TI expands medical AFE line
Ismini Scouras, Contributing editor - April 9, 2012
Texas Instruments Inc has expanded its ADS1298 AFE (analog front end) family with five new fully integrated AFEs for portable biopotential measurement applications.
According to TI, the new ECG (electrocardiogram) and EEG (electroencephalograph) AFEs are the first to offer 16- and 24-bit resolution with 1 or 2 channels. The devices cut power consumption by more than 94 percent compared to discrete implementations, while shrinking board space requirements up to 86 percent, TI said. These reductions will enable portable medical, sports and fitness equipment that combines long battery life with a form factor that is smaller, lighter and easier to wear.
- Reduce board space, system complexity and power consumption: Integrate low-noise PGAs (programmable gain amplifiers), test signals, a right leg drive amplifier, oscillator, voltage reference and lead-off detection function to simplify design, while significantly reducing board space requirements and cutting power consumption to only 335 uW/channel.
- Support AAMI, IEC requirements: Feature input-referred noise below 8 μVpp to support Association for the AAMI (Advancement of Medical Instrumentation) and IEC (International Electrotechnical Commission) end-equipment performance requirements.
- Maximize design reuse: Pin compatible, enabling customers to maximize designs across a family of end products.
Availability and packaging
The new AFEs are all available in a 7×7-mm TQFP package. Pricing in 1,000-unit quantities is as follows:
- 16-bit, 1-channel ADS1191: US$1.50
- 16-bit, 2-channel ADS1192: US$2.50
- 24-bit, 1-channel ADS1291: US$2.00
- 24-bit, 2-channel ADS1292: US$3.50
- 24-bit, 2-channel ADS1292R with respiration impedance: US$4.50