12-Channel Factory-Calibrated Configurable Industrial-Analog Input

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)

* 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