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( File format: PDF, 730 KB )
8-Channel, 24-Bit, Analog-to-Digital Converter with FLASH Memory (Rev. C)
Texas Instruments

Description
The ADS1218 is a precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converter with 24-bit resolution and Flash memory operating from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to 24 bits of no missing code performance and effective resolution of 22 bits. The eight input channels are multiplexed. Internal buffering can be selected to provide a very high input impedance for direct connection to transducers or low-level voltage signals. Burnout current sources are provided that allow for the detection of an open or shorted sensor. An 8-bit Digital-to-Analog (D/A) converter provides an offset correction with a range of 50% of the FSR (Full-Scale Range). The PGA (Programmable Gain Amplifier) provides selectable gains of 1 to 128 with an effective resolution of 19 bits at a gain of 128. The A/D conversion is accomplished with a second-order delta-sigma modulator and programmable sinc filter. The reference input is differential and can be used for ratiometric conversion. The on-board current DACs (Digital-to-Analog Converters) operate independently with the maximum current set by an external resistor. The serial interface is SPI-compatible. Eight bits of digital I/O are also provided that can be used for input or output. The ADS1218 is designed for high-resolution measurement applications in smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation.
Features
24 BITS NO MISSING CODES 0.0015% INL 22 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128) 4K BYTES OF FLASH MEMORY PROGRAMMABLE FROM 2.7V TO 5.25V PGA FROM 1 TO 128 SINGLE CYCLE SETTLING MODE PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz PRECISION ON-CHIP 1.25V/2.5V REFERENCE: ACCURACY: 0.2% DRIFT: 5ppm/C EXTERNAL DIFFERENTIAL REFERENCE OF 0.1V TO 2.5V ON-CHIP CALIBRATION PIN-COMPATIBLE WITH ADS1216 SPI? COMPATIBLE 2.7V TO 5.25V < 1mW POWER CONSUMPTION APPLICATIONS INDUSTRIAL PROCESS CONTROL LIQUID/GAS CHROMATOGRAPHY BLOOD ANALYSIS SMART TRANSMITTERS PORTABLE INSTRUMENTATION WEIGHT SCALES PRESSURE TRANSDUCERS SPI is a trademark of Motorola. All trademarks are the property of their respective owners.

Related Datasheets
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? ?ADS1216 8-Channel, 24-Bit Analog-to-Digital Converter (Rev. D) Cards and Modules
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