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TI ADS1293CISQ Low-Power 3-Channel 24-Bit Analog Front-End For Biopotential Measurements

Shenzhen Mingjiada Electronics Co., Ltd., as a globally renowned authorised independent distributor of electronic components, specialises in supplying TI's ADS1293CISQ low-power 3-channel 24-bit analog front end solution, specifically designed for bioelectric potential measurement.

ADS1293CISQ Product Overview:

The ADS1293CISQ is a low-power, 3-channel, 24-bit Δ-Σ-type analogue front-end (AFE) chip optimised for bioelectric potential measurement. The device integrates key functional modules such as a programmable gain amplifier (PGA), high-precision ADC, and right-leg drive (RLD), making it particularly suitable for the acquisition and processing of bioelectric signals such as electrocardiograms (ECG), electroencephalograms (EEG), and electromyograms (EMG).

The ADS1293CISQ integrates a range of essential features commonly found in portable, low-power medical, sports, and fitness ECG applications. With its high level of integration and exceptional performance, the ADS1293CISQ enables scalable medical instrument system designs with significantly reduced size, lower power consumption, and overall cost.

The ADS1293CISQ features three high-resolution channels supporting a maximum sampling rate of 25.6 ksps. Each channel can be independently configured for sampling rate and bandwidth, allowing users to optimise settings based on performance and power consumption requirements. All input pins include built-in electromagnetic interference (EMI) filters and can route signals to any channel via flexible switching. The flexible switching functionality also supports independent lead disconnection detection, right leg drive, and Wilson/Goldberger reference electrode generation without the need for external lead reconnections. The fourth channel can be used for external analogue pacing detection, suitable for applications that do not utilise digital pacing detection.

The ADS1293CISQ includes a built-in self-diagnostic alarm system that detects whether the system is operating outside its specified conditions. Such events are reported to an error flag bit. The overall status of the error flag bit can be output as a signal via the dedicated ALARMB pin.

Core technical features of the ADS1293CISQ:

Ultra-low power consumption design

The ADS1293CISQ employs TI's advanced low-power process technology and intelligent power management architecture, achieving power consumption as low as 150μA per channel in 3-channel full-open mode and standby current as low as 1μA. This feature makes it an ideal choice for portable and wearable medical monitoring devices. The ADS1293CISQ chip supports multi-level power consumption mode switching, allowing users to flexibly adjust the operating state according to the application scenario, significantly extending the battery life of battery-powered devices.

High-precision signal chain integration

The ADS1293CISQ device incorporates three independent 24-bit Δ-Σ ADCs, offering a signal-to-noise ratio (SNR) of up to 120 dB and an input reference noise of ±0.5 μV, enabling accurate capture of microvolt-level changes in bioelectric signals. Each channel is equipped with a programmable gain amplifier (PGA) with a gain range adjustable from 1 to 12, accommodating input signals of varying amplitudes. The integrated high-precision right-leg drive circuit (RLD) effectively suppresses common-mode interference, improving signal quality in complex electromagnetic environments typical of medical settings.

Flexible Interfaces and Configuration

The ADS1293CISQ offers an SPI-compatible interface for easy connection to various microcontrollers, supporting communication rates up to 20 MHz. The ADS1293CISQ device integrates a temperature sensor and lead disconnection detection functionality, further simplifying system design. Through register configuration, users can flexibly set the sampling rate (125 SPS to 8 kSPS), filter characteristics, and operating mode to meet the diverse requirements of different medical applications for signal bandwidth and resolution.

Medical-grade reliability and packaging

As a dedicated medical electronics chip, the ADS1293CISQ complies with medical device electromagnetic compatibility (EMC) requirements and uses a 4mm × 4mm WQFN package (CISQ suffix), suitable for space-constrained portable designs. The ADS1293CISQ operates within a temperature range of -40°C to +85°C, ensuring stable performance under various environmental conditions and meeting the stringent reliability requirements of medical devices.

Typical applications of the ADS1293CISQ

Clinical-grade electrocardiogram (ECG) monitoring devices

In static ECG machines and dynamic Holter monitors, the ADS1293CISQ's 3-channel architecture perfectly supports standard I, II, and III lead configurations. Its 24-bit resolution and built-in RLD circuit effectively suppress 50/60Hz power line interference, ensuring clinical-grade ECG waveform quality.

Portable and wearable health monitoring devices

For increasingly popular wearable devices such as smart bracelets and chest-mounted monitors, the ADS1293CISQ's ultra-low power consumption and small package size offer unique advantages.

Professional electroencephalography (EEG) and electromyography (EMG) devices

In the fields of neurophysiological research and rehabilitation medicine, the ADS1293CISQ's high input impedance (>1 GΩ) and low noise characteristics enable it to accurately capture weak EEG and EMG signals.

Telemedicine and home health monitoring

When combined with Bluetooth or Wi-Fi wireless transmission modules, devices based on the ADS1293CISQ can enable cloud-based ECG monitoring, supporting remote diagnosis by doctors and alerts for abnormal heart rhythms.