The ADS1242 and ADS1243 are precision, wide dynamic range, delta-sigma, analog-to-digital (A/D) converters with 24-bit resolution operating from 2.7V to 5.25V supplies. These delta-sigma, A/D converters provide up to 24 bits of no missing code performance and effective resolution of 21 bits.

The 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 Programmable Gain Amplifier (PGA) 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 FIR filter that provides a simultaneous 50Hz and 60Hz notch. The reference input is differential and can be used for ratiometric conversion.

The serial interface is SPI compatible. Up to eight bits of data I/O are also provided that can be used for input or output. The ADS1242 and ADS1243 are designed for high-resolution measurement applications in smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation.

• 24 BITS NO MISSING CODES
• SIMULTANEOUS 50Hz AND 60Hz REJECTION (-90dB MINIMUM)
• 0.0015% INL
• 21 BITS EFFECTIVE RESOLUTION (PGA = 1), 19 BITS (PGA = 128)
• PGA GAINS FROM 1 TO 128
• SINGLE-CYCLE SETTLING
• PROGRAMMABLE DATA OUTPUT RATES
• EXTERNAL DIFFERENTIAL REFERENCE OF 0.1V TO 5V
• ON-CHIP CALIBRATION
• SPI™ COMPATIBLE
• 2.7V TO 5.25V SUPPLY RANGE
• 600µW POWER CONSUMPTION
• UP TO EIGHT INPUT CHANNELS
• UP TO EIGHT DATA I/O
• APPLICATIONS
  • INDUSTRIAL PROCESS CONTROL
  • LIQUID/GAS CHROMATOGRAPHY
  • BLOOD ANALYSIS
  • SMART TRANSMITTERS
  • PORTABLE INSTRUMENTATION
  • WEIGHT SCALES

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