34%+.

The main features of GX1296R are as follows:

Data rate: 31.25SPS to 32kSPS

• 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