EEG analog front end lowers noise more than 75 percent for non-invasive brain wave monitoring

September 11, 2012 // By Paul Buckley
Texas Instruments Incorporated has expanded the company’s ADS1298 analog front end (AFE) family with the industry's lowest-noise electroencephalography (EEG) AFE, enabling non-invasive monitoring of brain waves.

The 24-bit, 8-channel ADS1299 is the first simultaneously sampling EEG AFE with input-referred-noise as low as 1 uVpp, more than 75-percent lower than the alternative EEG AFEs. When used in a 32-electrode EEG, the device also reduces board space by 70 percent while reducing bill of materials (BOM) 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 (ECG) equipment.

The 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.

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 Pricing

The ADS1299 is available today in a 10-mm by 10-mm QFP package for $36 in 1,000-unit quantities.

More information about the ADS1299 analog front end at
www.ti.com/ads1299-pr