Industrial Configurable Analog I/O

The MAX22000 is an industrial-grade configurable analog input/output device that can be configured on-the-fly in software as a voltage input or output, or current input or output. Additional inputs are available to measure other analog signals.

The device offers an 18-bit DAC with fast settling time as well as a 24-bit delta-sigma ADC. The ADC and DAC can individually choose between an internal or an external reference. The MAX22000 supports the ADC with a low-noise programmable gain amplifier (PGA), with high-voltage and low-voltage input ranges to support RTD and thermocouple measurements. Additional auxiliary inputs are provided to measure cold junction temperatures on-board. The MAX22000 communicates through a high speed 20MHz SPI bus for all configuration and management information as well as for conversion results. An optional 8-bit CRC enhances the reliability of the SPI interface, protecting against all 8-bit bursts and double-bit errors. The MAX22000 operates from 2.7V to 3.6V analog and digital supplies and up to ±24V high-voltage supplies. The device is available in a 64-pin LGA package and operates over the -40°C to +125°C industrial temperature range.Applications

* Distributed Control Systems * Process Control * Programmable Logic Controllers (PLC) * Programmable Automation Controllers (PAC)

* Accuracy

* Analog Output Voltage or Current Mode:

* 0.02%FSR Accuracy, Room Temp

* 0.1%FSR Accuracy, ±50°C Temp Variation

* 5ppm/°C Internal Reference

* Flexibility

* 6 Analog Inputs/1 Analog Output, Software Configurable for Voltage and Current Mode

* Two Auxiliary ADC Inputs for Cold Junction Measurements

* RTD Input Mode in 2, 3, or 4-Wire Configurations

* Thermocouple Input Mode

* ±12.5V Input/Output Voltage Range

* ±25mA or ±2.5mA Output Current Range

* ±25V, ±2.5V, ±500mV, ±250mV, and ±125mV PGA Input Voltage Ranges

* +24V Field Supply for Current Loop

* Optional External Reference for ADC and/or DAC

* Six GPIOs

* 20MHz SPI Interface

* Robustness

* ±36V Protection on All Analog I/O Ports

* Overcurrrent Protection

* Thermal Shutdown

* Undervoltage Interrupt on All High Voltage Supplies

* CRC Detection

* Open Detection on All Analog Inputs

* 1kV HBM Protection on All Pins

* -40°C to +125°C Operating Temperature Range

* 9mm x 9.5mm 64-Pin LGA Package