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.
- 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
- Analog Output Voltage or Current Mode:
- 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
- Distributed Control Systems
- Process Control
- Programmable Logic Controllers (PLC)
- Programmable Automation Controllers (PAC)
19-100526; Rev 3; 3/22