LMP90100MHX/NOPB

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1. Describe

The LMP90100MHX/NOPB is a highly integrated multi-channel low power 24-bit sensor AFE. These devices feature precision 24-bit sigma-delta analog-to-digital converters (ADCs) with low noise programmable gain amplifiers and a fully differential high impedance analog input multiplexer. True continuous background calibration allows calibration at all gains and output data rates without disrupting the signal path. The background calibration function essentially eliminates gain and offset errors over temperature and time, providing measurement accuracy without sacrificing speed and power consumption. Another feature of the LMP90100MHX/NOPB is continuous background sensor diagnostics, which allow detection of open and short conditions and out-of-range signals without user intervention, improving system reliability. Two independent sets of external reference voltage pins allow multiple ratiometric measurements. In addition, the LMP90100/LMP90098 provide two matched programmable current sources for exciting external sensors such as resistance temperature detectors and bridge sensors. Additionally, seven GPIO pins are provided for connecting external LEDs and switches to simplify control across the isolation barrier. Taken together, these features make the LMP90100MHX/NOPB a complete analog front end for low-power, precision sensor applications such as temperature, pressure, strain gage and industrial process control. The LMP90100MHX/NOPB are guaranteed to operate over the extended temperature range of -40°C to +125°C and are available in a 28-pin HTSSOP package with exposed pad.

2. Feature

    1. 24-bit, low-power Sigma-Delta ADC

    2. True continuous background calibration at all gains

    3. In-place system calibration using desired value programming

    4. Low noise programmable gain (1x to 128x)

    5. Continuous background open/short and out-of-range sensor diagnostics

    6. 8 Output Data Rates (ODRs) with Single Cycle Stability

    7. 2 matched excitation current sources from 100 µA to 1000 µA (LMP90100/LMP90098)

    8. 4-DIFF / 7-SE input (LMP90100/LMP90099)

    9. 2-DIFF / 4-SE input (LMP90098/LMP90097)

  10. 7 general purpose input/output pins

  11. Chopper stabilized buffer for low offset

  12. SPI 4/3 lines with CRC data link error detection

  13. 50Hz to 60Hz Line Rejection at ODR ≤13.42 SPS

  14. Independent gain and ODR selection for each channel

  15. Powered by WEBENCH® Sensor AFE Designer

  16. Automatic channel sorter

  17. Key Specifications

        – ENOB/NFR up to 21.5/19 bits

        – Offset error (typ) 8.4 nV

        – Gain error (typ) 7 ppm

        – Total noise < 10 µV-rms

        – Integral nonlinearity (INL max) ± 15 ppm FSR

        – Output Data Rate (ODR) 1.6775 - 214.65 SPS

        – Analog voltage, VA 2.85 to 5.5 V

        – Operating temperature range –40°C to 125°C

        – 28-pin HTSSOP exposed pad

3. Application

    1. Temperature and pressure transmitters

    2. Strain gauge interface

    3. Industrial Process Control

4. Pin configuration

5. Pin Description

6. Application Information

The LMP90100/LMP90099/LMP90098/LMP90097 are highly integrated, multi-channel, low-power 24-bit sensor AFEs. These devices feature a precision 24-bit Sigma Delta analog-to-digital converter (ADC) with low noise programmable gain amplifiers and a fully differential high impedance analog input multiplexer. A true continuous background calibration function allows calibration paths at all gains and output data rates without signal interruption. The background calibration function essentially eliminates gain and offset errors over temperature, time, and measurement accuracy without sacrificing speed and power consumption.