概览

优势和特点

  • Enables More Robust and Reliable Systems
    • ±36V High-Voltage Protection for All Input Ports
    • 2kV HBM ESD Protection of All Pins
    • ±2kV Surge Protection (with External 5kΩ Resistor)
    • CRC Detection for Robust Serial Communication
    • Watchdog Timer
  • Software Configurability
    • ±12.5V Analog Input-Voltage Mode
    • ±25mA Analog Input-Current Mode Using External Sense Resistor
    • Configurable Inputs Using External Sense Resistor and Low-Cost Switches
  • Best-in-Class System Accuracy
    • 0.02% FSR at 25°C Factory Calibrated
    • 0.05% FSR over ±50°C from 25°C Factory Calibration
    • Maximum of 30nA Input Leakage
    • 5ppm/°C Internal Reference
  • Additional Features
    • Internal or External ADC Reference
    • Eight GPIO Ports
    • 48.5mW Low Power Dissipation with ±5V Supply
    • 30MHz SPI/QSPI/DSP-Compatible Serial Interface
  • Operating Temperature -40°C to +125°C
  • 7.5mm × 7mm 48-pin LGA package

产品详情

The MAX22005 is a twelve-channel industrial-grade analog input voltage-mode device that can also be configured as analog-input current-mode device using an external precision resistor per channel. It can also operate as configurable analog-input using an external precision resistor and low-cost switch per channel. Input channels can be used as twelve single-ended inputs, or six differential inputs, or up to eight multichannel configurable differential inputs. In total, the device supports up to 26 different configurations

The MAX22005 features an integrated 24-bit delta-sigma ADC that is shared between all channels. The ADC can be used with either an integrated 5ppm/°C precision reference or an external reference. Standard industrial analog input voltage ranges are converted to the ADC input voltage range using high-voltage, zero-drift input amplifiers. All input ports are robustly protected up to ±36V reverse polarity and ±1.5kV surge pulses without the need of TVS diodes.

Eight general-purpose digital I/O (GPIO) ports are available for common use, or they can be used to control external switches for configurable inputs.

The MAX22005 is factory calibrated with best-in-class system performance of less than 0.05% FSR Total-Unadjusted-Error (TUE) over temperature.

The host communicates with the MAX22005 through a high-speed 30MHz SPI bus for all configurations and information management, as well as for acquiring conversion results. An optional 8-bit CRC enhances the reliability of the SPI interface, protecting against all 8-bit bursts, as well as all double-bit errors.

The MAX22005 operates from 2.7V to 3.6V analog and digital supplies, and up to ±24V high-voltage supplies.

The MAX22005 is available in 48-pin LGA package and operates over the -40°C to +125°C industrial temperature range.

Applications

  • Programmable Logic Controllers (PLC)
  • Programmable Automation Controllers (PAC)
  • Distributed Control Systems (DCS)

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