GXSC ADC Replaces ADS1296R for Telemedicine Applications

Telemedicine overcomes spatial limitations to achieve efficient connections between patients and medical resources, providing innovative solutions for scenarios such as chronic disease management, postoperative rehabilitation, and emergency care. However, telemedicine heavily relies on the accuracy and reliability of physiological signal acquisition. The GXSC 24-bit ultra-high-resolution analog-to-digital converter is ideally suited for the high-precision signal acquisition core required in telemedicine, with noise performance reaching industry-leading levels, fully meeting the application requirements of telemedicine.

The GXSC analog-to-digital converter features an integrated programmable gain amplifier (PGA), internal reference, and built-in oscillator. It also includes functions such as respiration detection, right leg drive, lead-off detection, pacing detection, and WCT, enabling switching to internal clock and internal reference. This simplifies ECG peripheral circuits, significantly reducing the size, power consumption, and cost of the application product.

Low Noise and High Resolution: The GXSC analog-to-digital converter integrates a low-noise programmable gain amplifier and a 24-bit Σ-Δ ADC for each channel. At a gain of 128, the input-referred noise is as low as 1.2 μV p-p (0.1Hz to 1kHz bandwidth), with an effective number of bits reaching 19. These ultra-high resolution and low-noise characteristics enable precise capture of weak electromyographic signals generated during muscle contraction.

Multi-channel Synchronous Acquisition and Flexible Filtering: The GXSC analog-to-digital converter supports 6-channel synchronous sampling, with a sampling rate adjustable from 15.625 SPS to 32k SPS, catering to diverse EMG application requirements. For static muscle state monitoring, a low sampling rate (500 SPS) is sufficient, while dynamic muscle activity requires a high sampling rate (above 2k SPS) to capture transient signals.

Low Power and Integrated Design: The GXSC analog-to-digital converter consumes only 0.475mW per channel, featuring high common-mode rejection ratio and ultra-low power consumption, making it ideal for wearable devices. With built-in buffering, it can reduce system-level power consumption by over 34%.

The main features of the GXSC analog-to-digital converter 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: 4.07μVpp (0.64μVrms) (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 410µW (AVDD=3V, DVDD=1.8V, ODR=500SPS, G=6)

Built-in low-drift reference; internal clock with adjustable frequency output  • Built-in right-leg drive amplifier, lead-off detection, temperature sensor, and test signal

Supports digital pacing detection

Data cache depth is adjustable (1/2/4/8/16/32)

Offset/Gain error calibration function

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