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( File format: PDF, 599 KB )
8-Channel, 24-Bit Analog-To-Digital Converter (Rev. C)
Texas Instruments

Description
The ADS1217 is a precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converter with 24-bit resolution 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 Converter (DAC) 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 2nd-order delta-sigma modulator and programmable sinc filter. The reference input is differential and can be used for ratiometric cancellation. The onboard current DACs 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 ADS1217 is designed for high-resolution measurement applications in smart transmitters, industrial process control, weigh scales, chromatography, and portable instrumentation.
Features
24 BITS NO MISSING CODES INL: 0.0012% of FSR max FULL-SCALE INPUT = 2VREF PGA FROM 1 TO 128 22 BITS EFFECTIVE RESOLUTION (PGA =1), 19 BITS (PGA = 128) SINGLE CYCLE SETTLING MODE PROGRAMMABLE DATA OUTPUT RATES UP TO 1kHz ON-CHIP 1.25V/2.5V REFERENCE ON-CHIP CALIBRATION SPI COMPATIBLE POWER SUPPLY: 2.7V to 5.25V < 1mW POWER CONSUMPTION, VDD = 3V APPLICATIONS INDUSTRIAL PROCESS CONTROL LIQUID/GAS CHROMATOGRAPHY BLOOD ANALYSIS SMART TRANSMITTERS PORTABLE INSTRUMENTATION WEIGH SCALES PRESSURE TRANSDUCERS All trademarks are the property of their respective owners.

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