Low Noise 4/6/8 Channel 24-bit ADC Software/Hardware Replacement for AD1299 for EEG Applications

Due to the human body‘s high and highly variable impedance, the EEG signal is very weak, and the external environment has a great deal of interference, so the amplification and pre-processing circuitry part of the EEG signal acquisition system is generally very demanding, and the circuitry is generally more complex, and will generally have a large volume and high power consumption.

GXSC‘s solutions for brainwave (EEG) applications utilize low-noise analog-to-digital converter products that provide high-precision, high-resolution measurements. Our advanced ADCs and amplifiers are critical to achieving accurate and reliable EEG measurements, especially for biometric measurements down to the microvolt level of accuracy.

This GX1299 analog-to-digital converter is a family of multi-channel, low-noise, synchronously sampled 24-bit delta-sigma analog-to-digital converters. With four, six and eight channels respectively, they also feature a built-in programmable gain amplifier (PGA), internal reference and built-in oscillator. Common functions required for EEG and ECG applications are also integrated. The extremely high level of integration significantly reduces product size, power consumption and overall cost. The chip can be configured with a multiplexer to select the signals connected to the main ADC channel, to realize offset test, temperature monitoring, power supply measurement and channel self-test, which makes it easier to monitor the environment in which the chip and the product work.

In addition, the GX1299 configurable multiplexer selects the common mode level of any input channel to generate a bias level signal. The optional SRBPIN pin can be used to connect a common signal to multiple inputs to form a reference montage configuration. Its chip operates at output rates from 250SPS to 64kSPS. It achieves an IRN performance of 1.28μVpp (0.23μVrms) at 250SPS output rate and has a -3dB bandwidth of 14.4kHz at 64kSPS. 

In summary: We offer a full range of discrete and integrated analog front-end (AFE), data conversion and power solutions to help customers design advanced wearable EEG devices.