ADS1231ID

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1. Describe

The ADS1231 is a precision 24-bit analog-to-digital converter (ADC). Featuring an onboard low noise amplifier, onboard oscillator, precision third-order 24-bit delta-sigma (ΔΣ) modulator, and bridge power switch, the ADS1231 provides a complete Front-end solutions, and load cells. The LNA gain is 128, supporting ±19.5mV full-scale differential input. The ΔΣ ADC has 24-bit resolution and consists of a third-order modulator and a fourth-order digital filter. Two data rates are supported: 10SPS (with both 50Hz and 60Hz rejection) and 80SPS. The ADS1231 can enter a low-power standby mode or shut down completely in power-down mode. The ADS1231 is controlled by dedicated pins; there are no digital registers available for programming. Data is output via an easily isolated serial interface that connects directly to the MSP430 and other microcontrollers. The ADS1231 is available in an SO-16 package and Specified from –40°C to +85°C.

2. Feature

    1. Complete front end for bridge sensors

    2. Internal amplifier with gain of 128

    3. Internal oscillator

    4. Low-side power switch for bridge sensors

    5. Low noise: 35nVrms

    6. Selectable data rate: 10SPS or 80SPS

    7. Simultaneous rejection of 50Hz and 60Hz at 10SPS

    8. Input EMI filter

    9. External reference voltage up to 5V for ratiometric measurements

  10. Simple pin drive control

  11. Two-wire serial digital interface

  12. Power supply range: 3V to 5.3V

  13. Package: SOIC-16

  14. Temperature range: –40°C to +85°C

3. Application

    1. weighing scale

    2. Strain gauges

    3. Load cell

    4. Industrial Process Control

4. Pin configuration

5. Pin Description