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TI ADC fits portable instrumentation, medical apps

Posted: 13 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? ads1244? burr brown? adc? analog digital converter?

The ADS1244 24-bit delta-sigma ADC from Texas Instruments Inc. draws 90?A and is available in an MSOP-10 casing, making it suitable for use in high-resolution measurements in handheld instrumentation, portable medical equipment, industrial process control, and weighing scales.

A part of the company's Burr-Brown product line, the ADC consists of a third-order delta-sigma modulator and digital filter. The analog modulator has a 5V differential input stage. The digital filter rejects both 50Hz and 60Hz signals, completely settles in one cycle and outputs data at 15Sa/s.

The ADS1244 is designed to easily connect to microcontrollers, such as the company's MSP430 family of microcontrollers, to offer a complete data acquisition solution. Multiple ADS1244s can be connected together to create a synchronously sampling multichannel measurement system.

A two-wire serial interface provides all the necessary control. Data retrieval, self-calibration, and Sleep Mode are handled with a few simple waveforms. When only single conversions are needed, the Sleep Mode can be used to shut down the ADS1244 when idle between measurement, Power is typically <270?W in normal operation and l<1?W in Sleep Mode. Ithe device supports 2.5V to 5.25V analog supplies and 1.8V to 3.6V digital supplies.

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