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EEG AFE flaunts industry's lowest noise at 1uVpp

Posted: 12 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:ADS1299? ADS1298? EEG AFE? electroencephalography? ADC?

Texas Instruments Inc. has added another product to its ADS1298 analog front end (AFE) family that touts the industry's lowest-noise electroencephalography (EEG) AFE, enabling non-invasive monitoring of brain waves. According to the company, the 24bit, 8-channel ADS1299 is the first simultaneously sampling EEG AFE with input-referred-noise as low as 1uVpp, more than 75 percent lower than the alternative EEG AFEs. When used in a 32-electrode EEG, the device also cuts PCB space by 70 percent while reducing BOM by 40 percent, TI added.

The ADS1299 can be used in EEG equipment to monitor bispectral 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 device integrates eight low-noise programmable gain amplifiers, eight high-resolution analog-to-digital converters (ADCs), test signals, bias amplifier, oscillator and reference. With input-referred noise as low as 1uVpp at 70Hz bandwidth and a common mode rejection ratio of -120dB, 10dB better than the competition, the ADS1299 enables extra-cranial biopotential measurement, even in the presence of large electromagnetic interference signals, detailed the company.

The EEG AFE features continuous lead-off detection option that notifies medical staff when electrodes disconnect. It is likewise 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.

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.

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

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