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TI's 24bit, 8-ch AFE cuts EEG noise by 75%

Posted: 13 Sep 2012     Print Version  Bookmark and Share

Keywords:analogue front end  ADC  electroencephalography  EEG 

Texas Instruments Inc. debuts the 24bit, 8-channel ADS1299 simultaneously sampling electroencephalography (EEG) analogue front end (AFE). The AFE is said to bring down input-referred-noise to as low as 1µVpp, more than 75 per cent lower than alternative EEG AFEs. When used in a 32-electrode EEG, the device claims to cut board space by 70 per cent, and BOM by 40 per cent.

The ADS1299 was designed for extra-cranial bio potential measurement equipment. It can be used in EEG equipment to monitor bi-spectral index, evoked potentials and event-related potentials to diagnose brain injuries, strokes and sleep disorders. It can also be used in ultra-high-performance medical diagnostic and research-grade electrocardiogram (ECG) equipment.

The AFE integrates eight low-noise programmable gain amplifiers, eight high-resolution ADCs, test signals, bias amplifier, oscillator and reference. It achieves input-referred noise as low as 1µVpp at 70Hz bandwidth and a common mode rejection ratio of -120dB, even in the presence of large EMI signals. It also offers continuous lead-off detection option that notifies medical staff when electrodes disconnect.

The device is 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.

TI also offers the ADS1299 Performance Demonstration Kit (ADS1299EEG-FE) which 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.

The ADS1299 EEG AFE is available in a 10mm x10mm QFP package for Rs.2,000 ($36) in 1,000-unit quantities.

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