ADS1232IPWR

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1. Description

The ADS1232IPWR are precision, 24-bit, analog-to-digital converters (ADCs). With a low-noise programmable gain amplifier (PGA), a precision delta-sigma ADC, and internal oscillator, the ADS1232IPWR provide a complete front-end solution for bridge sensor applications including weigh scales, strain gauges, and pressure sensors. An input multiplexer (MUX) accepts either two or four differential inputs. The ADS1232IPWR also includes a temperature sensor to monitor ambient temperature. The low-noise PGA has a selectable gain of 1, 2, 64, or 128, supporting a fullscale differential input of ±2.5 V, ±1.25 V, ±39 mV, or ±19.5 mV. The delta-sigma ADC provides a maximum of 23.5- bits effective resolution, and supports two data rates: 10 SPS (providing 50-Hz and 60-Hz rejection) and 80 SPS. The ADS123x can be clocked externally using an oscillator or a crystal, or by the internal oscillator. Offset calibration is performed on-demand, and the ADS1232IPWR can be put in a low-power standby mode or shut off completely in power-down mode. The ADS1232IPWR are operated through simple pin-driven control—there are no digital registers to program. Data are output over a two-wire serial interface that connects directly to the MSP430 and other microcontrollers.

2. Features

    1. Complete front-end for bridge sensors

    2. 23.5-bits effective resolution at gain = 1

    3. 19.2-bits noise-free resolution at gain = 64

    4. Low-noise PGA

    5. Selectable gains of 1, 2, 64, and 128

    6. RMS noise: 

        – 17 nV at 10 SPS at gain = 128

        – 44 nV at 80 SPS at gain = 128

    7. 100-dB simultaneous 50-Hz and 60-Hz rejection

    8. Flexible clocking:

        – Low-drift internal oscillator

        – Optional external crystal

    9. Selectable 10-SPS or 80-SPS data rates

  10. Easy ratiometric measurements:

        – External voltage reference up to 5 V

  11. Two-channel differential input with internal temperature sensor (ADS1232)

  12. Four-channel differential input (ADS1234)

  13. Two-wire serial interface

  14. Supply voltage range: 2.7 V to 5.3 V

  15. Temperature range: –40°C to +105°C

  16. Packages: TSSOP-24 (ADS1232) or TSSOP-28 (ADS1234)

3. Applications

    1. Weigh scales

    2. PLC weight modules

    3. Pressure sensors