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Industry's First 24-Bit Data Converter with On-Chip Flash Memory from TI Simplifies Design of Low-Power, Precision Measurement Applications
Data Conversion System Reduces Component Count and Overall System Cost
TUCSON, Ariz. (Sept. 28, 2001) -- Featuring unparalleled analog performance and integration for high-resolution measurement applications, Texas Instruments (TI) (NYSE: TXN) announced the industry's first 24-bit analog-to-digital converter (ADC) with on-chip flash memory from the company's Burr-Brown product line. The device is the latest generation of high-performance data conversion systems from TI designed for industrial process control, portable instrumentation, and test and measurement applications such as weigh scales, temperature measurement, liquid/gas chromatography, smart transmitters, and pressure transducers. See http://www.ti.com/sc/aap6884u.
The ADS1218 features 4K bytes of on-chip flash memory which is programmable over the entire 2.7V to 5.25V operating range. Flash memory offers the user increased levels of customization by allowing key configurable functions such as linearization, serialization, calibration, and data storage.
Optimized for high-performance, low-power systems, the ADS1218 offers 24 bits of no missing code performance, effective resolution of 22 bits, and less than 1mW power consumption. The precision on-chip voltage reference is accurate to within 0.2 percent and has very low drift (typically 5ppm/C). Also, linearity error is guaranteed to be less than +/-0.0015 percent of full-scale.
"The ADS1218 greatly simplifies the design of complex mixed-signal systems by solving designers' integration challenges. By combining such a high level of electronic circuitry on a small chip, TI has reduced the need for external circuitry that costs significantly more than the single-chip system solution provided by the ADS1218," said Robert Schreiber, strategic marketing engineer of TI's Data Acquisition Products. "Furthermore, TI's solution costs two to four times less than competitors' offerings which fall short in terms of overall performance and integration."
In addition to on-chip flash memory, the 24-bit ADS1218 integrates an eight-channel multiplexer, programmable gain amplifier (PGA), input buffer, on-chip temperature sensor, burn-out current sources, dual independent current DACs, on-chip voltage references, external differential reference inputs, selectable data output rate, offset DAC, and eight programmable digital I/O.
The multiplexer front-end supports eight input channels, which can be configured as differential pairs in any combination. This allows the connection and conversion of up to eight separate inputs. Burn-out current sources allow for detection of an open or shorted sensor. The selectable buffer provides a high impedance input for direct connection to transducers or low-level voltage signals.
The device's PGA provides for gains of up to 128. Analog-to-digital conversion is accomplished with a second-order modulation and a fully-programmable sinc filter. The settling time and noise is programmable through filter control bits. The on-board current DACs (digital-to-analog converters) operate independently with the maximum current set by an external resistor.
The ADS1218 includes eight programmable digital I/O that can be used for input or output -- allowing easy isolation between the processor and the input measurement and control. The serial interface is SPI compatible.
Available Today
The ADS1218 is available today in a 48-pin TQFP surface-mount package. Suggested resale pricing starts at $8.75 in 1,000 piece quantities.
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