AD7792BRUZ-REEL

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1. DESCRIPTION

The AD7792BRUZ-REEL are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792BRUZ-REEL contain a low noise 16-/24-bit ∑-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 40 nV when the update rate equals 4.17 Hz. The devices contain a precision low noise, low drift internal band gap reference and can accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator. The bias voltage generator sets the common-mode voltage of a channel to AVDD/2. The devices can be operated with either the internal clock or an external clock. The output data rate from the parts is softwareprogrammable and can be varied from 4.17 Hz to 470 Hz. The parts operate with a power supply from 2.7 V to 5.25 V. They consume a current of 400 μA typical and are housed in a 16-lead TSSOP package. 

2. FEATURES

    1. Up to 23 bits effective resolution

    2. RMS noise

    3. 40 nV @ 4.17 Hz

    4. 85 nV @ 16.7 Hz

    5. Current: 400 μA typical

    6. Power-down: 1 μA maximum

    7. Low noise programmable gain instrumentation amp

    8. Band gap reference with 4 ppm/°C drift typical

    9. Update rate: 4.17 Hz to 470 Hz

  10. 3 differential inputs

  11. Internal clock oscillator

  12. Simultaneous 50 Hz/60 Hz rejection

  13. Programmable current sources

  14. On-chip bias voltage generator

  15. Burnout currents

  16. Power supply: 2.7 V to 5.25 V

  17. –40°C to +105°C temperature range

  18. Independent interface power supply

  19. 16-lead TSSOP package

  20. Interface

        - 3-wire serial

        - SPI®, QSPI™, MICROWIRE™, and DSP compatible

        - Schmitt trigger on SCLK

3. APPLICATIONS

    1. Thermocouple measurements

    2. RTD measurements

    3. Thermistor measurements

    4. Gas analysis

    5. Industrial process control

    6. Instrumentation

    7. Portable instrumentation

    8. Blood analysis

    9. Smart transmitters

  10. Liquid/gas chromatography

  11. 6-digit DVM