EEG AFE from TI for non-invasive brain wave monitoring

When used in a 32-electrode EEG, the device also reduces board space by 70 percent while reducing bill of materials 40 percent.

The ADS1299 was designed for manufacturers of extra-cranial biopotential measurement equipment who want to reduce board space, design time and cost while improving performance. It can be used in EEG equipment to monitor bispectral index, evoked potentials and event-related potentials to diagnose brain injuries, strokes and sleep disorders. The ADS1299 can also be used in ultra-high-performance medical diagnostic and research-grade electrocardiogram equipment.

Key features and benefits of the ADS1299:

•Reduces board space, BOM cost:
oIntegrates eight low-noise programmable gain amplifiers, eight high-resolution analog-to-digital converters, test signals, bias amplifier, oscillator and reference.
oWhen used in a 32-electrode EEG, the ADS1299 significantly reduces board space and BOM compared to alternative EEG AFEs, which provide fewer channels and require additional external components to reduce noise.

•Highest performance available: With input-referred noise as low as 1 uVpp at 70-Hz bandwidth and a common mode rejection ratio of -120 dB, 10-dB better than the competition, the ADS1299 enables extra-cranial biopotential measurement, even in the presence of large electromagnetic interference signals.

•Increases equipment reliability: Continuous lead-off detection option notifies medical staff when electrodes disconnect.

•Pin-compatible to reduce design costs, decrease time to market: Pin compatible with the following devices in the ADS1298 family: eight-channel ADS1298, ADS1298R and ADS1198; six-channel ADS1296, ADS1296R and ADS1196; four-channel ADS1294, ADS1294R and ADS1194. This enables medical equipment manufacturers to design complete lines of products with one EEG/ECG device family, reducing overall design costs and significantly decreasing time to market.

Tools and support
The ADS1299 Performance Demonstration Kit (ADS1299EEG-FE) includes easy-to-use evaluation software; built-in analysis tools, including oscilloscope, FFT and histogram displays; flexible input configurations; optional external reference circuits; and the ability to export data in simple test files for post processing. An IBIS model to verify board signal integrity requirements is also available.

Availability and packaging
The ADS1299 is available today in a 10-mm by 10-mm QFP package for $US36 in 1,000-unit quantities.